Key to the Laphria of Arkansas and the East


 

This key was created by modifying the key to the Laphria that appears in the 1975 paper "A Taxonomic Study of the Asilidae of Michigan" by Norman T. Baker and Roland L. Fischer. Species that do not occur here were removed and species that possibly occur here or in adjacent states were worked in by characteristics. Several large species appear at the initial added portion. Some of the redescriptions from Bullington's Laphria page were helpful in placing some of the non-Michigan species and for characters in some of the larger robbers. Links from the species names are to Bullington's redescriptions. 

 

1  Fly with prominent death’s head pattern of dark on the dorsal thorax; orange waspy insect of the pine forests and coastal plain

                                                                           saffrana

1’ Fly without above pattern

                                                                                        2

 

2  Large flies, 24 mm or more in length

                                                                          3

2’ Smaller flies, many less than 20mm

                                                                           7

 

3  Visible dorsum of all abdominal tergites except 5 entirely bare, some hairs present along extreme lateral margins of all tergites; in the male all of these lateral hairs are black; in the female some of the hairs on tergites 1-2 are yellow.

                                 apila

3’ Dorsum of some or all tergites other than 5 with hair

                                                 4

 

4  Tufts of hair in front of wings entirely pale

                                                                                                                    4.5

4’ Tufts of hair in front of wings black or mostly black

                                                  5

 

4.5 Abdominal tergite 6 covered with red hair in female

fattigi

4.5' Abdominal tergite 6 yellow haired as well as 4 and 5

vorax

 

5  Entire length of dorsal half of each mid-tibia with extremely conspicuous yellow hairs

                                                                                                                          macquarti

5’ Mid-tibias black

                                                                                                      6

 

6  Light hairs very dirty yellow to brownish yellow; tufts of hair in front of halteres with some black; very large to huge(27-39 mm long)

                                                                                 lata

6’ Light hairs bright to dull yellow ; tufts of hair in front of halteres entirely dull yellow; large to huge (23-35 mm long)

                                                                                                 grossa

 

7  Abdomen always with considerable amounts of erect long black pile; pile of mesonotum always dense and erect; abdomen broadened beyond middle and generally ovate in males

                                                                                                                             8

7’ Abdomen devoid of pile or with yellow or golden pile and very little or no black pile, frequently appressed; mesonotum naked or with more or less appressed pile; abdomen almost always nearly parallel sided in males

                                                                                          22

 

8  Hair on sides of first abdominal segment largely black

                                                  9

8’ Hair on sides of first abdominal segment largely yellow

                                               17

 

9 Front and middle legs and joint of metafemora and tibiae densely covered with yellow hair or fore and mid-tibia yellow haired or midtibia only yellow haired

                                                                                 10

9’Legs largely black-haired or profemora alone with dense yellow hair

                           12

 

10  Beard entirely yellow or eye margin black and rest yellow

                                        11

10’ Beard black top third, yellow lower 2/3

                                                             flavicollis (male)

 

11 Tuft of hairs in front of halteres mostly yellow

                                                      virginica (male)

11’Tuft of hairs in front of halteres black

                                                                      affinis

 

12  Beard entirely black or nearly so

                                                                             13

12’ Beard entirely yellow or yellow except lower margin black continuous with eye line

     15

 

13  Mystax entirely yellow

                                                                                            20

13’ Mystax all or largely black

                                                                                       14

 

14  Lateral of tergite 2 and dorsum of tergites 3 and 4 always yellow

                           nigella

14’ Abdomen usually all black but sometimes with some yellow on 2, 3, 4

                 thoracica

 

15 Marginal scutellar bristles largely pale; disc of scutellum with black hair or entirely yellow hair

                                                                                                                                 20

15’ Scutellar bristles and hair largely black

                                                                    16

 

16  Abdominal tergites 4 and 5 yellow; mesonotum entirely covered with long yellow hairs, two thirds of which are recumbent

                                                                        posticata

16’ Abdominal tergites 4 and 5 black; mesonotum with pile appearing bright yellow from a distance, equal numbers of hairs erect or recumbent.

                                                                        virginica (female)

 

17  Scutellar vestiture black; black hairs far outnumber any lateral yellow hairs; pile of tergite 6 grayish to pale yellow

                                  18

17’ Scutellar vestiture yellow, sometimes central smaller hairs black and lateral large hairs yellow

                                                                                          19

 

18 Pile of tergite 6 grayish to pale yellow; tergites 1-4 with short black hairs; 10-16 mm insect

                                          cinerea

18’Pile of tergite 6 black (as well as 5 and 7); tergites 1-4 yellow haired; over 22 mm long

                                   macquarti

 

19  Pile of tergite 6 always black; dorsal abdominal pile of first three tergites black; tergites 2-7 entirely black haired

                 flavicollis 

19’ Pile of tergite 6 all yellow; tergites 4 and 5 entirely covered with yellow hair

                                                                                        vorax

19’' Pile of tergite 6 black; tergites 1-3 in both sexes long yellow haired as well as part of 4, the rest black

sacrator

 

20  Dorsum of abdomen with entirely black pile

                                                           flavicollis

20’ Dorsum of abdomen with black and yellow pile

                                                        21

 

21  Pronotal bristles black; hairs on disc of scutellum conspicuous and yellow

                                                                                          divisor

21’ Pronotal bristles yellow; hairs on scutellum black and slanted 45 degrees back

                                                                                       posticata

 

22  Abdominal tergites largely covered with reddish or yellowish pile

                               23

22’ Abdominal tergites nearly bare except for more or less dense hair laterally or with only scattered fine whitish or yellowish pile on anterior margins (canis complex)

                                       27

 

23  Femora and tibiae rather bright red-orange on all legs. Abdomen with golden pile contrasting with the darker thorax

sadales

23’ Femora and tibiae not red

24

 

24  Mesonotum uniformly covered with golden or reddish orange, no posterior triangle present on thorax

                                                                                                                                  25

24’ Mesonotum with extensive black pile either covering dorsum or anteriorly at the sides, light pile of thorax concolorous with abdominal pile, or mesonotum yellow haired with the pale pile on the posterior thorax forming a narrow triangle

                                                                  26

 

25  Posterior pronotum black haired; beard and coxal hair usually white; abdominal tergite 7 of female mostly black haired

                                                                                                 aktis

25’ Posterior pronotum with golden hair; beard and coxal hair yellow; abdominal tergite seven of female mostly golden haired

                                                                                               sericea

 

26  Abdominal tergite 6 with two well defined blunt apical processes; apical processes of the hypandrium convergent

                                                                                                        index

26’ Abdominal tergite 6 with a single minute median process; apical processes of hypandrium divergent

                                                                                                                           ithypyga

 

27  Hypopygium wider than tergite 6 when viewed from above; tergite 7 triangular rugose

   canis

27’ Hypopygium not wider than tergite 6; tergite 7 not rugose

                                             28

 

28  Tip of hypandrium tapering and bluntly pointed; tergite 7 distinctly keeled

                    sicula

28’ Tip of hypandrium expanded and leaflike; tergite 7 with small bilobate process

                                                                                                                                      winnemana