Key to genus LONCHAEA and EAROMYIA . District of Columbia U.S.A.

Key to genus LONCHAEA and EAROMYIA . District of Columbia  U.S.A.

 Extracted from : Malloch and McAtee 1924. Keys to flies of the families Lonchaeidae, Pallopteridae, and Sapromyzidae of the eastern United States, with a list of the species of the District of Columbia region. Proceedings of the United States National Museum, 65(2525): 1-26, 2 pls..

 1. Frons in both sexes with large irregular pits or depressions; a strong bristle near anterior margin of cheek  …   L. vibrissata Malloch.

- Frons impunctate or almost so, not pitted ……………………….           2

 2. Several bristly hairs surrounding the stigmatal bristle  …………………….  3

- No hairs surrounding stigmatal bristle …………………………………………. 11

 3. Fringes of calyptrae black or fuscous ……………………………………..  4

- Fringes of calyptrae white or yellow …………………………………………..  9

 4. Third antennal segment much less than twice as long as its greatest width; frontal lunule bare ; ovipositor abnormally wide ………………     Earomyia aterrima Malloch.

-Third antennal segment over twice as long as wide ; frontal lunule with some hairs  ........................ 5

5. Eyes in both sexes distinctly hairy, in the male conspicuously so; second costal division very long; disk of scutellum hairy  …………………………..…………….    6

Eyes bare or almost so ……………………………………………………………….   7

 6. Pteropleura hairy in centre; cheeks with dense short erect fine hairs … L. pleurlseta Malloch.

- Pteropleura bare; cheeks with longer setulose hairs ….......……… L. ursina Malloch.

 7. Tarsi entirely black …………………………………………….. L. atritarsis Malloch.

- Tarsi largely yellowish ………………………………………………………….   8

 8. Orbit with several long fine hairs above the bristle; cheeks, frons, and mesonotum with rather dense erect black hairs ; wings whitish or yellowish, infuscated at bases ; scutellum with some long erect hairs on disk near apex as well as on the margins; pteropleura usually with one or two long hairs in centre……….  L. hirta Malloch.

 - Orbits bare or with a single hair above bristle; cheeks, frons, and mesonotum with more sparse black hairs ; scutellum generally bare on disk pteropleura bare …………………………………………………………………………..  L. affinis Malloch.

 9. Third antennal segment but little longer than wide; scutellum with four strong bristles and no fine hairs ; face of male silvery ; ovipositor of female nearly as broad as frons, acutely pointed at apex, the preapical hairs very short ; auxiliary vein nearly fused with first at apex. ………………………………………….. L. arkansensis Malloch

- Third antennal segment about three times as long as wide; scutellum with some fine hairs on margins as well as the four long bristles ; face of male not silvery ; female ovipositor slender, very much narrower than frons  ……………………………. 10

10. Glossy upper portion of orbits black; orbital bristle not proximad of anterior ocellus; cheek with dense short stiff hairs; third antennal segment not over three times as long as wide, almost entirely orange red. ………….......................… L. ruficornis Malloch.

- Glossy upper portion of orbits blue; orbital bristle distinctly proximad of anterior ocellus ; cheek with some short hairs and one or two longer bristles; third antennal segment over three times as long as its greatest width, upper half or more blackened ; hind femur with several long bristles on apical half of anteroventral surface …………. L. winnemanae Malloch.

 11. Ovipositor of female nearly as wide as frons; calyptrae and their fringes white; tarsi largely yellowish; scutellum without fine hairs………     L. arkansensis Malloch.

 - Ovipositor slender, much narrower than frons ; scutellum usually with fine hairs in addition to the strong bristles ………………………………………….. 12

12. Face and parafacials when viewed from above conspicuously whitish pruinescent ; frons of female dark steel-blue, shining, sparsely and evenly haired, and with a transverse depression midway between anterior margin and anterior ocellus ; third antennal segment but little longer than wide ; a strong curved bristle near anterior margin of cheek ; tarsi slightly pale basally; calyptrae and their fringes brown; no fine hairs on scutellum ……. L. albiceps Malloch.

 - Face but little whitish pruinescent when viewed from above; frons not steel-blue, and without a transverse depression; cheek either without a strong bristle or with several  ……………    13

 13. Legs entirely black ……………………..  14

- At least the bases of tarsi yellowish …. 17

14. Fringes of calyptrae brown or fuscous ……………..   15

- Fringes of calyptrae white; cheek without strong bristles …………………..   16

 15. Cheek with four outstanding bristles; no hairs between the scutellar bristles; frons slightly bluish or greenish; third antennal segment about 1.5 as long as wide ………  L. quadrisetosa Malloch.

- Cheek without outstanding bristles; some fine hairs between the apical pair of scutellar bristles; frons black ………………  L. angustitarsis Malloch.

16. Some fine hairs between the apical pair of scutellar bristles. ........L. vaginalis Fallen.     (Probably not this species)

-  No fine hairs between the apical pair of scutellar bristles …......   L. marylandica Malloch.

17. Frontal lunule bare; fringes of calyptrae brown; interfrontalia with two series of incurved hairs on centre; glossy portion of upper orbits microscopically strigose …………      Earomyia aberrans Malloch.

-  Frontal lunule with setulose hairs at least on the sides except in nigrociliata; fringes of calyptrae whitish or yellowish except in nigrociliata and subpolita; glossy portion of upper orbits usually smooth (compare occidentalis and coloradensis) ……… 18

I8. No minute hairs between the apical pair of scutellar bristles; third antennal segment not or barely over twice as long as its greatest width ………………… 19

 - Some minute hairs between the apical pair of scutellar bristles; third antennal segment more than twice as long as its greatest width  ……………………..  20

19. Tarsi brown ; larger species, fully 4 mm. in length ....…. L. marylandica Malloch.

- Tarsi pale yellow; smaller species, less than 4 mm. in length...... L. laticornis Meigen. (Probably not this species)

20. Fringes of calyptrae fuscous  ………… 21

-  Fringes of calyptrae white or yellow; thorax and abdomen bluish ……. 22

21. Frontal lunule bare; head and thorax black, abdomen slightly bluish …………     Earomyia nigrociliata Malloch.

 -  Frontal lunule hairy; thorax and abdomen blackish blue ……… L. subpolita Malloch.

22. Width of male frons at anterior margin equal to at least half the entire length of frons ; preapical dorsal pair of hairs on ovipositor very long hairs at angle of calyptrae much longer than rest of fringe; upper orbits largely microscopically strigose …………………………………………………..   L. occidentalis Malloch.

-  Width of male frons at anterior margin not nearly equal to half its entire length; preapical dorsal hairs on ovipositor very short; fringes of calyptrae of uniform length ……………..   23

23. Third antennal segment about twice as long as wide; upper frontal orbits granulose ………………  L. coloradensis Malloch.

-  Third antennal segment at least three times as long as wide; upper frontal orbits largely or entirely polished  …………….. 24

24. Only the basal segment of each tarsus yellow  …………  L. longlcornis Williston.

-  Basal two or three segments of each tarsus yellow   ………………………….  25

25. Larger species, over 4 mm. in length; hypopygium as in Figure 3 ……..  L. nudifemorata Malloch.

-  Smaller species, less than 4 mm. in length; hypopygium of male as in gure 1 ……………….   L. polita Say.

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith