408 



Wirth and Stone: Diptera 



— Front basitarsus longer than front tibia (fig. 14:286); 19. 

 male dististyle directed rigidly backward (fig. 14:206, c); 

 combs present on middle and hind tibiae (fig. 14:21c-n) — 

 (TENDIPEDINAE) 32 20. 



5. Pronotum not or slightly notched anteriorly on median 

 line; anepisternal suture well developed; male antennae 

 normally plumose (HYDROBAENINAE) 18 — 



— Pronotum widely divided into lateral lobes; anepisternal 

 suture short or absent (fig. 14:30;'); male antennae 21. 

 almost bare, never plumose (fig. 14:306) (CLUNIO- 

 NINAE) 27 — 



6. Costa not produced or but very slightly produced beyond 22. 

 tip of the posterior radial branch (fig. 14:20/>); wing 

 hairy; female antenna with 12 or rarely 13 segments; — 

 4th tarsal segment linear Pentaneura Philippi 



— Costa distinctly produced beyond tip of posterior radial 23 

 branch (fig. 14:1c); female antennae with 13 to 15 

 segments 7 



7. Fourth tarsal segment linear; wing either hairy or bare — 



8 24, 



— Fourth tarsal segment cordiform (bilobed above), shorter — 

 than 1/5; wing bare 10 25. 



8. Mediocubital fork sessile; antennae of both sexes 15- 

 segmented; wings more or less hairy, at least at tip — 



Anatopynia Johannsen 26, 



— Mediocubital fork with petiole 9 



9. Petiole of mediocubital fork measured from the cross 

 vein not 1/3 as long as posterior branch; wing hairy; — 

 acrostichal hairs absent; wings spotted. Pelopia Meigen 



— Petiole of mediocubital fork at least 1/2 as long as 27. 

 posterior branch (fig. 14:1c); wing hairy or bare; 

 acrostichal hairs present Procladius Skuse 



10. Petiole of mediocubital fork measured from the cross 

 vein 1/4 or more as long as the posterior branch; minute 

 acrostichal hairs present on median line of thorax 



Clinotanypus Kieffer — 



— Petiole of fork less than 1/6 as long as posterior 

 branch or fork wholly sessile; no acrostichals 



Coelotanypus Kieffer 



11. Large pulvilli present; empodium much-branched; medio- 

 cubitus with long petiole; eyes with short dense pile; 28. 

 antennae 15-segmented; hind tibiae without comb . . . 

 Trie hot any pus Kieffer 



— Pulvilli absent 12 



12. Mediocubital fork petiolate (fig. 14:20d); eyes bare; 

 antennae 14-segmented; hind tibia with a single pubes- — 

 cent spur; outer spur absent, with a loose comb of 

 about 6 bristles; empodium of moderate length 



Boreochlus Edwards 



— Mediocubital fork sessile 13 29. 



13. Hind tibia without a definite comb on inner side at 

 tip, both spurs long; 1st branch of radius long and 

 slender throughout in both sexes; female antennae — 

 elongate, 15-segmented Lasiodiamesa Kieffer 



— Hind tibial comb present, 1 spur short; 1st radial 

 branch shorter, more or less swollen at tip in female; 30. 

 female antenna short with 8-12 segments 



. . P odonomus Philippi — 



14. Mediocubital fork just beyond posterior cross vein; 

 eyes bare; 4th tarsal segment cylindrical 31, 



Prodiamesa Kieffer 



— Mediocubital fork just before posterior cross vein — 

 (fig. 14:20/) 15 



15. Fourth tarsal segment more or less cordiform, shorter 

 or at least not longer than the 5th 16 



— Fourth tarsal segment cylindrical, longer than the 5th 



Syndiamesa Kieffer 32. 



16. Eyes finely pubescent; male antennae plumose 



Diamesa Meigen 



— Eyes bare 17 



17. Legs annulate with light and dark; male antennae not 

 plumose Heptagyia Philippi — 



— Legs not annulate Psilodiamesa Kieffer 



18. Radius fused with costa and not reaching 3/4 its 

 length; a false vein running close to the anterior 

 margin of the wing (fig. 14:20;') . .Corynoneura Winnertz 



— Radius free; no false vein (fig. 14:20Z) 19 



Wing membrane with macrotrichiae, at least at tip 



(fig. 14:20c) 20 



Wing membrane bare 23 



Cross vein r-m very long and oblique, appearing as the 

 base of the posterior branch of the radius; male disti- 



styles forked; small pulvilli present 21 



Cross vein r-m short (fig. 14:20J); male dististyles not 



forked ■ 22 



Mesonotum conically produced over the head in front; 



wings spotted Eurycnemus van der Wulp 



Mesonotum not produced; wing unmarked. Brillia Kieffer 

 Pulvilli absent; wing hairs decumbent 



Me trio one mus van der Wulp 



Pulvilli present but small; wing hairs suberect, restrict- 

 ed to wing tip Hydrobaenus Fries (part) 



Mesonotum with a longitudinal fissure; wings black 

 with white markings in most species (fig. 14:20c) 



C has matonotus Loew 



Mesonotum without distinct longitudinal -fissure 24 



Palpi porrect, 3-segmented Symbiocladius Kieffer 



Palpi flexible, 4-segmented 25 



Fourth tarsal segment of at least hind leg cordiform, 



shorter than 5th Cardiocladius Kieffer 



Fourth tarsal segment linear 26 



Dorsocentral hairs minute and decumbent; tibiae often 

 with pale rings; terminalia often white; eyes densely 



pubescent Cricotopus van der Wulp 



Dorsocentral hairs stronger and suberect; tibiae not 

 banded; eyes usually bare . . . .Hydrobaenus Fries (part) 

 Hind tarsi with the 2nd segment not longer than the 

 3rd; all tarsi with the 4th segment cylindrical and 

 simple, the 5th simple and never trilobed; antennae 

 4- to 11-segmented, often with sexual dimorphism; eyes 

 usually hairy; male genitalia moderate to large; female 



abdomen rounded caudad 28 



Hind tarsi with the 2nd segment longer than 3rd; all 

 tarsi with the 4th segment cordiform, the 5th simple or 

 deeply trilobed at tip; antennae 7-segmented in both 

 sexes; eyes bare; male genitalia small; female abdomen 



tapered 30 



Second hind tarsal segment much shorter than 3rd, the 

 5th segment slightly bilobed; wings fully developed 

 (male) (fig. 14:296) or absent (female) (fig. 14:29a); 

 antenna usually 11-segmented (male) or 7-segmented 



(female); Florida Coasts Clunio Haliday 



Second hind tarsal segment subequal to 3rd, the 5th 

 segment simple; wings straplike or practically absent, 

 similar in the two sexes; antennae 4- to 7-segmented 



29 



Wings -straplike, reaching to 4th segment of abdomen, 

 halteres present; palpi long, 3- or 4-segmented; anten- 

 nae 6-segmented Eretmoptera Kellogg 



Wings vestigial, not reaching to abdomen, halteres 

 absent; palpi short, 1-segmented; antennae 7-segmented 



(fig. 14:30a,6) Tethymyia Wirth 



Fifth tarsal segment simple or slightly bilobed; Florida 



coasts Thalassomya Schiner 



Fifth tarsal segment deeply trilobed at tip (fig. 14:30A) 



31 



Legs unmodified; hairs of legs weak (fig. 14:30;'); Cali- 

 fornia, New York, Florida Telmatogeton Schiner 



Front legs of male modified, the femora swollen with an 

 angular projection near apex which interlocks with a 

 basal projection of the tibia; hairs of legs strong, 

 sometimes flattened as appressed scales (fig. 14:30t); 



Pacific Coast Paraclunio Kieffer 



Wing membrane with macrotrichia at least toward the 

 apex; squama without a fringe of hairs; r-m cross vein 

 nearly longitudinal in position, apparently continuous 

 with posterior branch of radius (fig. 14:20^) (CALOP- 



SECTRINI) Calopsectra Kieffer 



Wing membrane without macrotrichia, or if macro- 

 trichia are present, then squama with a marginal fringe 

 of long hairs; r-m cross vein distinctly oblique to direc- 

 tion of posterior branch of radius (TENDIPEDINI) 

 33 



