412 



Wirth and Stone: Diptera 



13. Lateral lobes of anal segment without a fringe of 

 spines or bristles (fig. 14:25a) 14 



— Lateral lobes of anal segment with a fringe of spines 

 or bristles (fig. 14:25^) 15 



14. Abdominal segments uniformly shagreened; anal seg- 

 ment on each side with 3 short stiff bristles hooked at 

 apex; pupa 3-4 mm. long, in a gelatinous semiellipsoid 

 case (fig. 14:29^) Heptagyia Philippi 



— Pupa not in a gelatinous case; anal bristles long (fig. 



14:25a); length usually more than 4 mm 



Diamesa Meigen 



15. Several branched hairs near lateral margins of ab- 

 dominal segments; lobes of anal segment each with 

 3 bristles near apex 16 



— No lateral branched hairs on abdominal segments; anal 

 segment with 4 or 5 apical bristles (fig. 14:25<7) .... 



Prodiamesa Kieffer 



16. Two or 3 pairs of darker "chitin-spots" regularly 

 arranged on each segment; a fringe of very fine hairlike 

 points uniformly spaced on lateral margin of lobes of 



9th segment, in addition to the apical bristles 



Syndiamesa Kieffer 



— Without paired dark "chitin-spots"; lateral lobes of 

 9th segment with a dense fringe of fine hairs 



Psilodiamesa Kieffer 



17. Last abdominal segment obliquely truncated, forming 

 an elliptical highly sclerotized disc (fig. 14:28;); 

 prothoracic respiratory organs present (fig. 14:28i) 

 (marine species) 18 



— Last abdominal segment not forming an oblique, highly 

 sclerotized, flattened disc 19 



18. Prothoracic respiratory organs wedge-shaped, the point 

 directed forward and downward, the spiracle near the 

 base (fig. 14:28z) Paraclunio Kieffer 



Telmatogeton Schiner 



— Prothoracic respiratory organ more or less tubular, with 

 terminal spiracle Thalassomya Schiner 



19. Minute species, 3 mm. or less in length, attached to 

 aquatic plants and enclosed in a gelatinous case; 

 prothoracic respiratory organs lacking; abdominal 

 segments each with 4 hairs or filaments on each side; 

 tergites shagreened; caudal lobes each margined with 

 swim hairs (fig. 14:27<i) Corynoneura Winnertz 



— Larger species, not as above 20 



20. Symbiotic on mayflies or stoneflies 21 



— Not symbiotic on mayflies or stoneflies 22 



21. In a web under wing covers of mayfly nymphs; respira- 

 tory organs absent Symbiocladius Kieffer 



— Respiratory organs ovoid or elongate and tapering 

 Hydrobaenus Fries (part) 



22. Posterior margins of segments with closely set rounded 

 warts; respiratory organs present or lacking (figs. 

 14:27#, 14:29£) Metriocnemus van der Wulp 



— Posterior margins of segments with posteriorly directed 

 points or spines (fig. 14:28/) 23 



23. Respiratory organs broadened distally, with spinules, 

 apex more or less emarginate or if not, posterior margin 

 of 2nd tergite without a row of hooks; tergites sha- 

 greened; caudal lobes margined with swim hairs and 

 each terminating in 3 more or less curved bristles 



Brillia Kieffer 



— Not as above 24 



24. Prothoracic respiratory organs absent; posterior margins 

 of tergites 1-8 with a row of sharp, closely set, caudal- 

 projecting spines; tergites 2-6 each with transverse 

 patches of coarse spinules; length of pupa 4-5 mm. 

 Cardiocladius Kieffer 



— Tergites with smaller spinules, or otherwise differing 

 25 



25. Intermediate tergites with shagreen covering a con- 

 siderable part, leaving anterior and lateral margins 

 free, or arranged in wide transverse bands; prothoracic 

 respiratory organs cylindrical, tubular, with or without 

 spinules, rarely clavate and rarely absent; caudal lobes 

 each with 3 closely set, curved, apical bristles but 

 without a fringe of swim hairs (fig. 14:272) 



Cricotopus van der Wulp 



— Shagreen distributed differently or respiratory organs 

 or armature of caudal lobe otherwise 2( 



26. Exclusively marine species 2' 



— Principally fresh-water or terrestrial species, althougl 

 a few marine forms are known .Hydrobaenus Fries (part 



27. Abdominal sternites with rows of spinules on posterioi 

 margins; sheaths of gonostyles with sharp-pointe< 

 apices Clunio Haliday 



— Abdominal sternites without rows of spinules on poste- 

 rior margins; sheaths of gonostyles without sharp- 

 pointed apices (fig. \\'.ZQd,g) Tethymyia Wirth 



28. Prothoracic respiratory organs simple, seldom absent 

 (fig. 14:32fi0 Calopsectra Kieffer 



— Prothoracic respiratory organs composed of at least 

 2 branches, usually a tuft of numerous filaments 

 29 



29. Lateroposterior angles of 8th segment without a comb 

 or a spur (fig. 14:34/); cephalic tubercles present (fig. 

 14:34e) Crypt ochironomus Kieffer 



— Lateroposterior angles of 8th segment with either a 

 comb or a spur 30 



30. Prothoracic respiratory organs each with 2-12 branches 

 (figs. 14:322; 14:336,A) 31 



— Prothoracic respiratory organs each with numerous 

 (more than 20) filaments (figs. 14:31;'; 14:35c) 36 



31. Each lateroposterior angle of 8th abdominal segment 

 with a strong spur bearing some spinules (fig. 14:3 Id); 

 prothoracic respiratory organs each with 4-8 branches 

 Polypedilum Kieffer 



— Lateroposterior angles of 8th segment with a comb; 

 prothoracic respiratory organs each with 4, 7, or 11 

 branches 32 



32. Prothoracic respiratory organs each with 4-12 branches; 

 cephalic tubercles present (fig. 14:33/) 33 



— Prothoracic respiratory organs each with 2 or 4 branches; 

 cephalic tubercles absent 35 



33. Prothoracic respiratory organ 11-branched, one branch 

 much larger than the others (fig. 14:33 A); lateral margin 

 of 8th abdominal segment with 4 filaments; combs of 

 8th segment each with 5-6 strong teeth and some finer 

 spinules (fig. 14:33<7) Paratendipes Kieffer 



— Prothoracic respiratory organ 4- or 7-branched, the 

 largest branch bearing apically a number of acute 

 papillae (fig. 14:336); lateral margins of 8th segment 

 each with 4 or 5 filaments; combs of 8th segment each 

 with 3-6 teeth (fig. 14:33e) 34 



34. Prothoracic respiratory organ with 7 branches; 8th 

 segment with 5 filaments on each lateral margin . . 



Microtendipes Kieffer 



— Prothoracic respiratory organ with 4 branches; 8th 

 segment with 4 filaments on each lateral margin .... 



Stenochironomus Kieffer 



35. Prothoracic respiratory organ with 2 branches, both 

 smooth (fig. 14:322) Pseudochironomus Malloch 



— Prothoracic respiratory organ with 2 or 4 branches, one 

 of them covered with short, pointed papillae or evagina- 

 tions Lauterb orniella Bause 



36. Lateroposterior angles of 8th abdominal segment each 

 with a comb of 2, 3, or more teeth or spines (figs. 



14:34c,m; 14:35e) 37 



— Lateroposterior angles of 8th segment with a simple or 

 compound spur (fig. 14:356,/) Tendipes Meigen 



37. Some tergites of abdomen with a spiked macelike 

 process (fig. 14:31t) Glyptotendipes Kieffer 



— Tergites without such a process 



Tanytarsus van der Wulp 



Harnischia Kieffer 



California Species of Tendipedida* 



Subfamily PELOPIINAE (= TANYPODINAE) 



The larvae of the Pelopiinae are predaceous, feeding 

 largely on other tendipedid larvae and often found in 



