464 



Wirth and Stone: Diptera 



Fig. 14:55. Ephydridae adults, a-c, Oi'chaeta caudata (Fall.): 

 a, head; b, wing; c, posterior segments of male abdomen, d,e, 

 Gymnopa tibialis (Cr.): d, head; e, wing, f, Psilopa, head; g, 

 Plagiopsis, head and dorsal outline of body; h, Hydrellia, head; 

 i, Pseudohecamede, head; /', Typopsilopa, head; k, Discocerina, 

 head; /, Ptilomyia, head; m, Parydra, head; n, Ocbrhera, front 

 leg; o,p. Zeros: o, wing; p, head (Cresson, 1917, 1918). 



or absent 2 



2. Frontal bristles reclinate or proclinate, rarely absent 

 (fig. 14:55a"); 2nd antennal segment bearing 1 or more 

 spinous bristles at the upper apical corner (figs. 

 14:54A,i; 14:55a) (except absent in Glenanthe, which 

 also has arista bare) 3 



— Frontal bristles lateroclinate, curving over eyes, some- 

 times small, rarely absent; 2nd antennal segment lack- 

 ing spinous bristle at upper apical corner (except 

 Ochthera, with fore femur greatly swollen) (PARY- 

 DRINAE) 41 



3. Mesonotum without discal seriate macrochaetae, at 

 most with a pair of interalars and a pair of prescutellar 

 acrostichals (figs. 14:54a 7 ; 14:55a) (PSILOPINAE) 

 4 



— Mesonotum with well-developed seriate macrochaetae, 

 2 or 3 pairs of true dorsocentrals present (NOTIPHI- 

 LINAE) 31 



4. Shining to opaque species with setation usually well 

 developed; postbucca generally setulose and its 

 posterior margin if sharp is not marginate; facial area 

 usually not sculptured 5 



— Shining black species with setation much reduced, 

 postbucca bare and its posterior margin sharp and 



10. 



11. 



12. 



13. 



14. 



15. 



16. 



17. 



reflexed; facials usually in pitted or rugulose depres- 

 sions (fig. 14:550") (GYMNOPINI) 8 



Posterior notopleural at or near notopleural suture, 

 horizontally aligned with the anterior one; aristal hairs 



straight (fig. 14:55^) 6 



Posterior notopleural distinctly removed dorsad from 

 the notopleural suture; aristal hairs curved (fig. 14:55i) 



(or arista bare in Glenanthe) (ATISSINI) 10 



Ocellars situated caudad of anterior ocellus, sometimes 

 between posterior ocelli; antennae with upper distal 



spinous bristle; mostly shining species 7 



Ocellars situated cephalad of line of, or in line with, 

 anterior ocellus (2nd larger pair in ocellar triangle in 

 Paratissa); antennae without upper distal spinous 

 bristle; mostly opaque pruinose species (DISCO- 



CERININI) 17 



Frons and face distinctly sculptured; 3 or more facials 

 present and well removed from parafacies; setation 

 weakly developed, the mesonotal setulae not seriated 



(DISCOMYZINI) 23 



Frons and face at most weakly sculptured mesad; rarely 

 more than 2 facials present and usually near parafacies 

 (fig. 14:55/,a); setation well developed, the mesonotal 



setulae usually seriated (PSILOPINI) 24 



Alula of wings broad (fig. 14:55e); frontals and ocellars 

 absent or minute (fig. 14:550"); arista bare; 1 notopleural 



present Gymnopa Fallen 



Alula of wings narrow; frontals and ocellars well 

 developed; fxista more or less pectinate; 2 notopleurals 



present 9 



Face medianly tuberculose; acrostichal hairs in 6 

 sparse rows; fore femur without flexor comb (not Cali- 

 fornia) Parathyroglossa Hendel 



Face evenly convex or with transverse gibbosity; acro- 

 stichal hairs more numerous and nonseriate; fore femur 



usually with flexor comb Athyroglossa Loew 



No distinct orbitals or ocellars evident, the front with 

 small hairs only; arista pubsecent above and below; 

 tiny whitish species with bristles reduced to fine hairs 



Asmeringa Becker 



At least the reclinate orbital and usually the ocellars 



well developed 11 



Eyes pear-shaped, strongly constricted below; arista 



bare; not California Glenanthe Haliday 



Eyes normal; arista pectinate 12 



Face with median shining tubercle; cheeks broad, 

 setulose; mesofrons setulose; scute Hum with more than 



4 marginals; not California Hecamede Haliday 



Face without shining median tubercle; mesofrons not 



setulose; scutellum with 4 marginals 13 



Frontals cephalad of line of ocellars, the latter caudad 



of line of anterior ocellus 14 



Frontals about aligned with ocellars, the latter cephalad 



of line of anterior ocellus 16 



Face conically prominent above epistoma, with a 

 median pair of upcurved setae; 2nd costal section less 



than 1.5 times as long as 3rd Ptilomyia Coquillett 



Face most prominent near epistoma, without median 



pair of upcurved setae (fig. 14:54e) 15 



Ocellars minute; a pair of larger divergent interfrontals 



anterior to anterior ocellus 



Pelignellus Sturtevant and Wheeler 



Ocellars strong, no interfrontals present anterior to 



anterior ocellus Atissa Haliday 



Proboscis slender, geniculate, with lanceolate labellum 



Pseudohecamede Hendel 



Proboscis normal, with fleshy labellum 



Allotrichoma Becker 



Face with a secondary series of dorsolateral ly inclined 

 setae laterad of primaries; eyes pilose; notopleura 



setulose P oly trie hop hora Cresson 



Face with secondary series absent or suggested only 

 by mesally inclined setulae 18 



