294 DtTRSAM DtPTERA. 



XXXIV. 



38 (1). Prothoracic and stigmatical bristles absent, seldom 

 represented by fine hairs. Only one sternopleural 

 bristle, which is wanting in one genus, and there 

 replaced by long fine hairs. Five dorso-central 

 bristles, if fewer then the palpi broad. At least 

 four scutellar bristles. Wings long, seldom short ; 

 if comparatively short then the abdomen un- 

 usually long. 



39(64). Head broad; palpi broad, spoon-shaped in front, or 

 altogether broad and leaf-like. 



Sub-Family III. — Hydromyzinje. 



40 (41). Eyes and head from vertex to jowls longer than 



broad ; only one pair of ddrso-central bristles 

 (pras-scutellar) ; jowls broad ; proboscis thick, 

 short ; mouth with short bristles ; antennae short, 

 rounded in front ; abdomen flat ; hypopygium only 

 slightly protruding; V.3. and V.4. converging a 

 little; large bare species with grey dusting. 



491. Hydromyza, Fin. (2213. livens, F.) 



41 (40). Eyes and head round ; five dorso-central bristles. 



42 (43). Sternopleurae without bristles, only haired ; wings 



with round brown spots, which have dark central 

 dots. Ernoneura, Beck, (argus, Ztt.) 



43 (42). One sternopleural bristle ; wings not spotted. 



44 (45). Inner side of the fore tibiae at the tip with a short 



porrected (horizontally extended) thorn in addition 

 to the usual end bristles. 

 Acanthocnema, Beck, (nigrimana, Ztt., glaucescens, 



Lw., latipennis, Beck.) 



45 (44). Inner tip of fore tibiae without this thorn. 



46 (51). Genitalia of the male with long tufts of hair. 



47 (50). Third antennal joint rather long with sharp upper 



corner ; mouth with numerous crowded bristles. 



48 (49). Dorsum long ; jowls very long-haired ; on either side 



of the male genitalia, closely approximated skein- 

 like tufts of long orange hairs ; wings of the male 

 with two additional X-veins. 



492. Pogonota, Ztt. (2214. hircus, Ztt.) 



