TWO GENERA OF CHAiLCID-FLlES^ — GAHAN 341 



3. Apex of costal cell densely ciliated distad of point where submarginal vein 



begins to curve toward anterior margin of wing; frontal ledge not carini- 

 form ; vertex forming an abrupt sharp angle with occiput; lateral ocellus 



less than twice its own diameter in front of occipital truncation 4 



Apex of costal cell bare except for a row of slender, straight hairs on ventral 

 surface adjacent to curve in submarginal vein ; frontal ledge cariniform ; 

 vertex not forming an abrupt, sharp angle with occiput but declining pos- 

 teriorly for a short distance before reaching occipital tmncation ; lateral 

 ocellus two or more times its own diameter in front of occipital trunca- 

 tion 8 



4. Mesoscutum nearly uniformly densely punctate, dull; base of forewing behind 



submarginal vein densely ciliated except for a narrow area along posterior 

 margin and sometimes a narrow subtriangular area adjacent to submar- 

 ginal vein hasad of ix:)int where vein begins to curve ; hind femur slightly 

 narrowed beyond middle and without a marginal flange on Its ventral 



margin 5 



Mesoscutum with concave posterior portion and scapulae less strongly sculp- 

 tured than prescutum ; base of forewing behind straight portion of sub- 

 marginal vein bare except on a narrow streak or area extending obliquely 

 distad from basal angle of wing nearly to reach densely ciliated median 

 portion ; hind femur broader beyond than before its middle and with a dis- 

 tinct, narrow flange on apical one-third of its ventral margin 6 



5. Mesoscutum, axillae, and scutellum clothed with long, coarse, whitish hairs; 



forewing behind and adjacent to submarginal vein with a narrow sub- 

 triangular area bare or nearly bare ; general color dull black 



2. hirtibasis, nevv" species 

 Mesoscutum and axillae clothed with short, pale hairs; scutellum with numer- 

 ous black bristles; forewing without a bare area behind and adjacent to 

 submarginal vein ; general color dark brownish testaceous varied with 

 black 3. longiceps (Brues) 



6. Infuscated medial area of forewing with a strong yellowish or golden tint; 



general color of head and thorax pale yellowish testaceous, only middle of 



mesoscutum and middle of mesosternum blackish 7 



Infuscated medial area of forewing blackish, without a strong yellowish or 

 golden tint; general color darker, mesoscutum at least mostly black- 

 ish 4 costalis, new si)ecies 



7. Length 4.5 mm. Posterior ocellus distinctly more than its own diameter in 



front of the sharp occipital margin 5. aureicorpus (Girault) 



Length 2.75 mm. Posterior ocellus about its own diameter in front of occipital 

 margin g nocua, new species 



8. Mesoscutum nearly uniformly densely punctate over its whole surface, con- 



cave posterior portion and scapulae about as strongly sculptured as pre- 

 scutum 9 



Mesoscutum with concave posterior portion perfectly smooth and polished, 

 or, if weakly sculptured, sculpture obviously weaker than that of pre- 

 scutum IQ 



9. Mostly black or piceous ; anterior femur distinctly broadened beyond middle ; 



scutellum nearly as broad as long; mesoscutum and scutellum conspicu- 

 ously hairy, hairs moderately long; posterior tibia compressed and broad; 



prothorax conical but fully twice as broad as long 7. opaca, new species 



Mostly testaceous, mesoscutum always brownish and abdomen always more or 

 less brownish apically; anterior femur only slightly broadened; scutellum 

 nearly twice as long as broad; mesoscutum and scutellum less conspicu- 



