THE MYCETOPIIILID,^ OF NORTH AMERICA. 233 



2. Diadocidia borealis Coquillett. 

 1900. borealis Coquillett, Proc. Wash. Acad. Sciences. II. 390. 

 Male. Length 4 mm. Head and antennae dark brown, two 

 basal joints of the latter, also the proboscis and palpi, yellow; 

 thorax polished, yellow, the dorsum, except the front corners, 

 dark brown ; scutellum yellow ; metanotum brown ; abdomen 

 dark brown, slightly polished, its hairs yellowish ; coxae and 

 femora light yellow, tibiae and tarsi brown, front tarsi slender; 

 knob of halteres yellowish brown; wings hyaline, densely cov- 

 ered with short hairs, subcostal crossvein present, tip of Ri about 

 opposite apex of anterior branch of the cubitus. Lowe Inlet. 

 B. C. 



4. Subfamily CER0Pi.ATiNy-E. 

 Ccroplatincc, Winnertz. \"erh. Zool. — hot. Ges. Wien. XIII. 684. 



1863. 

 The primary distinction possessed by the members of this 

 subfamily is found in the wing venation. The R — M crossvein 

 is obliterated by the coalescence of a section of the basal portion 

 of the radius and media at the point where the crossvein usually 

 is. The antennae are short, usually thickened, and often more 

 or less flattened. 



Tabic of Genera. 

 a. Face and proboscis prolonged, beak-like or snout-like, 

 (figs. 46, 49 and 87). I. Asindxduin. 



aa. Proboscis short, not beak-like. 



b. Antennae ver}^ much flattened, strap-like; palpi porrect, 

 not incurved (figs. 47, 48). 

 c. Ri+.-i ends in Ri (fig. 82). 2. Ceroplafits. 



cc. R-:+:-. ends in the costa (fig. 83). T,.CerotcIioii. 

 bb. Antennae not conspicuously flattened, palpi incurved, 

 and moderately elongate, 

 c. ]\Iedia arises at the base of the wing, basal section 

 may be delicate and fold-like, 

 d. Rt:-|-3 ends in the costa (fig. 89). 



4. Hesperodes. 

 dd. Rs-fs ends in Ri (fig. 88). 5. Apcinon. 



cc. Aledia apparently arises at the crossveins ; i. e., its 

 basal section wanting (figs. 84, 85, 86). 



6. Plah'ura. 



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