Au4'ii'!t — December iS^p. 



PSrCHE. 



257 



seems extremely probable. 



Both Lynch and Osten Sacken have 

 commented upon the difficulty of iden- 

 tifying the described species of Atonio- 

 sia, and 1 can agree with them. There 

 seem to be numerous structural charac- 

 ters that have been but little used, either 

 for generic or sj^ecific discrimination. 

 Asa contribution to the better definition 

 of the Atomosia ^You-p of genera, I ofler 

 the following : 



A. — Third joint of the antennae 

 longer than the first two togeth- 

 er, without style ; eyes on the 

 side of the front emarginate, the 

 front not w^idened above ; scu- 

 tellum with bristles ; first pos- 

 terior : cell usually narrowed ; 

 bodv punctulate. 



Atomosia Macq. 

 "• Third antennal joint longer than 

 the first two together, without 

 distinct style [front .^] ; scutel- 

 lum without bristles. Hind 

 femora with spinous bristles ; 

 hind tibiae feebly ciliate within. 

 Body punctulate." 



Rhathimoniyia Lynch. 

 " Third antennal joint longer than 

 the first two together, without 

 distinct style [Front broad 

 above?]. Abdomen much con- 

 stricted at base, not strongly punc- 

 tulate ; wings and legs long." 



Hu7uecosoma Schiner. 

 "Third antennal joint at least three 

 times as long as the first two 

 joints together, without stvle. 

 Large species." [Front? punc- 

 tulation?] 



Apkes^fia Schiner. 



Third joint of antennae longer 

 than the first two together, with 

 a terminal style ; eyes not, or 

 but very slightly emarginate on 

 the sides of the front, the front 

 much wider above ; scutellum 

 without bristles, or with hair-like 

 ones. Atonia^ gen. nov. 



First joint of antennae about as 

 long as the third, the latter with- 

 out terminal style. Front much 

 widened above, the eyes disci- 

 form and with enlarged facets 

 in front ; scutellum with weak 

 bristles ; body punctulate. 



Cerotainia Schiner. 

 First joint of antennae as long as 

 the third, without style. Scutel- 

 lum without bristles. Abdomen 

 punctulate, slender. Thorax re- 

 markably. projecting forward in a 

 hemispherical, constricted emi- 

 nence. Cyphotof/iyia^gen. nov. 

 Third joint of the antennae longer 

 than the first two together, with- 

 out style ; front wide above ; 

 scutellum with fine bristles ; seven 

 abdominal segments visible in 

 the male from above ; abdomen 

 smooth, not punctulate. 



Lamprozofia Loew. 

 The genus Atonia is. I believe, well 

 founded, and will include a number of 

 species, such as A. ancyloccra Schiner, 

 A. w/7'/V Williston, etc. Cyphotomyia 

 is perhaps more doubtful, but the entire 

 absence of bristles on the scutellum, 

 and apparently also on the ocelligerous 

 tubercle, together with the remarkable 

 development of the thorax, will, I be- 

 lieve, justify its erection. The species 



