THE CANADIAN ENTOMOLOGIST. 157 



Rhopalodontus perforatus Gyll. Eur. Im., larv., nymph. In Polyporus 



frutnentarius. 

 Ennearthron affine Gyll. Eur. Im., larv.; in Polyporus squamosns. 

 Odotemnus sp. Detroit, Mich. Im., larv.j in old sponges, by Mr. H. J. 

 Hubbard, Aug., 1874. 



Of the 668 species given in Harold's Catalogue, the previous stages 

 of 100 species are published. They belong to 34 genera of the 81 

 enumerated by Harold. Only of 28 genera of the 53 enumerated in Mr. 

 Henshaw's Catalogue of the Insects of the U. S., the previous stages are 

 known. Only of 13 species of the 176 mentioned by Mr. Henshaw have 

 the previous stages been described. 



THE NORTH AMERICAN GENERA OF ANTHRACINA. 



BY D. W. COQUILLETT, LOS ANGELES, CAL. 



The sub-family Anthracina differs from any other of the Bombylidse, 

 as well as from any other group of Diptera known to me, in that the 

 second vein issues from the third at a point opposite or nearly opposite 

 the small cross-vein, the distance being never greater than the length of 

 that -cross-vein ; the course of the third vein at the place where the second 

 vein issues from it, is perfectly straight, while in the other Diptera the 

 third vein bends obliquely downward at the same angle that the second 

 vein extends upward at its base. 



The genus Dipalta O. S. must be united to Anthrax Scop. It was 

 founded upon a species (serpentina O. S., West. Dipt., 237) which differs 

 from a typical Anthrax only in having three submarginal cells in each 

 wing instead of two, and also in that the second vein is strongly bent 

 S-shaped before its tip. I have two undescribed species which agree in 

 every particular with D. serpefitma O. S., except the course of the second 

 vein ; in one of these species this vein is nearly as strongly bent S-shaped 

 before its tip as in serpentina, but in the other species it is not more 

 strongly curved than in an ordinary Anthrax. The number of submar- 

 ginal cells in each wing — three in Dipalta and normally only two in 

 Anthrax — will not serve to separate these two genera, since specimens 

 occur in several different species of A?ithrax in which there are three 



