928 Charles IVul Alexander 



sordidly yellow and lihick, with the suifaco shiny. The antennae of 

 the male arc siibnionilifonn with the seji;nients heart-shajXHl, as shown 

 in figure 125, i ([xige SoO). The larva, whicii has been discussed by the 

 writer in another paper (Alexan(l(>r, 1914 a), lives in certain terrestrial 

 mosses (as Hypnuni). It is brij2;ht fj;reen in color, with darker stripes on 

 the sides, and clos(>l>' sinuilates tii(^ app(virance of its host plant, the 

 illusion being heightened by tlu> spines and excrescences that cover 

 the body. 



Liogma nodicornis (0. S.) 



1S65 Triogma nodwornis 0. S. Proc. Ent. Soo. Phila., vol. 4, p. 239. 

 1887 Liogma nodicornis O. S. Berl. Ent. Ztschr., vol. 31, p. 226. 



Liogma nodicornis is a common fly in Canadian conditions thruout 

 North America. In color it is mainly yellow, th(> head black and shiny, 

 the thorax yellow with tlnve nior(^ or less confluent shiny black sti'ipes 

 on the dorsum, the pleura with one oi- two large black blotclu^s. The 

 venation (Plate XXX, 5) is somewhat variable, esjxH'ially in the fusion 

 of A'4+5 on il/] + 2, these being in some cas(\s bioadly fused (as shown 

 in figure 128, i, page 862), in other cases with the cross-vein r-m apparent. 



SUBFAMILY Tipullnac 



Tribe Dolichopezini 



The genera of the tribe Dolichopezini may be separated in accordance 

 with the following key: 



1. Tip of vein Ri atrophied; Rs wery short, transverse, simulating a cross-vein; second anal 



vein long, about two-thirds the length of the first; Sc moderate in length, ending 



mR 2 



Tip of vein Ri present, the vein almost perpendicular to /:?2+3 at its origin; Rs long, strongly 

 arcuated at its origin; second anal vein very short, about one-third the length of the 

 first; Sc very long, ending in costa Hrachiiprvmnn C). S. (p. !)2^) 



2. Cell 1st Mi lacking; basal deflection of Cui in a long fusion with M , breaking away 



before the fork of M DoUchopcza Curt. (p. •)2'.t) 



Cell Isi M« present; basal deflection of Cui in punctiform contact with Mi+i beyonil 

 the fork of M Oropeza Needm. (p. y2<)) 



Genus Brachypremna Ostcn Sacken 



1886 Brachypremna 0. S. Berl. Ent. Ztschr., vol. 30, p. 161. 



The genus Brachypremna includes but seven described species, all of 

 which are tropical American. A single species, B. dispellens, ranges 



