78 THE CANADIAN ENTOMOLOGIST 



Haiiiiiioiiiyia Rondani 



Generic characters : Head more or less buccate, parafacial in profile 

 at least as wide as third antennal segment; distance between vibrissae not 

 greater than distance of either from nearest eye-margin ; abdomen in both sexes 

 cylindrical or snbcylindrical ; female genitalia usually with two or more strong 

 curved apical spines; hind tibia with at least three antero-and posterodorsal 

 bristles; wnng-veins 3 and 4 convergent apically; frons of female always less 

 than one-third of the head-width, with or without interfrontal bristles. 



Key to Species. 



1. Legs entirely black, or only the knees reddish; arista with very short hairs, 



the longest not as long as its basal diameter 2 



Legs with at least the tibiae entirely or in large part reddish ; arista with its 

 longest hairs longer than its basal diameter; prealar bristle absent. . . .3 



2. Prealar bristle absent ; mid tibia without a ventral bristle beyond middle ; 



abdomen with a series of dorsocentral brown spots and a brown spot 

 at each anterior angle of each tergite maciilata Stein 



Prealar bristle present; mid tibia in both sexes with one or two ventral 

 bristles beyond middle ; abdomen with a dorsocentral black vitta 

 paludis Johannsen 



3. Abdomen with a slightly interrupted central vitta and a large brown spot 



on lateral margin of each tergite; cross-veins of wings slightly in- 

 fuscated, the outer one nearly vertical, its upper extremny very 

 noticeably further from wing margin than its lower; female with a 

 ventral bristle on mid tibia johnsoni Stein 



Abdomen with a complete dorsocentral vitta and a poorly defined area on 

 anterior lateral angle of each tergite fuscous ; cross-veins not inf us- 

 cated, outer one oblique, its upper extremity not much further from 

 wing margin than its lower marylandica Malloch 



Pogonomyza Schnabl and Dzeidzki. 



The species of this genus have the legs entirely black; proboscis very 

 much thickened, as thick as or thicker than the fore femora; the hind tibia 

 with more than two posterodorsal and anterodorsal bristles, and in male with- 

 out a fringe of fine hairs and without a blunt posterior spine at apex of fore 

 tibia. 



All the species are northern in their distribution. One species, flavipennis, 

 occurs commonly in Europe in the fall on flowers of knapweed, thistles, and rag- 

 weed, and is found in New England and eastern Canada. There are some 

 North American species still undescribed. The larval habits are unknown to me. 



Key to Species. 

 L Hairs of arista very long, much longer than width of third antennal seg- 

 ment ; prealar bristle very short flavipennis Fallen 



Hairs of arista very short, not longer than its basal diameter 2 



