248 ENTOMOLOGICAIv NEWS [Nov., '19 



Two New Asyndetus with a Table of the North 

 American Species (Dolichopodidae, Diptera). 



By M. C. Van Duzee, Buffalo, New York. 



Table of Males. 



1 All tibiae partly or wholly yellow 2 



Hind tibiae black 5 



2 Fore tarsi modified; hind tibiae blackened at base 3 



Fore tarsi normal ; hind tibiae blackened at tip 4 



3 First joint of fore tarsi incrassated ammophilus Loew 



Second joint of fore tarsi with a clavate, haltere-like, yellow ap- 

 pendage appcndiculatus Loew 



4 Front and face very wide and covered with silvery pollen ; palpi 



black latus V. D. 



Ground color of the front and face showing through the white 

 pollen ; palpi rather large, white caudatus V. D. 



5 All tibiae black or brown 6 



Fore tibiae yellowish, sometimes the middle ones also 9 



6 Third antennal joint large, about twice as long as wide 7 



Third antennal joint rather small, but little longer than wide... 8 



7 Second antennal joint extending over the upper edge of third 



joint to near its middle occidcntalis sp. nov. 



Second antennal joint not extending beyond the base of third 

 joint nigripes V. D. 



8 Mesonotum with a brownish-dusted vitta, between two bluish gray 



ones fratellus Aid. 



Mesonotum not vittate interruptus Loew 



9 Third antennal joint somewhat quadrilateral in outline 10 



Third antennal joint not at all quadrilateral in outline, but with 



a point or rounued at tip 12 



10 Fore tibiae with only short hairs; third antennal joint but little 



longer than wide cornutus V. D. 



Fore tibiae with long bristle-like hairs on the whole upper surface ; 

 third antennal joint twice as long as wide; second joint extend- 

 ing to the middle of the third above, at which point the third is 

 attached 1 1 



11 Second antennal joint ending in a rounded tip near the middle of 



third joint, which is nearly straight ahowe. . . .syntormoides Wh. 



Second antennal joint ending in a sharp point at tip; upper edge 



of third joint concave harbeckii V. D. 



12 Third antennal joint rounded at tip; second joint reaching the 



middle of the third above longipalpis sp. nov. 



Third antennal joint rounded below, pointed at tip 13 



