ZooL.— Vol. II.] WHEELER— DOLICHOPODID^. 41 



Parasyntormon, gen. no v. 



Species in general shape and coloration resembling species of Sympycnus. 

 Face of male narrow. Antennae inserted high up, large; first joint without 

 hairs on its upper surface, rather long, usually with a blunt ventral projection 

 near its tip; second joint overlapping the third on the mesial side with a 

 thumb-shaped lobe; third joint large, flattened, of variable shape, usually 

 longer than broad, distinctly pilose; arista dorsal, subapical or apical, long, 

 more or less pubescent. Thorax convex behind, with prominent dorsal 

 bristles; acrostichal bristles in a single row. Scutellum with only two bristles. 

 Abdomen slender, laterally compressed, basal segments largely yellow in 

 most of the species. Hypopygium small, embedded, only the small append- 

 ages projecting. These consist of a pair of anteriorly directed club-shaped 

 organs with few hairs and a pair of hirsute posterior appendages, each of 

 which terminates in a long hair. Wings distinctly narrowed towards their 

 bases. Third vein gradually bent down towards the tip till it approaches the 

 end of the fourth vein, which is as gradually bent up and terminates in the 

 tip of the wing. Posterior cross-vein short, about one-third or even less than 

 the length of the distal segment of the fifth vein, thus making the discal cell 

 very short and narrow. Legs slender, hind pair longest; hind metatarsus 

 without bristles, shorter than the succeeding joint; middle and hind legs plain 

 in all of the known species; fore tarsi similarly modified in the males of all 

 the species as follows: first joint slender, as long as the remaining joints taken 

 together, bearing a row of three or four black bristles on its plantar surface 

 near the base; second, third, fourth and fifth joints very short, subequal; sec- 

 ond joint distinctly incrassated, third with a small recurved bristle on its 

 plantar surface near the base. Antennae of female much smaller than those 

 of the male, overlapping lobe of second joint much shorter; third joint scarcely 

 longer than broad, roundish angular in outline, with short, distinctly dorsal 

 arista. Face and legs plain, the former somewhat broader than in the male. 

 Wings not narrowed towards their bases. 



The six species seem to be restricted to the Western 

 United States. They may be distinguished as follows: — 



1. Second and third abdominal segments largely yellow 2 



Abdomen entirely cupreous asellus, sp. nov. 



2. Third antennal joint of male quadrilateral, with truncated tip. 



occidentale ( Ald. ) 

 Third antennal joint of male pointed 3 



3. Arista of male distinctly dorsal 5 



Arista of male subapical 4 



4. Basal joint of antenna largely yellow lagotis, sp. nov. 



Basal joint of antenna black hinnulus, sp. nov. 



5. Arista inserted near the tip of third antennal joint. 



einarginatuni, sp. nov. 

 Arista inserted half-way between the base and tip of third anten- 

 nal joint montivagunt, sp. nov. 



