Descriptions of North American Trypetid?e, 



with Notes. 



BY \V. A. SNOW. 



PAPER 1. 



( With Plates VI and VII. ) 



In the fellowing pages I have preferred to consider six as the 

 number of segments composing the abdomen of the female Trypetid, 

 and five as composing that of the male. Loew united the first 

 two segments and called them the first (Monograph I, p. 54), allow- 

 ing five segments to the female and four to the male. However a 

 discrepancy occurs in his description of Trypeta palposa (1. c, p. 74) 

 wherein he speaks of the fifth segment of a male specimen. Where 

 the ovipositor is spoken of below, the first joint alone is meant. 

 First vein, second vein, etc., denote first longitudinal vein, second 

 longitudinal vein, etc. 



The material used in the preparation of this paper belongs to the 

 museum of the University of Kansas. I have also had access to 

 types of exotic forms in Dr. Williston's collection, and I wish to 

 make a grateful acknowledgment to him for this and many other 

 favors and suggestions. 



All specimens with habitat of Connecticut are of Williston's collect- 

 ing; those from California of Baron's. 



Epochra canadensis Loew (Pi. VI, f. 6). 



One male (Maine) in poor preservation apparently belongs here. 

 The wing agrees with the description; the stature of the body can 

 hardly be called "short and rather broad;" the scutellum has four 

 bristles. Loew was in doubt whether the normal number of bristles 

 on the scutellum was four or six. The reddish abdomen is black at 

 the base and on the two distal segments, but this coloring has much 

 the appearance of being the result of dessication. 



Straussia longipennis Wicd. 



Three females from Connecticut, are Loew's variety perfecta. In 

 one of them the median dorsal stripe of the thorax is not blackened 



(159) KAN. UNIV. gUAR. VOL. VOL. II. NO. 3, 1894. 



