178 



NEW YORK STATE MUSEUM 



Prionellus dilatata Felt 



1907 Felt, E. P. N. Y. State Mus. Bui. no, p. 149 (Campylomyza) 



1908 N. Y. State Mus. Bui. 124, p. 316 (Campylomyza) 



1909 Ent. Soc. Ont. 39th Rep't, p. 44 (Campylomyza) 



This species was reared by the late Dr M. T. Thompson of 

 Clark University, Worcester, Mass., from a vial containing decay- 

 ing vegetable matter and seeds. 



Male. Length 1.5 mm. Antennae nearly as long as the body, 

 sparsely haired, fuscous yellowish ; 14 segments, the fifth with a 

 stem as long as the subglobose basal enlargement ; terminal segment 

 reduced, pyriform. Palpi; the first segment short, stout, irreg- 

 ularly oval, the second a little longer, more slender, the third slightly 

 longer than the preceding and the fourth one-half longer than the 

 third, strongly flattened; face fuscous yellowish. Mesonotum dark 



Fig. 47 Distal abdominal segments and ovipositor of Prionellus 

 tsugae, enlarged. (Original) 



brown. Scutellum yellowish, postscutellum fuscous yellowish. 

 Abdomen a variable fuscous yellowish. Wings hyaline, costa light 

 brown, subcosta uniting with the anterior margin near the middle. 

 Halteres pale yellowish. Legs a nearly uniform light fuscous yel- 

 lowish ; claws long, strongly curved, denticulate, the pulvilli as long 

 as the claws. Genitalia; basal clasp segment broad, truncate and 

 with a long, roundly triangular lobe at the internal distal angle; 

 terminal clasp segment short, stout, greatly dilated, subtriangular ; 

 dorsal plate narrow, tapering, narrowly rounded. Harpes stout, 

 the distal margin bearing a pair of long, stout, recurved, teeth. 



Female. Length 2 mm. Antennae extending to the base of the 

 abdomen, sparsely haired, light fuscous yellowish; 13 segments, 

 the fifth subsessile, subcylindric ; with a length one-half greater than 



