178 NEW YORK STATE MUSEUM 
Prionellus dilatata Felt 
1907 Felt, E. P. N. Y. State Mus. Bul. 110, p. 149 (Campylomyza) 
1908 —_———— _N. Y. State Mus. Bul. 124, p. 316 (Campylomyza) 
1000) nt Soc. Ont sot inepit sp. 445 (Camipylonmnyzay) 
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 
