288 E. T. CRESSON, JR. 



167) hyaline; colored stigma equalling or longer than fourth section. 

 Length, 4.4 mm. ; wings, 5.0 mm. 



There are also three females from : Manomet, Mass. {John- 

 son, B. S. N. H.); Ithaca, N. Y. (Figs. 3, 55, coll. Banks); 

 and Glencarlyn, Va. (Figs. 54, 167, coll. Banks). Taken in 

 June and July. These probably belong to the foregoing 

 males, although there may be two distinct species, one of 

 which is represented by the specimen from Glencarlyn, seem- 

 ing to differ in the shape of the ovipositor (Fig. 54). 



9 . Front with a raised shining longitudinal area above, attenuat- 

 ing anteriorly; lower part and face silvery; antennas (Fig. 3) acumi- 

 nate. Mesonotum subopake, brownish ; lateral margins of pleurae and 

 metanotum cinereous, the latter more whitish. Abdomen subopake, 

 brownish pollinose with apex of first segment narrowly white ; ventral 

 margins and lateral angles, becoming thinner dorsally, or in some 

 aspects entire apical margin of segments 2-5, and nearly all of sixth, 

 cinereous; extreme bases of all segments opake-brown or black; second 

 to fourth segments subequal in length. Base of ovipositor cinereous, 

 elongate-conical (Fig. 55), tapering into the long slender, straight, 

 yellow ovipositor, which extends to middle of thorax. Wings short, 

 hyaline. Length, 4.4 mm. ; wings, 4.4 mm. 



The species as here designated may be distinguished by 

 its nearly totally black appearance contrasted by the silvery 

 band on first segment of abdomen and the complete apical 

 subopake or grayish bands of following segments. I am 

 not at all satisfied with this determination. There seems 

 to be, at least, two distinct species here. 



9. P. semifasciatus n. sp. 



o" . Front and face silvery ; occiput brownish to cinereous ; antennae 

 black, acute, similar to nigripes (Fig. 3). Mesonotum and scutel- 

 luni subopake, brown pollinose. Pleurae and metanotum cinereous ; 

 humeri and halteres black, latter with pedicles brown. Abdomen 

 short, hardly longer than thorax ; first segment white apically ; follow- 

 ing segments opake-brown with apices and lateral angles subopake 

 cinereous, broadly interrupted medianly, the interruptions diminishing 

 in width successively, so that on the apical segments the basal brown 

 portion just reaches the apices of segments in middle ; venter opake- 

 black. Hypopygium large (Fig. 47) , rather shining and faintly brown- 

 ish ; intermediate lobe rather unusually developed below, and more or 

 less wrinkled ; terminal lobe with cleft, far to right, having a distinct 

 appendage ; ventral lobe black, not much developed. Legs black ; 

 trochanters brown ; extreme apices of femora, bases of tibiae and tarsi, 



