284 E. T. CRESSON, JR. 



bases ; tarsi black-brown, with joints 1-2 yellowish ; third 

 section of fourth vein twice the second. This shows but 

 little variation from these males. This species as here re- 

 presented is distinguished by its small size, non-cleft hypo- 

 pygium, short ovipositor, and black femora. 



3. P. dubius n. sp. 



cf . Bare, entirely black, except humeri brown, squamulae yellow, 

 halteres brown, pedicle yellow, extreme apices of femora, extreme 

 bases and apices of tibiae, yellow, basal joint of tarsi brown ; antennae 

 (Fig. 30) rather abruptly short acuminate. Front and face silvery; 

 occiput cinereous and brown. Mesonotum opake, brown pollinose ; 

 pleurae and metanotum lightly cinereous. Abdomen opake to sub- 

 opake ; the narrow apical margins dilating into the broad ventral 

 angles of segments 1-5 cinereous, semi-opaque , the broad bases of 

 segments 2-4 brownish black becoming opake at extreme bases ; fifth 

 more shining, broadly cinereous tinged, brownish at base ; hypopy- 

 gium (Fig. 58) shining black, but faintly cinereous, small rather 

 symmetrical, not cleft, but intermediate lobe fully visible, ventral 

 lobe little developed, brownish. Legs rather slender, mostly black and 

 cinereous, with inner surface of post-femora polished ; spines weak. 

 Wings (Fig. 138) grayish hyaline; stigma colored. Length, 2.8 mm.; 

 wings, 3.8 mm. 



9 . Front entirely shining, except just above antennae ; antennae 

 (Fig. 31) long acuminate; halteres yellow or with brownish knobs. 

 Abdomen short, broadest at third and fourth segments, subopake, 

 bluish-gray, with extreme bases of segment opake-brown ; all are 

 subequal in length, but sixth longer, grayish, and deeply grooved 

 medianly, so much so as to make it appear to be composed of two 

 separate plates. Ovipositor (Fig. 59) slender, brownish, abruptly thick- 

 ened basally, extending to base of abdomen ; articulated with, and 

 abruptly terminating its subglobose grayish base. Only extreme base 

 of tibiae yellow ; the tarsi are entirely black. Stigma of wing only 

 colored at apical portion ; the second section of fourth vein varying in 

 the two specimens from ^ to nearly ^ of third section. 



Type.— <?. Capens, Maine, July 15, 1907 (Figs. 30, 58, 

 138, Johnson, B. S. N. H.). 



Paratypes. — Capens, Maine, 3 cfs, 1 9, Fig. 31; Machias, 

 Maine, 1 9 , Fig. 59 ; Burlington, Vt., 1 o" (all by Johnson, 

 B. S. N. H.); Kingston, R. I. (2 c?s, Barlow, B. S. N. H.). 

 Taken in June and July. 



The male, from Burlington, Vt., has slight variation in 

 the cinereous coloration of the abdomen, being less pro- 



