310 E. T. CRESSON, JR. 



a rupture-like depression at base on right side ; intermediate 

 lobe visible at sides; ventral lobe small. Legs slender; 

 apical and basal post-tarsal joints in proportion of 1 : 3.5 ; 

 claws shorter than apical joint. Stigma with only apical part 

 colored. The conical process of the fourth ventral segment 

 is white and somewhat globular. I think it is an effect of 

 some injury. The claws are unusually short in this species. 

 The hypopygium may be considered cleft or not, perhaps 

 depending upon the amount of development. The stigma is 

 partly colored, the basal half at least hyaline. 



Group III. 



Stigma hyaline and generally very small. 



36. P. albofasciatus Hough. 



d 1 . Front and face silvery or the former yellowish ; occiput cinere- 

 ous or brownish. Antennae black, long acuminate (Fig. 42), more or 

 less sericeous. Mesonotum subopake, brownish ; scutellum more shin- 

 ing ; pleura? and metanotum cinereous, the latter densely so. Humeri 

 yellow ; halteres black or brown. Abdomen broad, subopake, brown- 

 ish, with apex of first, ventral margins of following, and large lateral, 

 more or less coalesing spots on fifth segments, cinereous; fifth longer 

 than fourth. Hypopygium slightly more shining, large, symmetrical, 

 longer than, and as broad as, fifth, semi-circular from dorsal aspect ; 

 cleft on left side (Figs. 96-97); intermediate and ventral lobes just 

 visible from above. Legs black, with apices of femora, broad apices 

 and bases of tibiae, and most all tarsi, yellow ; spines minute; claws 

 about as long as joint, which is about one-third as long as basal joint. 

 Wings small, nearly hyaline (Fig. 188). Length, 4.0 mm.; wings, 

 4.3 mm. 



9 . Similar. Front entirely shining, or, silvery at antennae, sixth 

 ^abdominal segment also with two cinereous spots ; all segments sub- 

 equal in length, except sixth a little longer. Ovipositor very slender 

 (Fig. 98), rufous, extending to apex of second, rather abruptly termi- 

 nating its black retracted base ; basal joint of tarsi somewhat shorter. 

 Wings hyaline (Fig. 189). 



Described from Louisiana ; also reported from New Jersey 

 (1899 Smith 665). Before me are the following which I con- 

 sider belong here: Burlington, Vt., 1 d 1 (Figs. 42, 188); 

 Waltham, Mass., 1 c? (Figs. 96-97); Hampden, Me., 1 9 

 (Figs. 98, 189) (all by Johnson, B. S. N. H.)\ Woburn, Mass. 

 (19, Barlow, B. S. N. H.). Taken June and July. 



