308 E. T. CRESSON, JR. 



One female. Machias, Me. July 20, '07 (Johnson, B. S. 

 N. H.). 



Closely allied to the nitidiventris-gi oup, but differing in 

 having the antennae yellow. 



33. P. houg'lii Kertesz = lateralis || Walker. 



cf. Front and face and occiput, white. Palpi, proboscis and third 

 joint of antennae yellow, latter acute and white pilose (Fig. 25); arista 

 black. Mesonotum shining, more or less obscured by thin brown 

 pollen, not pilose. Scutellum subopake, concolorous. Pleurae and 

 metanotum less shining, lightly cinereous. Halteres and humeri yel- 

 low. Abdomen subcylindrical, somewhat flattened, segments 2-4 sub- 

 equal, fifth longer, with two indentations on dorsum ; entirely black, 

 or yellowish laterally, shining except the first segment, which is cin- 

 ereous ; venter black, or yellowish. Hypopygium little developed, 

 more or less assymetrical (one of the specimens has it compressed 

 to the right, the other not noticeably so); cleft distinct, without keel 

 (Fig. 82); intermediate lobe visible from above; ventral lobe small, 

 brownish. Legs entirely yellow, but bases of coxae and apices of tarsi 

 brownish ; femora slender ; post-tibiaB dilated and slightly bent. Wings 

 grayish (Fig. 179), with colored stigma. Length, 4.4 to 5.9 mm.; 

 wings, 5.6 to 6.3 mm. 



9 . Front shining at vertex. Base of ovipositor globose, hardly longer 

 than fifth segment ; ovipositor stout, yellow, and very short, about 

 three-fourths as long as its base (Fig. 83). The basal joint of post- 

 tarsi distinctly flattened or compressed, also the following joints to 

 some extent, and extending in form of teeth apically, giving strong 

 serrations ; the margins as well as the under surfaces, and the apical 

 mesal surface of the tibiae, distinctly scopate. 



Described from North America ; also reported from 

 Florida (1896 Johnson 331). Before me are the following, 

 which I consider as belonging to this species : Burlington, 

 Vt. (1 9, Figs. 24, 83); Auburndale, Mass. 1 o 71 (both by 

 Johnson, B. S. N. H.); Ithaca, N. Y. (1 9 , coll. Banks); Rox- 

 borough, Pa. (1 d\ Figs. 25, 82, 179, Greene, A. N. S.); 

 North Mt., Pa. (1 d 1 , coll. Johnson). Swarthmore, Pa. (1 cf, 

 Cresson, A. N. S.); Bay Ridge, Md. (1 d\ coll. Banks). 

 Taken April to August. 



This species is readily distinguished by its entirely shin- 

 ing abdomen, and slender yellow legs. I cannot separate 

 pallipes Johnson, from this species, except in its smaller size 

 (3.5 mm.). The above forms, with yellowish tinge on sides 

 of abdomen, seem to be only varieties of this species. 



