84 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
black; third costal segment one half the fourth. Length 3.5 
to 4 mm ....... similis sp. nov. 
This species is very like P. sylvaticus Meig., from which its pol- 
linosity and the form of its hypopygium clearly separate it. The 
terminal segment of the ovipositor is straight, awl-shaped, and about 
as long as the hind tibiae. I have eleven males, collected by G. R. 
Pilate at Tifton, Ga., in Oct. and Nov., and two females, collected 
by C. F. Baker in Alabama. 
G. Tarsi yellow, only the last joint black .... 8 
8. Humeri yellow; front of male very small, silvery pollinose, 
without depression. Thorax and scutellum shining greenish 
black, dusted with brown pollen in the middle and towards the 
cephalic border. Hypopygium small, hardly half as long as 
the fifth segment; its rim a oblique and to the right of the 
median line. Terminal piece of ovipositor straight and about as 
long as the hind tibiae. Wings hyaline; veins black; fourth 
costal segment hardly twice the third. Abdomen greenish 
black, shining. Legs black; the very apex of the femora and 
base of the tibiae yellowish; tarsi brownish yellow, toward 
the tip black. Halteres with yellow knob and brownish ped¬ 
uncle ....... subvirescens Lw. 
In the Loew collection a single rubbed male. I have numerous 
specimens, of both sexes, from New Bedford, Mass., Tifton, Ga., 
and Opelousas, La. 
10. Males . . . . . . . . . 11 
11. Eyes not in contact, front not swollen. 
Shining black, lightly white pollinose. Abdomen with a large 
yellow spot on each side; fifth and sixth segments large. Legs 
and coxae yellow except the basal two thirds of anterior coxae 
black. Length 4 mm. 
Face and ventral half of front silvery pollinose. Antennae 
black, third joint yellow and very finely white pubescent, its apex 
prolonged in a white point. Thorax shining black, very lightly 
white pollinose especially near the humeri. Scutellum shining 
black. Metanotum and pleurae somewhat whitish gray pollinose. 
First abdominal segment black with a transverse yellow fascia at 
the cephalic border; second segment black except the caudo- 
lateral angles, which are yellow; incisure between second and 
third segments yellow ; third and fourth segments black on the 
middle of the dorsum, their sides almost wholly yellow; incisures 
