No. 22.] HYMENOPTERA OF CONNECTICUT. 53 



less infuscated; hind trochanters, tibiae and tarsi, some- 

 times infuscated, white. Length 7 mm maculata 



17. Clypeus black, heavily punctate 18 



Clypeus white, smooth or finely punctate 22 



18. Clypeus distinctly emarginate 19 



Clypeus truncate; antennal furrows adjacent to antennal 



fovea well marked; ocellar furrow linear, distinct; inter- 

 ocellar furrow broad and deep; third segment of antennae 

 distinctly longer than fourth; saw-guides convex above, 

 convex below, broadly converging to a blunt point just 

 above the middle of apex; body black, with front and mid- 

 dle legs below the middle of femora, and base of tibiae, 

 ringed with white. Length 7 mm cauduca 



19. Interocellar furrow extending each side of median ocellus, 



forming an inverted Y-shaped furrow 20 



Interocellar furrow extending only to median ocellus, form- 

 ing only the stem of the Y; median fovea a rounded scar; 

 clypeus with median tooth almost as long as lateral lobes, 

 all angular, appearing tridentate; ocellar and interocellar 

 furrows linear, deep; third and fourth segments of anten- 

 nae subequal; saw-guides convex above and below and 

 slightly obliquely rounded at apex, the lower angle more 

 rounded than the upper; body black, with collar, tegulae, 

 front and middle femora beneath at apex, front tibiae, mid- 

 dle tibiae beneath, and a ring at the base of the hind tibiae, 

 white. Length 6 mm castigata 



20. Median fovea a rounded depression 21 



Median fovea a wedge-shaped depression; clypeus with tooth 



and lobes pointed; ocellar furrow faint; interocellar fur- 

 row distinct; postocellar area with a median furrow; 

 antennae with third and fourth segments subequal; body 

 black, with collar, tegulae, apical half of front and middle 

 femora, their tibiae, and knees of hind legs, all more or 



less infuscated, white. Length 6 mm casca 



21. Median fovea a minute pin-hole pit; front flat adjacent to the 

 fovea; clypeus with a small median tooth and lateral lobes 

 broadly rounded; ocellar and interocellar furrows deep 

 and distinct; third segment of antennae slightly longer 

 than fourth; saw-guides straight above, and the lower 

 margin and apex broadly obliquely rounded to a point 

 at the apex above; body black, with collar and tegulae 

 white; legs beyond the middle of femora brownish infus- 

 cated. Length 6 mm ignota 



Median fovea a broad pit with flaring sides; clypeus with a 

 fine, median carina, median tooth short, lateral lobes 

 broadly angular; ocellar furrow linear, interocellar fur- 



