No. 22.] HYMENOPTERA OF CONNECTICUT. I25 



5. Head, thorax, and abdomen black above; ocellar basin well- 



defined; frontal crest slightly notched at center; antennal 

 segments three and four subequal; saw-guides broadly 

 rounded on lower margin, pointed at tip; body black, with 

 the area above bases of antennas, postgenae, orbits, mouth- 

 parts, pronotum, tegulse, legs in great part, and venter of 

 abdomen, pale; remainder of legs, veins, and stigma brown. 



Length 8 mm lata 



Head and thorax black, abdomen more or less pale 6 



6. Abdomen with broad, lateral, pale stripe; sides of ocellar 



basin strongly and sharply raised; median fovea small, in- 

 distinct; frontal crest very prominent, broadly curved, un- 

 broken; saw-guides short, broad, obtusely pointed; body 

 black, with clypeus and mouth-parts, most of pronotum, 

 tegulse, lateral third of dorsum of abdomen, all of venter 

 of abdomen, and legs, yellowish ferruginous; upper orbits 

 and sides of mesonotum tinged with reddish. Length 7 mm. 



limbata 

 Abdomen with a broad, transverse, yellow band; sides of 

 ocellar basin and frontal crest strongly raised; median 

 fovea large, oval, deeply excavated; antennal segments 

 three and four subequal; saw-guides moderately robust, 

 obtusely pointed, with straight upper margins ; body black, 

 with tip of clypeus, labrum, bases of mandibles, palpi, 

 and basal half of hind tibiae, whitish; upper margin of prono- 

 tum, tegulae, dorsum of four basal abdominal segments except 

 apex of fourth, all of venter, and legs, yellowish ferruginous. 

 Length 8 mm latif asciata 



7. Head and thorax black 8 



Head and thorax in great part pale 19 



8. Abdomen with venter pale, dorsum always more or less 



black, except sometimes the apical segments 9 



Abdomen with venter and dorsum pale, except sometimes 

 the basal dorsal segments and rarely the terminal segments 12 



9. Femora all black; ocellar basin well defined; frontal crest 



large, indistinctly broken; antennae with third segment 

 slightly longer than fourth; saw-guides pointed, slightly 

 excavated above and rounded beneath; body brownish 

 black, with inner and outer orbits, face below base of an- 

 tennae, pronotum except two or three dusky spots, tegulae, 

 front femora, sometimes almost entirely, tips of femora 

 and tibiae, lateral edges of thorax and abdomen, and venter, 



yellowish white. Length 8 mm ventralis 



Femora wholly or in part pale 10 



10. Femora of front and middle legs pale, of hind legs black; 

 ocellar basin deep with well-defined walls; frontal crest 

 unbroken; median fovea large, triangular, deeply exca- 



