138 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BulL 



8. Body in great part black with pale markings 9 



Body in great part resinous with black markings 11 



9. Antennae with third segment longer than fourth; clypeus 



deeply emarginate, lobes somewhat pointed; ocellar basin 

 sharply defined; saw-guides elongate, narrow, regularly 

 tapering; body black, with apical half of clypeus, mouth- 

 parts, angles of pronotum broadly, tegulae, and legs for the 

 most part, light yellow; venter of abdomen yellowish, 

 strongly infuscated. Length 5 mm populi 



10. Surface of body shining, entirely without pubescence; ocellar 



basin distinctly defined, with rounded walls; frontal crest 

 rather sharp and unbroken; median fovea oval and dis- 

 tinctly defined; saw-guides moderately broad, regularly round 

 at tip; body black, with orbits and face brownish yellow; 

 pronotum, tegulae, legs for most part, and venter of abdo- 

 men, yellowish or resinous; apical half of abdomen of 

 female above, yellow; procidentia not longer than wide. 



Length 4.5 mm censors 



Surface of the body clothed with minute yellowish hairs, 

 I especially evident on thorax; ridges of ocellar basin al- 

 most obsolete; frontal crest well developed; median fovea 

 minute, oval; saw-guides narrow, elongate, regularly tapering 

 or slightly excavated beneath, clothed with short black 

 hairs; body black, with the inner orbits narrowly, and the 

 cheeks, resinous, strongly infuscated; supraclypeal area, 

 mouth-parts, pronotum, tegulae, legs in great part, and 

 central area of venter of abdomen, resinous infuscated. 

 Length 4 mm borealis 



11. Stigma broad, rounded on lower margin; body resinous, with 



base of antennae, space about ocelli, stripe on each lobe 

 of mesonotum, apex of scutellum, metanotum, dorsal seg- 

 metrts of abdomen except the last, extending over sides, large 

 spot on pectus, and saw-guides, brownish black-, clypeus 

 broadly and shallowly emarginate ; ocellar basin sharply and 

 distinctly defined ; antennas with third segment a little shorter 

 than fourth; saw-guides stout and broad basally, slightly 

 emarginate on lower apical edge, tip obtusely rounded. 



Length 5 mm pectoralis 



Stigma narrow, acuminate; body resinous, with antenna, 

 spot on head back of ocelli extending over occiput, center 

 of lobes of mesonotum, apical half of scutellum, meta- 

 thorax, basal plates, more or less of abdomen basally 

 and centrally to apex, and saw-guides, black ; clypeus shallowly, 

 somewhat angularly notched; ocellar basin with its walls 

 low; antennae with segments three and four subequal; 

 saw-guides broad, slightly concave on upper margin, and 



