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



emarginate; ocellar basin distinctly defined, lateral walls 

 not very sharply raised; saw-guides robust, obliquely 

 truncate at tip; body light yellow or pallid, with spot 

 connecting ocelli, antennas above, and anterior edge of 

 cenchri, dark brown or black; lobes of mesonotum and 

 head above, brownish purple; stigma yellow. Length 8 mm. 



pinguidorsum 



34. Procidentia very broad and large 35 



Procidentia narrow, sometimes almost obsolete 36 



35. Head including orbits black; clypeus shallowly and broadly 



emarginate; sides of ocellar basin and frontal area rounded, 

 indistinct; procidentia very broad, one-third as wide as 

 last segment, rounded at tip, strongly constricted basally; 

 body black, with clypeus, mouth-parts, angles of pronotum, 

 tegulas, narrow lateral margin of abdomen, posterior mar- 

 gin of central segments, two terminal segments, venter of 

 abdomen, and legs, yellowish ferruginous; apices of poste- 

 rior tibiae and their tarsi black. Length 6-7 mm longicomis 



Head with orbits reddish; procidentia very broad, as broad as 

 long, constricted at base; body black or brownish, with 

 mouth-parts, pronotum, tegulae, base of costa, legs except 

 tips of posterior tibiae and their tarsi, abdomen beneath, 

 and more or less of the sides of the tergum, luteous; orbits, lat- 

 eral lobes of mesonotum, and basal edges of scutellum, 

 more or less rufous. Length 6 mm ribesi 



36. Pectus black y] 



Pectus and venter of abdomen pale 43 



2,T. Abdomen with the venter black 38 



Abdomen with the venter pale 42 



38. Legs pale except tips of posterior tibiae and their tarsi 39 



Legs entirely pale; clypeus broadly emarginate, almost trun- 

 cate; frontal crest very large, strongly angled anteriorly; 

 ocellar basin with lateral walls tapering rapidly posteriorly; 

 median fovea narrow, breaking slightly through the frontal 

 crest; third antennal segment slightly shorter than fourth 



or fifth; procidentia short, not very broad, rounded at 

 apex; body black, with clypeus, mouth-parts, extending to 

 eyes, narrow line on venter of abdomen including hypo- 

 pygium, and legs, ferruginous yellow; coxae black at 

 base. Length 5.5 mm dubia 



39. Clypeus distinctly emarginate ; procidentia minute 40- 



Clypeus nearly truncate; procidentia long and projecting, 



keeled ; body colored as in female, except that the abdomen 

 is wholly black, and the legs yellowish except tip of posterior 

 femora and apical half of posterior tibiae. Length 5.5 mm. 



dyari 



