70 CONNECTICUT GEOL. AND NAT, HIST. SURVEY. [Bull. 



put and posterior orbits; body dull black; wings infus- 



cated. Length ii mm polysericeus 



Punctures on scutellum similar in size and arrangement to 

 those of lateral lobes of mesonotum 8 



8. Vertical furrows obsolete; mesonotum with impunctate area 



on lateral surface of lateral lobes extending to median 

 lobes; postocellar area more closely punctate than pos- 

 terior orbits; posterior orbits not with a ridge extending 

 from antennal furrow to eye; median lobe of mesonotum 

 and scutellum more deeply and distinctly punctate than 

 lateral lobes; wings fuliginous, veins and stigma black; 



body black. Length lo mm tectus 



Vertical furrows deep and distinct 9 



9. Mesonotum with the impunctate area on lateral surface of 



lateral lobes not extending to median lobe; postocellar 

 area and posterior orbits uniformly punctate; posterior 

 orbits with a fine ridge extending from posterior end of 

 antennal furrow to eye; median lobe of mesonotum finely, 

 densely punctate; body uniformly black; wings fuliginous. 



Length 14 mm colosericeus 



Mesonotum with impunctate area on lateral surface of lat- 

 eral lobes extending to median lobe; the postocellar area 

 more finely punctate than posterior orbits; posterior orbits 

 not with a fine ridge extending from antennal furrow to 

 eye; median lobe of mesonotum finely, densely punctate; 

 body uniformly black; wings fuliginous. Length ID mm. 



monosericeus 



ID. Vertical furrows continued as broad distinct furrows to near 

 middle of eyes; mesonotum with impunctate area on lateral 

 surface of lateral lobes not extending to median lobe; 

 postocellar area with many fine punctures, and posterior 

 orbits with adjacent large punctures, subrugose; body en- 

 tirely black, except abdominal segments one to five which 

 are rufous; wings infuscated on apical half. Length 12 



mm apriloides 



Vertical furrows not continued below lateral ocelli; mes- 

 onotum with the impunctate area of lateral surface of lat- 

 eral lobes extending to median lobe; postocellar area and 

 posterior orbits finely punctate, postocellar area more 

 densely; body black, with abdominal segments one to five 

 rufous; wings hyaline, smoky toward the apex. Length 1 1 

 mm. neoaprilis 



II. Head with a distinct carina between occiput and posterior 



orbits 12 



Head not with a distinct carina between occiput and posterior 

 orbits 13 



