142 HYMENOPTERA ACULEATA. 



(SuBO. SOLENIUS.) 



C. vagus, Linn. — Black, head and thorax dull, hairy, 

 closely punctured, scape of the antennse, except the base 

 posteriorly, yellow ; antennse in the tj twelve-jointed, the 

 fifth joiut slightly and sixth deeply, sinuated beneath, 

 posterior ocelli very distant ; pronotum with a yellow spot 

 on each side of the collar, mesopleuraa transversely rugose, 

 wings rather dusky, propodeum with the basal area 

 indefinite, diagonally strigose or rugose, with a central 

 crenate furrow ; abdomen shining, finely punctured, ovate 

 in both sexeSj black, basal segment clothed with long hairs, 

 second, fifth, and sixth with a yellow spot on each side, 

 often united in the (J, third immaculate in the ?, rarely 

 with a small lateral spot in the $ , sixth in the c? yellow at 

 the base, apical dorsal valve of the ? narrowly acuminate, 

 sides clothed with long golden bristly hairs ; legs with the 

 femora black, their apices and the front of the anterior pair 

 usually yellow, tibias yellow, narrowly black at the apex, 

 and often black on the posterior side, tarsi dusky, pale at 

 the base in the $ , posterior and intermediate tibite dentate 

 and spinose in the ? . 



L. 10-13 mm. 



Common ; the entirely black third segment of the 

 abdomen gives this species a character by which it is easily 

 recognized. 



(SuBG. THYREOPUS.) 



C cribrarius, Linn. — Head and thorax black, and 

 rather densely hairy, the former finely punctured, and 

 strigose between the eyes, face widely impressed, antenna 

 in the c? fusiform, simple in the ? , with a yellow spot near 

 the apex of the scape, ocelli in an isosceles triangle ; 

 pronotum with two yellow spots in the ? , its angles sub- 

 spinose in the J', mesonotum rugosely punctured and 

 longitudinally striate in both sexes, scutellum yellow in the 



