NORTH AMERICAN HYMENOPTERA. 183 



pubescence; head and thorax above with a shoi't, pale fuscous pubescence, that 

 on the thorax on sides and beneath sparse and pale; wings hyaline, slightly 

 tinged with yellowish basally and along costa, and a small fuscous dot in the 

 marginal, at the apex of its append iculation. and at apex of the submarginal cell, 

 stigma black, nervures brownish. Length 10-11 mm. 



% . — Clypeal teeth a little more prominent than in the 9 : posterior face of 

 middle segment more rugose, the longitudinal, central furrow stronger and longer, 

 lateral ridges better developed and extending farther and margined outwardly 

 by a strongly foveolated furrow ; episternal suture of niesopleuric more strongly 

 foveolate ; head and thorax nun-e closely punctured ; greater part of fore femora, 

 spot on each side of the sternum anteriorly sometimes wanting and joints 1-3 or 

 4 of tlagellum beneath, yellow. Length 9 mm. 



New Jersey in July; District of Columbia (Ashmead) ; Illinois: 

 Algonquin (Nason). The shining body, widely separated maculae 

 on abdomen and ])unctuation of head and thorax sparser than in 

 other species will etfectively distinguish this species. 



62. Crabro veiitralis n. sp. 



9 • — Anterior margin of clypeus with an indistinct tooth medially, and with a 

 somewhat moi-e prominent one on each side ; head finely and very closely punc- 

 tured, the posterior lateral angles more prominently angular than usual when 

 viewed from the side ; furrow running from the frontal depression to the fore 

 ocellus distinct, but not very strong; pronotum strongly developed above, ap- 

 pearing as a large, transverse fold or swelling; dorsulum punctured about like 

 vertex, perhaps a little more strongly so ; scutellum more finely and sparsely 

 punctured ; episternal suture of mesopleurse scarcely foveolate ; enclosure of 

 middle segment with a strong, transverse foveolated furrow at base, the width 

 of which varies somewhat, the central longitudinal channel is also variable in 

 width, and has one or more longitudinal ridges, posterior face rugose at apex, the 

 lateral ridges only distinct on apical half, obsolete above; middle and hind tibiiB 

 with short, strong spines; abdomen above very finely punctured, most sparingly 

 so on first dorsal and beneath ; punctuation of pygidial area variable, sometimes 

 with large, coarse punctures and again impunctate. Black ; mandibles except 

 apex, two spots on clypeus, scape entirely, pedicellum beneath, pronotum above, 

 a spot on the dorsulum at each side anteriorly, scutellum and a small spot at each 

 anterio-lateral angle, a spot on each convexity of the enclosure of middle seg- 

 ment, tubercles, most of tegula;, episteruum mesopleuralis, spot at apex of coxae, 

 trochanters (the coxfe and trochanters are sometimes black), tips of the femora, 

 the anterior and medial pairs most broadly, the tibiae, except a spot at apex of 

 hind pair, one or two (or three) basal joints of tarsi, a transverse band on dorsal 

 abdominal .segments 1-5 and the greater part of ventrals 2-5, yellow ; clypeus, 

 inner orbits beneath and cheeks with a silvery pubescence, not dense, however ; 

 wings with a yellow tinge, nervures yellow testaceous, stigma black ; thorax 

 beneath with a short, pale fuscous, sparse pubescence. Length 9-10 mm. 



Nevada. The coloration will distinguish this from the other 

 species of the group. 



TKANS. AM. ENT. SOC. XXII. JUNE, 1895. 



