NORTH AMERICAN HYMENOPTERA. 



187 



15. Group minimus. 



Pj^gidium ( 9 ) broad, flat, not excavated ; ocelli foriniug an equi- 

 lateral triangle ; fore tarsi ( % ) not flattened, the ultimate abdominal 

 segment in that sex more strongly punctured than the penultimate ; 

 pronotum crested transversely. 



This group is identical with Croasocerm St. F. and Br. 



68. Crabro sulcus n. sp. 



5 . — Anterior margin of clypeus as in mcavus ; head finely punctured, the front 

 more distinctly ; a distinct, impressed line runs back from the fore ocellus ; first 

 joint of antennsB less than one-third longer than the second; pronotum rather 

 sharply crested, at the sides obtusely angular ; punctures of the dorsulum some- 

 what finer and more separated than those of the front; e.pisternal suture of 

 mesopleura; sinuous ; excavated basal portion of middle segment represented by 

 a strongly foveolated furrow, the longitudinal furrow of upper surface broad 

 basally, and much narrowed apically ; all the impressed lines or furrows of mid- 

 dle segment foveolate, except the longitudinal medial furrow of posterior face, 

 the lateral ridges of the latter with an inner and outer furrow, upper surface, 

 outside the enclosure, rather coarsely striated ; abdomen shorter than head and 

 thorax united, the first segment not meeting evenly with the second in conse- 

 quence of being slightly contracted at apex ; pygidium narrower at apex than in 

 incavm, flat as usual, with large, scattered punctures. Black ; apical portion of 

 mandibles reddish ; scape in front, two small spots on pronotum, fore tiliiai in 

 front and extreme base of medial and hind tibiie, yellowish ; rest of legs and 

 tegulfe, brownish testaceous ; clypeus, cheeks, sides of thorax and beneath sparsely, 

 with silve'-y pubescence ; legs and abdomen with a silvery sericeous pile ; wings 

 hyaline, iridescent, nervures and stigma brownish. Length 5 mm. 



Beverly, Massachusetts, July 13. From incavus this species differs 

 chiefly by the metathoracic characters and form of pygidium. The 

 color of legs is a good superficial character in distinguishing it. A 

 male specimen from Long Island, received from Mr. Ashmead, I 

 refer doubtfully to this species. The pronotum is very strongly an- 

 gular at the sides and strongly crested above and the base of the 

 middle segment is broadly excavated, somewhat as in incavus, and 

 longitudinally marked v/ith short .stride ; the mandibles are yellow. 

 Otherwise it resembles incavus very much. 



69. Crabro pictipes n. sp. 



/^ . — Head finely punctured, the front more distinctly so, but the diflerence is 

 not so marked as in some of the following species; anteunte rather long, not at 

 all clavate, the first joint of flagellum but little, if anything, longer than the 

 second ; pronotum rather strongly crested above, laterally angulate, though not 

 acutely ; dorsulum finely aud closely punctured ; epistemal suture of mesopleui-ae 

 obtusely angular at about the middle; middle segment fully as broad as in 

 incavus, coarsely striated and the medial, longitudinal furrow, which is very 

 broad at base, assumes a somewhat triangular form ; fore tarsi slightly flattened. 



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



