Fossorial Hymcnoptera of North America. 105 



irregular fossae, no mesial furrow. Fore and middle femora broadly 

 tipped with yellow, hind pair black; two anterior pair of tibia? yellow, 

 streaked within by black lines, posterior pair tipped narrowly with 

 black ; anterior and middle tarsi yellow, posterior black. 



Abdomen long and narrow, equalling in length the head and thorax, 

 narrower than usual ; basal ring immaculate, four pairs of short ovate 

 non-sinuate fascia;, situated on the front edge of each ring; first pair 

 largest and broadest, three succeeding pairs longest and narrower? 

 Blightly indented on the posterior edge, equal in size ; third pair very 

 contiguous, fourth form a continuous band. 



Length of body, .25 ; bead and thorax together, 13 ; abdomen, .12 

 inch. 



New York, (Norton). 



Its narrow head, deep frontal impressed line, coarsely punctured 

 body, the absence of mesial furrow on the thoracic-abdominal ring, and 

 unusually coarse fossae on this segment, together with its slender 

 body and unusually narrow abdomen, the two pairs of fore femora 

 broadly tipped with yellow, form easy characters for discrimination. 

 The antenna? are also rather stout, but prominently toothed beneath, 

 and it will thus be distinguished from C. brunneipes and its allies. 



Crabro cubiceps n. sp. 



9 . This species is in form and structure allied closely to C. atri- 

 ceps, but the head is more cubical, being longer and narrower as its 

 whole body is longer and slenderer, since 0. atriceps is an unusually 

 short and plump species. The eyes are quite remote ; ocelli arranged 

 in a low, but nearly equilateral triangle; surface finely punctured, 

 but not very minutely so; vertex convex, full and broad, with a slight 

 impressed line in front of the anterior ocellus; in front not deeply 

 channelled ; antennal groove large and broad, lined on each side with 

 a golden pubescence; clypeus two-thirds as long as broad, sharply 

 carinated, clypeal region covered with a golden pubescence which in 

 some lights is silvery. Head in front squarer than usual, sides not 

 converging so rapidly as usual towards the insertion of the jaws. 

 Palpi moderately stout, joints slender, not dilated much; mandibles 

 pale yellow, black at tip, outer side smooth, not furrowed. Antenna} 

 short and thick, dilated sensibly beyond the middle, flagellum 

 thickened towards the tip, joints being short and thick, brown black, 

 scape entirely yellow. 



Prothorax broad, transversely carinated on each side, acutely dentate 

 on the side, on each half two oval lanceolate yellow stripes. Surface of 



PROCEEDINGS EST. SOC. PHILAD. MAY, 1866. 



