1865.] 



485 



a dot on each side of postscutellum. whitish; pleura covered with fine 

 longitudinal strife; metathorax with a deep central channel, and coarse 

 longitudinal or slightly oblique stria? at base; tegulae piceous or piceous- 

 black. Wings uniformly tinged with pale fuliginous, more or less iri- 

 descent or subviolaceous ; nervures black. Legs black ; the four ante- 

 rior tibiae with a yellow exterior line, and the posterior pair with a 

 broad yellow annulus near the base; tarsi brown. Abdomen subsessile, 

 ovate, subconvex, smooth and shining; first segment with a whitish dot 

 on each side about the middle, sometimes wanting; the second and 

 three following segments each with a transverse, subovate, slightly 

 oblique, whitish spot on each side near the base, those on the second 

 segment longest, those on the fifth segment more approximated; apical 

 segment pubescent, pinched in at the sides, and subacute at tip; venter 

 immaculate, smooth and shining. Length 4 — 5 lines ; expanse of wings 

 6 — 7 •>■ lines. 



Four specimens. 



1 5, Crabro 6-maculatus. Say. 



Crabro 6-maculatus, Say, Long's Second Expedition, ii, p. 341. 

 Ten 9 specimens. The third segment of the abdomen has sometimes 

 a whitish transverse line on each side, and the spots on fifth segment 

 are often confluent and form a regular band. The lines on the post- 

 scutellum are sometimes wanting, while the scutellum is always im- 

 maculate in the specimens from Colorado Territory ; the markings are 

 all whitish, sometimes only slightly tinged with yellowish ; all the femora 

 are black, and not tipped with yellow, and the scape of the antennas is 

 black at base within, None of the specimens before me are over 5} 

 lines in length, and may possibly belong to a distinct species. 



16. Crabro honestus, n. sp. 



Black : line on mandibles, scape, tubercles, legs in part, spot on each side of 

 second abdominal segment, and fascize on the four following segments, inter- 

 rupted ou the third, bright yellow: wings subhyaline. 



Female. — Deep black, subopaque, densely and very finely punctured, 

 slightly pubescent; sides of the face, clypeus and cheeks, silvery; stripe 

 on the mandibles, and the scape of the antennae, except a line at base 

 within, yellow; the joints of the flagellum beneath are uneven and the 

 sixth joint is toothed. Thorax : prothorax with a deep transverse 

 »roove on each side above, and sometimes two obsolete pale spots ; tu- 

 bercles yellow; pleura and sides of metathorax longitudinally and finely 

 striated ; base of metathorax obliquely, and the posterior face trans- 

 versely striated, the latter with a deep central excavation; postscutellum 

 sometimes with an obsolete pale spot on each side ; tegulae testaceous. 



