146 AVILLIAM J. FOX. 



of males with the fourth joint strongly emarginate beneath ; fore 

 tarsi (^ % ) distinctly flattened, and first joint of medial tarsi at the 

 most strongly produced at apex within. 



14. Crabro !«o.iLniaculatus Say. 



Crahro 6-mucidatHS Say, Keating's Narr. Exp. St. Peter's River, ii, Appeuclix, 



p. .341, 9 . 

 Crabro sexinactdnfus Packard, 1. c, ]>. 91, 9 "h ■ 



9 . — Head with distiuct punctures, closest auteriorly, tolerably well separated 

 beliiud the ocelli ; space between the hind ocelli about equal to that between them 

 and the nearest eye-margin ; lateral tooth of pronotum small, indistinct ; dorsulum 

 rather coarsely and closely punctured, the punctures on posterior portion but little 

 or not at all sparser than those on anterior; punctures of scutellum sparser; 

 niesopleurai coarsely striato-punctate : middle segment above and posteriorly with 

 tolerably fine striie, sides delicately striated, no trace of fovea?, between the upper 

 and posterior faces, the latter not at all ridged at the sides. Black ; spot on man- 

 dibles, scape entirely or in part, two variable spots on pronotum, tubercles, line 

 on metanotuin, scutellum in part sometimes, tips of femora in some cases, tibiae 

 except a spot within, first joint of tarsi, an elongated spot on each side of dorsal 

 segments 2, 4 and 5, the third segment sometimes spotted and in some specimens the 

 spots on segment 5 are united, yellow or pale yellow ; size of spots on third seg- 

 ment, when present, variable ; head, thorax and first segment of abdomen with 

 toler.ably long and conspicuous pubescence: wings subhyaline, somewhat darker 

 apically. Length 9-12 mm. 



% . — More coarsely sculptured than in the 9 ; first joint of flagellum distinctly 

 longer than the second ; middle segment with the upper surface and posterior 

 face separated by distiuct fovese, posterior face transversely rugose, the lateral 

 ridges indistinct, but bounded outwardly by a foveolated furrow ; first and second 

 joints of medial tarsi strongly produced at apex within, almost spinose; colored 

 and marked like the 9 » with the following additions : fore femora and tibite 

 reddish anteriorly, otherwise yellow and black ; first abdominal segment some- 

 times .spotted and with the spots on the other segments are in some cases united. 

 Length 8-10 mm. 



Occurs from Canada to Delaware (Packard), westward to Cali- 

 fornia and Washington, and is, perhaps, our commonest species. 

 Say mentions a yellow spot as occurring on the pleurae beneath the 

 wings ; this is not present in any of the 59 9 specimens before me ; 

 a large series of the h also fails to disclose it. It may be that this 

 is not Say's species, but his description is too insuflicient to reach a 

 decision. 



15. Crahro trifascisiAus Say. 



Crabro trifuscuUns Say, Keating's Narr. Exp. St. Peter's River, ii. Appendix, 

 p. 342. 



Crabro frifascintus Packard, 1. c, p. 9.3, % 9 • 

 9 . —Very close to sexmacidatus, though somewhat smaller ; punctures of dor- 

 sulum tolerably well separated on posterior portion ; upper surface of middle 

 segment separated from the posterior face by a rather distiuct series of fovese. 



