I 



ART. 5 GENEEIC REVISION- OF THE FOSSORIAL WASPS PARKER 137 



those of nubilip&miis. The female can readily be distinguished from 

 the female of nuhUipennis by the presence of black, more or less 

 extensive, on the clypeus, which on nuhUipennis is entirely yellow. 



Arizona: (C. F. Baker). 



Caufobnia: Bard (August 14, 1920, H. R. Reed) ; Los Angeles Couuty (Coquil- 

 lett) ; San Bernardino County (Coquillett). 



BEMBIX TROGLODYTES Handlirsch 



Bembex troglodytes Handlirsch, Sitz. Akad. Wissensch. Wien, Math.-Nat. CI., 



vol. 102, 1893, p. 829.— Dalla Toree, Cat. Hym., vol. 8, 1897, p. 515. 

 Bembi<p troglodytes Parker. Proc. U. S. Nat. Mus., vol. 52, 1917, p. 108. 



This species and the following one {helianthopolis) are closely 

 related and are not likely to be confused with any other North 

 American species. On both species the antennae of the males are 

 plain, neither spinose nor excavated, the middle femora are smooth 

 below, and the fasciae on the tergites, except that on the first, are 

 continuous, and that on the second incloses, either perfectly or im- 

 perfectly, a pair of black discal spots. Troglodytes is much more 

 slender in build than spvnolae and its related species. The macula - 

 tions are yellow. 



Of the 11 specimens on which Handlirsch based his description 

 of this species, 3 bore the label " Mexico." Apparently the locality 

 from which the other specimens were obtained was unknown. 



SPECIMENS BXAMINBD 



Arizona: (C. F. Baker). 



New Mexico: Las Cruces (August 27, Townsend). 



Texas: Austin; Cypress Mills (Ashmead) ; Huntsville (C. Hartmann). 



BEMBIX HELLANTHOPOLIS Parker 



Bembix helianthopoln Parker, Proc. U. S. Nat. Mus., vol. 52, 1917, p. 113. 



This species is closely related to troglodytes^ as was pointed out 

 above. The male may be distinguished from the male of troglodytes 

 by the lack of discal marks on the scutum, lack of maculations on the 

 dorsum of the propodeum, and by the difference in the form of the 

 genital stipes. The females of the two species are separated on the 

 difference in their maculations: helianthopolis has the labrum (ex- 

 cept sometimes the extreme lateral margins), the scape, and the 

 sixth tergite black; troglodytes has these part yellow or conspicu- 

 ously maculated with yellow. 



SPECIMENS BXAMINBD 



Kansas: Barber County (1916, R. H. Beames). 

 Texas: Victoria (July 15, 1915. J. D. Mitchell). 



