14 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 52. 



fasciae on tergites 2-5, that on segment two on either side of midline 

 prolonged forward in the form of an inwardly pointed tooth, those on 

 third and fourth less prolonged, ultimate tergite with bilobed spot at 

 apex, lateral spots on sternites 2-6, white, sometimes tinged with 

 greenish yellow. 



The distal joint of the flagellum is reddish at the apex and the seg- 

 ments beyond the second are more or less so below. The middle 

 tibiae are dilated; the first segment of the middle tarsus is only 

 slightly curved basally and lacks the carina found on the male. The 

 pubescence is similar to that of the male but somewhat less well 

 developed. 



Length. — 14-16 mm. 



The color of the markings of this species varies from yellow through 

 yellowish or greenish white to almost white. All the flagellar seg- 

 ments may be lighter beneath than above, but the light color is more 

 pronounced on the proximal ones and always more in evidende on the 

 female than on the male. The lateral spots on sternites 2-5 may or 

 may not be connected by apical lines on the female ; they are not so 

 connected on the male. The spots on the sixth sternite of the female 

 are sometimes united. On some specimens there is an irregular spot 

 on the side of the median segment posteriorly, extending slightly onto 

 its posterior surface. The line on the posterior border of the pro- 

 notum of the male may be wanting or present as two widely separated 

 spots, and the fasciae on tergites 2-4 may be interrupted medially. 



In this species the eyes are not so widely separated as in dwplicata, 

 and in both males and females they are distinctly divergent at the 

 clypeus. 



Habitat. — Colorado, Utah, Wyoming, British Columbia. 



Number of specimens examined — males 8, females 14. 



STENIOLIA TIBIALIS Handlirsch. 



Figs. 11, 16, 29, 30, 32, 33. 



Steniolia tibialis Handlirsch, Sitz. Akad. Wissensch. Wien, vol. 98, 1889, p. 

 513, pi. 2, fig. 1, male and female. 



Male. — Black: Labrum, mandibles except tips, clypeus, scape 

 below, first two flagellar segments below, small spot between antennae, 

 anterior orbits, narrow posterior orbits, broken line on posterior 

 border of pronotum, tubercles and narrow line on sides of prothorax, 

 spot on tcgulae, lateral spots on scutellum, sometimes short fascia on 

 metanotum, pair of large lateral spots and pair of small medium pos- 

 terior dorsal spots on first tergite, continuous fasciae on tergites 2-6, 

 that on second with a deep anterior medial emargination which is 

 produced to right and left posteriorly, remaining fasciae with shallow 

 anterior median biemarginations, seventh tergite apically, lateral 

 spots on sternites 2-6, femora distally more or less, tibiae except line 

 on first pair below, and tarsi, yellow. 



