no. 2173. A REVISION OF THE BEMBICINE WASPS— PARKER. 71 



5-11 of the flagellum bear on their lower surfaces specialized areas 

 scarcely at all prominent and difficult to distinguish. The large size, 

 conspicuous fasciae of the abdomen together with the thoracic mark- 

 ings, and the medial dark spot on the anterior pair of wings distin- 

 guish this species at once from all other members of the genus herein 

 described. 



Habitat. — Texas, New Mexico, Arizona, and probably Mexico. 



Number of specimens examined — Males, 7; females, 8. 



BICYRTES INSIDIATRIX Handlirsch. 



Figs. 126, 127. 



IMonedula ventralis Cresson (part), Trans. Amer. Ent. Soc, vol. 4, 1872, p. 220. 

 Bembidula insidiatrix Handlirsch, Sitz. Akad. Wissensch. Wien, Math.- Nat. 

 CI., vol. 98, 1889, p. 494, female, male. 



Male. — Black: Clypeus except apical border, broad anterior orbits, 

 narrow posterior orbits, posterior border of pronotum including tuber- 

 cles, lateral stripes on scutum not reaching anterior border, usually a 

 pair of discal lines or spots on same, pair of lateral spots on scutellum 

 more or less approximated at median line, transverse fascia on meta- 

 notum, lateral angles of median segment, fasciae on tergites 1-6 nar- 

 rowly interrupted medially, sometimes first or first and second con- 

 tinuous, lateral spots on sternites 2-3, yellow. Labrum, mandibles 

 except tips, scape, first and second joints of flagellum, remainder of 

 flagellum more or less, legs except coxae, ferruginous. Wings in- 

 fumated about the same as the wings of ventralis. - Intermediate 

 femora carina te but not dentate. • 



Female. — Black: Clypeus except apical border, broad anterior and 

 narrow posterior orbits, lateral fines on scutum not reaching the an- 

 terior border, usually a pair of discal spots or lines on same, pair of 

 large lateral spots on scutellum, curved fascia on dorsum of median 

 segment (sometimes absent), lateral angles of same, fasciae on tergites 

 1-5 narrowly interrupted medially, first or first and second continuous, 

 lateral spots on sternites 2-4, yellow. Scape, first and second joints 

 of flagellum, remainder of flagellum more or less, labrum, mandibles 

 except tips and usually a spot on base, tegulae, apex of ultimate 

 abdominal segment above and below, legs except coxae, ferruginous. 

 Wings somewhat more heavily infumated than those of the male; 

 ultimate tergite without a pygidial area or lateral lines; ultimate 

 sternite faintly carinate. 



Length. — 12-14 mm. 



The labrum and mandibles, especially among the males, may be 

 black; the ferruginous markings elsewhere, especially on the legs, 

 may vary from almost yellow to nearly black. The dark area on the 

 clypeus always arises from the apical border, never from the base. 

 The scape below may be more or less yellowish; the flagellum of the 



