1947] 
Cerceridce 
25 
Wings darkened in front and towards tip; marginal cell 
quite long and narrowed toward tip; pedicel of second 
submarginal fully one-half of cell’s height. 
Length 10 mm. 
o 
From Palmerlee, Arizona, Biedermann coll. Type 
M.C.Z. no. 23540. 
Cerceris ferruginor V. & C. 
Viereck and Cockerell, Jour. N. Y. Ent. Soc., 12: 134, 
1904. 
Described from New Mexico; I have one from Tucson, 
Arizona, July (Bequaert). The unusual length of the 
first segment readily distinguishes it. 
Cerceris populorum V. & C. 
Viereck and Cockerell, Jour. N. Y. Ent. Soc., 12: 135, 
1904. 
Tucson, Arizona (F. H. Snow). 
Cerceris semiatra sp. nov. 
Male. Deep black; from middle of third abdominal 
segment above to tip of abdomen yellow, and a narrow 
yellowish band on these segments below. On face is a 
narrow orbital streak, at top occupying hardly one-half 
of space between eye and antenna, and below running out 
before reaching the mandibles; the yellowish hair-lobes 
are short ; face below antennae with much rather long hair, 
in most views silvery. The antennae (including scape be- 
low) are black. On the pronotum there is a trace of a 
narrow, yellowish line each side; no other pale on head 
nor thorax. Legs black, front and mid tibiae show a pale 
streak on front side, tarsi more brown, but with white 
hair, appear paler. 
Fore wings with usual dark spot at tip ; stigma and the 
veins before it yellow, veins beyond and behind stigma 
brown. 
Face with nearly parallel sides, higher than broad; 
clypeus quite large, rounded above and on sides, below 
truncate, and not as coarsely punctate as rest of face. 
Antennae as long as width of head, broadened toward tip, 
