1947] 
Cerceridce 
33 
Length 5 mm. 
One male from Tenrpe, Arizona, 1 August (Bequaert). 
Type M.C.Z. no. 23538. 
Cerceris (Apiratrix) seminigra sp. nov. 
Male. Deep black; first and second segments of ab- 
domen jet black, no pale marks, third to sixth segments 
inclusive entirely yellow above. Venter with yellow spots 
on sides of segments four to sixth ; face with lateral marks 
touching a large spot on clypeus, lateral lobes and face 
above clypeus black; long silvery hairs on face-marks and 
lower face ; antennae rufous, darker toward tip, scape be- 
low pale. Two small spots on pronotum, tegulae, two 
fairly large spots on scutellum, all pale yellowish. Hind 
legs almost wholly black, a small pale streak at base of 
tibia above, front and mid legs wholly black on femora ; 
tibiae black except yellow on upper side ; tarsi pale. Wings 
slightly fumose, darker in front toward tip, stigma brown. 
Face rather wider above than below, clypeus rounded 
above and on sides, almost as long as broad, below con- 
vex; the white hair-lobes very broad, almost meeting in 
middle ; a moderately high carina between antennae ; an- 
terior ocellus hardly larger than others, and about one 
and one-half diameter from them. Antennae short, not 
equal width of head, broader towards tip, third joint 
slender, much longer than the fourth. Hair on head and 
mesonotum plainly shorter than usual; enclosure smooth, 
with distinct mid groove. Abdomen rather short, first 
segment broader than long, fully one-half of hind width 
of second segment, latter not as long as usual, but broader 
in front at attachment, third segment scarcely broader 
than second. Pygidium about one and one-half times 
as long as broad, tip very broad, truncate, nearly as 
broad as the base, slightly broader in middle, surface 
minutely granulate, and with about ten large punctures. 
Much long white hair on underside of last three segments. 
Fore wings have the marginal cell a little narrowed 
toward tip, second submarginal with very short pedicel, 
third a little longer below than broad, outer side bent a 
little near end, not sinuous. 
