1949] 
W erner — Epicauta 
105 
die tibisB and the tarsi, which are black. The first tar- 
sal segments often have a few cinereous hairs dorsally at 
the base. 
Male with two spurs on the anterior tibiae and with 
posterior surface of trochanter, femur and tibia of mid- 
dle and hind legs denuded, slightly flattened, with a dor- 
sal fringe of long cinereous hairs. Posterior tibial spurs 
slender, sticklike. 
Holotype: Borrego, San Diego Co., California Oct. 
8, 1947 G. P. Mackenzie (M.C.Z. No. 28220) 
Allotype: ? eutopotypical (M.C.Z.) 
Paratypes: llcft?, 3?? eutopotypical; 2?? topotypical 
Oct. 28, 1939; 1<?, 1? topotypical Oct. 14, 1948. 5c?cf, 6?? 
San Jacinto Mts., Riverside Co., California Oct. 7, 1947. 
lc? Vallecitos, San Diego Co., California Oct. 28, 1939. 
All collected by G. P. Mackenzie. 
Paratypes are deposited in the collections of the U. 
S.N.M., Chicago Nat. Hist. Mus., Calif. Acad., G. P. 
Mackenzie and F. Werner. 
Mr. Mackenzie, who kindly loaned this fine series for 
description, appends the following information on the 
localities: Borrego (sometimes spelled Borego), several 
miles south of the town; San Jacinto Mts., about fifteen 
miles west of Indio on Rt. 74, on the east slope of the 
mountains; Vallecitos, 20 miles south of Borrego. El- 
evation of all three places ca. 2500 ft. Vegetation of 
a desert type. 
In my key the male runs to couplet 37, differing from 
aspera and nigrit arsis by being black with sparse cin- 
ereous pubescence and in having the midventral abdom- 
inal black markings composed of denuded areas with at 
most scattered, very short pubescence, rather than of 
black pubescence which is as dense as on the rest of the 
abdomen in aspera. The female keys to couplet 67, but 
differs from ingrata and longicollis in its small size and 
uniform pubescence. Some females of impressifrons 
also key out here but can be distinguished by head form. 
Epicauta impressifrons Van Dyke 
1929, Bull. Br. Ent. Soc. 24: 12. 
Several samples of Epicauta from near the type lo- 
