1949] 
Werner — Epicauta 
95 
third and following segments are just perceptibly flat- 
tened, especially in the male. 
Pronotum as broad as long, subquadrate, with the sides 
parallel for the basal three-fourths, then converging at a 
forty-five degree angle, with the anterior angles rounded. 
Surface like that of head. Midline distinctly impressed 
and narrowly denuded. Basal impressed line distinct but 
not denuded. Elytra with a narrow denuded zone across 
the base, where normally covered by the base of the prono- 
tum. Tips of femora and tibiae and all of tarsi, except for 
a few hairs at the base of the basal segments, with dark 
brown pubescence. Anterior tibiae of male with a single 
stout, slightly incurved spur. Posterior tibial spurs 
slightly broadened and flattened, the outer broader and 
longer. 
Holotype : <?, Tucson, Arizona VII-30 (Fall Coll. M.C.Z. 
No. 28221) 
Allotype: 2, topotypical, VIII-1 (Fall Coll.) 
Paratypes: Tucson. Arizona: 12 VII-21 (Fall Coll.), 
12 VII-21 (Liebeck Coll.), 6c?<?, 622 Aug. 1935 Bryant 
(Parker). Sabino Canyon, Santa Catalina Mts., Ari- 
zona: 12 7-14-32 E. D. Ball (Parker), 1<?, 12 7-12-32 R. 
H. Beamer (U. Kansas), 1<? VII-26-1948 F. Werner & W. 
Nutting, at light (Werner). 
Tenebrosa runs to couplet 63 in my key. It can be dis- 
tinguished from pedalis by the characters mentioned 
above and from balli by the normal mandibles and the 
presence of a single spur on the anterior tibiae in the male. 
Epicauta bispinosa sp. n. 
This is the third species to be discovered in the United 
States belonging to a very closely-knit group, composed 
of E. maculata (Say), normalis Werner and bispinosa sp. 
n. These all have the same color, form and markings and 
the females cannot be distinguished except by association 
with males. All have numerous denuded spots over the 
whole body and elytra and have the elytra covering the 
abdomen almost completely and not conspicuously bulg- 
ing. The male of maculata has the last segment of the 
labial palpi expanded and suborbicular in outline and the 
