1936] The Persius Group of Thanaos 109 
sent in afranius) . The hair on the fore wing is all dark or 
with two or three scattered white hairs in eastern speci- 
mens, and seems less dense as a whole; in Arizona it be- 
comes more visible, but seems less than on persius from 
the same neighborhoods. In afranius, where there is more 
hair, the white scaling is also increased in even greater 
proportion. 
Thanaos afranius Lintner 
1878. Nisoniades afranius Lintner, 30th Rept. N. Y. Mus. 
Nat. Hist. 175. 
1898. Thanaos afranius Holland, Butt. Book, pi. xlv fig. 5. 
1921. Thanaos persius, race afranius Lindsey, Univ. Ia. 
Stud, ix (4), 52 (in part). 
1927. Erynnis afranius Lindsey, Denison Univ. Bull. 
Jour. Sci. Lab. xxii, 109 (larva on lupine and discus- 
sion) . 
1927. Erynnis persius afranius Comstock, Butt. Calif. 212 
(in part) , pi. lix, fig. 3 ( ?, not fig. 2) . 
1931. Erynnis afranius Lindsey, Bell and Williams, Deni- 
son Univ. Bull., Jour. Sci. Lab. xxvi. 62 (in part) . 
This species is intermediate between the preceding and 
following, but may usually be distinguished from both by 
its pale gray outer part of the fore wing, with contrasting 
black markings (as seen by naked eye). In California there 
is a form with identical structure, however, that is mostly 
blackish, and should be looked into biologically. 
Male genitalia intermediate between persius and the other 
two species, and more variable than either (suggesting 
possible origin by hybridization). Hair of upper left lobe 
usually in two distinct rows, both long, and converging to 
the upper notch, the upper row very dense in the area cor- 
responding to the smaller hair patch of persius ; sometimes 
the two rows confused by the presence of considerable hair 
in the intervening area ; right valve more distinctive, simi- 
lar to lucilius, but with the chitinous teeth weak, both on 
the edge of upper and tip of lower lobes, occasionally not 
visible on one or both; tip of upper lobe intermediate, al- 
most invariably turning under in a mounted slide as in 
persius, but relatively small. Genitalia as a whole much 
