1963] 
Barr — Ptomaphag.us 
5i 
las, F.S.C., R. Oescli, Stewart Peck, Jack Reynolds, M. W. Sander- 
son, and H. R. Steeves, Jr. For assistance in collecting, I am indebted 
to Oscar Hawksley, Leslie Hubricht, Walter B. Jones, H. R. Steeves, 
Jr., and Frederick R. Whitesell. Dr. Rene Jeannel, Museum Nation- 
al d’Histoire Naturelle, Paris, kindly lent me the type of P. laticornis 
for examination. 
Key to known Species of Cavernicole Ptomaphagus 
of the United States (Based on Jeannel 1949) 
1 Elytral apex rounded in the male, obliquely truncate with 
external apical angle present in the female; pronotum with 
feeble or no transverse strigae ( hirtus group) 2 
1' Elytral apex rounded or truncate in the male, acuminate in 
the female, external apical angle effaced ; pronotum usually 
with prominent transverse strigae ( cavernicola group) .... 4 
2(1) Eyes reduced to a very small, pale areola ; pronotal disc 
without transverse strigation or with strigae limited to region 
near the margins 3 
2' Eyes small but pigmented; pronotal disc lightly and irregular- 
ly transversely strigose; Oklahoma, Arkansas 
shapardi Sanderson 
3(2) Antennal segment VI 11 half as long as wide; transverse 
strigae feebly developed near margins of pronotal disc; south- 
ern Illinois nicholasi n. sp. 
3' Antennal segment VIII three-fourths as long as wide; trans- 
verse strigae almost completely absent from pronotal disc; 
west-central Kentucky hirtus Tellkampf 
4(1) Eyes reduced to a very small, pale areola, their diameter less 
than distance from anterior margin of eye to base of antenna; 
no functional wings; Alabama, Tennessee, or Georgia 5 
4' Eyes large and pigmented, their diameter greater than the 
distance from anterior margin of eye to base of antenna; 
functional wings present; Ozark region 
cavernicola Schwarz 
5(4) Antennal segment III not longer than segment II 6 
5' Antennal segment III longer than segment II 10 
6(5) Form oblong, less convex; pronotum narrow, its greatest 
width at the base 8 
6' Form shorter and convex; pronotum broad, its greatest width 
in front of the hind angles; elytra short and convex, briefly 
attenuate in the male; antennal segments IX and X not 
longer than wide 7 
