1938 ] 
The Genus Lithurgus 
149 
Wyoming: 1 $, Lake Bamforth, June 24, 1934 (R. 0. & 
V. D. Christenson). Recorded also from Green River 
(July), Laramie River and Sheridan (Aug., on Carduus ) . 
Specimens of apicalis have also been recorded from 
Kansas — Hamilton County; Nebraska — War Bonnet Can- 
yon (June) ; and South Dakota — Custer. 
Lithurgus apicalis var. opuntiae Cockerell 
Lithurgus apicalis opuntise Cockerell, Ent. News 13, p. 182, 
1902. Cockerell, Proc. U.S.N.M. 40, p. 251, 1911. 
Cockerell, Ann. Mag. Nat. Hist. (8) 13, p. 433, 1914. 
There is no evident structural difference between this 
form and typical apicalis, the chief difference being one of 
color. It bears a close resemblance to L. bruesi, the females 
especially of the two being very similar. The presence of a 
single median emargination on the apical margin of the 
clypeus seems to be a constant character which will dis- 
tinguish it from the female of bruesi in which there are 
three emarginations. The simple labrum of the male will 
easily distinguish it from bruesi in which that part is 
bispinose basally. 
Arizona : 1 9 , no locality record. 1 s , Kits Peak, Rincon, 
Baboquivari Mts., Aug. 1-4, 1916. 1 $ , 1 9 , S. Rita Mts., 
5-7 and 12-6. Recorded also from Fort Grant. 
California: 1 $, Andrews Canyon, Apr. 5, 1925, (Tim- 
berlake, on Opuntia) [Timberlake] . 
Colorado: 2 $ , White Rocks, Valmont, May 30, 1934. 
Mexico: 1 s , 1 9 , N. Sonora (Morrison) [Brit. Mus.]. 
Texas : Recorded from Valentine. 
Lithurgus apicalis var. littoralis W. P. Cockerell 
Lithurgus apicalis littoralis W. P. Cockerell, Journ. N. Y. 
Ent. Soc. 25, p. 191, 1917. 
I have had no opportunity to examine this form. It was 
briefly described from material collected at Point Isabel, 
near Brownsville, Texas. The size (10 mm.) and the pres- 
ence of distinct black hair on the discs of the abdominal 
terga suggest that it is distinct from apicalis. I have one 
small male of bruesi which fits the description of littoralis 
