152 
Psyche 
[December 
Entomologist 33, p. 244, 1900. Cockerell, Ann. Mag. 
Nat. Hist. (8) 13, p. 433, 1914. 
Lithurgus compressus Smith, Cat. Hym. Brit. Mus. 1, p. 147, 
1853. 
Lithurgopsis gibbosus Fox, Ent. News 13, p. 140, 1902. 
This species is the single representative of the genus 
occurring east of the Mississippi River. 
Florida : 1 $ , Capron, Apr. 18. 2 s , Enterprise, Apr. 18, 
1902 (Dr. Castle) and Apr. 24, 1903. 2 S , 1 9 , Flamingo, 
Apr. 13, 1923. 
Georgia: 1$, St. Simons, June 2, 1922 (Mitchell, on 
Opuntia ) . 
North Carolina: 2$, Carolina Beach, June 12, 1930. 
1 $, Raleigh, June 7, 1922 (on Opuntia). 1$, Tarheel, 
July 22, 1928 (on Helianthus) . 4$, White Lake, May 20, 
1934 (on Opuntia) ; (all Mitchell). 
Texas : 2 s , no locality record, 12 s , 20 $ , Bexar County 
(San Antonio) , May 12 to June 1, 1930 (H. B. Parks) . 1 S , 
Fedor, May 1, 1897. Recorded also from Austin and Lee 
County. 
Lithurgus socorroensis new species 
Female. — Size: Length 11 mm.; breadth of abdomen 
3.7 mm. ; anterior wing 7.5 mm. 
Structure: Facial quadrangle slightly narrower above 
than long; eyes convergent below; clypeal margin straight 
and entire; labrum with a basal transverse process which 
is abruptly emarginate medially ; facial protuberance low, 
concave, highly polished, somewhat conical on each side; 
lateral ocelli subequally distant from eyes and edge of ver- 
tex ; vertex rounded ; cheeks subequal in width to eyes ; basal 
joint of flagellum equal to pedicel, the second joint broader 
but slightly shorter; mandibles 3-dentate, the middle tooth 
prominent ; all the metatarsi slender, the hind pair equalling 
their tibiae in length, the others shorter than their respective 
tibiae; pulvilli inevident; outer posterior faces of all the 
tibiae conspicuously tuberculate, the tubercles short and 
acute, those on the front tibia more robust apically, forming 
a quite distinct posterior comb apically, those on the middle 
