196 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lo* 



of this, carinatus Schaeffer should not have been synonymized, and, 

 as the AustraHan species carinatus Blackburn certainly cannot be 

 referred to the present genus Bolborhombus established by Cartwright, 

 the name carinatus Schaeffer is restored here. 



The species Bolborhombus carinatus (Schaeffer) has been sparingly 

 found in Arizona, New Mexico, Texas, and Mexico from June through 

 October with one record in December. The majority of specimens 

 were collected during July and August, some of these bearing the 

 label "light." 



Bolborhombus angulus (Robinson) 



Bolboceras angulus Robinson, 1947, p. 170, Type, male, Dog Canyon, Brewster 



County, Tex. (Robinson). 

 Bolborhombus avgulus (Robinson) Cartwright, 1953, p. 117. 



Originally described from a unique specimen, three others have 

 since been found. Three of the specimens, including the type, were 

 collected in Brewster County, Tex., while the fourth specimen came 

 from Miller Canyon, Huachuca Mountains, Ariz. All of them were 

 collected in July. 



Bolborhombus parvulus Cartwright 



Bolborhombus parvulus Cartwright, 1953, p. 118. Type, male, Triunfo, Baja 

 California, Mexico, Aug. 7, 1938, Michelbacher and Ross (CAS). 



This species was described from four specimens, all from Baja 

 California. They were collected at Triunfo, San Venancio, and 

 Santa Rosa in August and October. 



Genus Bolbocerastes Cartwright 



Bolbocerastes Cartwright, 1953, p. 105. 



Genotype: Bolbocerastes regalis Cartwright, designated by Cart- 

 wright (1953, p. 105). 



Generic limitations: Given by Cartwright (1953, p. 105): 



This genus is closely allied to Bradycinetulus but diflfers in that the apex of the 

 tibia of the middle and hind legs is obliquely truncate, the scutellum is smooth 

 or minutely punctate, the mandibles are parallel, nearly straight sided and bent 

 sharply inward anteriorly, the sides and anterior edges forming a rectangle, the 

 median prominence of the pronotum is without horns, two elevated carinae are 

 present on each side of the pronotum, the prosternal spine behind the anterior 

 coxae is transverse, doubl}' pointed and remote from the acutely angled inter- 

 coxal piece, and the aedeagus of the male is of a characteristic form . . . 



Descriptions, keys, references, and distributions of the species are 

 given by Cartwright. 



All of the known North American species are quite similar in form. 

 They have frequently been recorded coming to light, while an occa- 



