178 PROCEEDINGS OF THE NATIONAL MUSEUM vol. m 



Scutellum with small coarse punctures present, but vague. Second 

 elytral stria obsolete, represented basally by four or five fine and very 

 feeble punctures. Fifth and eighth striae obsolete, represented by a 

 vague row of fine pimctures; the five well-developed striae between 

 suture and humeral umbone deep and coarsely punctured, dorsally 

 without hairs. Punctures separated by slightly more than their di- 

 ameter. Epipleuron and elytral margin each bear a row of setae. 

 Fore tibia usually armed with eight or nme teeth on outer margin. 

 Mesosternal prominence in front of middle coxae acute, not elevated 

 above the plane of the metasternum. Hair of underside not dense. 



Head of both sexes similar to that of Bolbocerosoma farctum 

 Fabricius. The transverse carina of female with only a trace of the 

 small lateral tubercle. Pronotal modification of male poorly devel- 

 oped; the carina somewhat emarginate medially, the tubercle at each 

 end very small and vague. Pronotal disk of holotype with a broad, 

 rather feeble, but distmct depression on each side midway between the 

 pronotal modification and humeral umbone of elytron. This depres- 

 sion is lacking in some of the other specimens examined. In the 

 female the carina is evenly arcuate, with lateral carinae obsolete, 

 barely indicated by slight swellings. 



Genital capsule of male short, lateral lobes no longer than wide. 

 The distinctive characteristic of the species is the lateral lobes of the 

 genitalia which are deflexed at their apices to form hooks, (Figured 

 by Brown.) 



Variation was slight in the few specimens examined. The pronotal 

 depressions do not appear too consistent, but the pattern seems fairly 

 constant, with the large black area of the elytron usually separated 

 in the females from the black elytral margin except at the apex. 



B. hamatum was probably the species mentioned in Blatchley (1928, 

 p. 29) as farctum: Collected at "Gainesville, one, July 30, flying over 

 grass of wet prairie; one, Aug. 3, beneath loose bark of pine (Doz.)" 

 (Dozier, 1920). From the data on the few specimens examined, the 

 adults appear to be active for a large part of the year. 



Specimens examined: 5 males, 6 females. 



FLORIDA: 1 male, no date (Robinson). 1 female, no date (MCZ). 1 male, 

 2 females, Gainesville, Apr. 6 and Oct. 5, 1935, Young (UnMich). 1 female, 

 Kissimmee (Cartwright). 1 male, Lakeland, Sept. 11, 1919 (Robinson). 

 1 female, St. Augustine, Liebeck Collection (Fall at MCZ). 1 male, Stein- 

 hatchee River, April (AMNH). 



GEORGIA: 1 male (holotype 1578), Billy's Island, Okefenokee Swamp (CU). 

 1 female, Chickamauga, June 26, 1898, Viereck (USNM). 



