NORTH AMERICAN GEOTRUPINAE — ^HOWDEN 187 



represented by 3 to 12 very small punctures, eighth stria represented 

 by a line of 8 to 15 small punctures. A number of punctures on pro- 

 thorax, scutellum, and elytra bear small erect yellow setae similar to, 

 but about one-third as long as those of B. pusillum. The setae are 

 irregularly placed and easily overlooked. They are slightly longer 

 and more dense on elytral margin and epipleuron. The elytral punc- 

 tures are sharp, well defined, and rather irregularly spaced, being 

 separated by slightly more than their diameter in many places, but 

 in some cases, in the same stria, they may be almost confluent. Fore- 

 tibia armed with eight teeth on outer margin. Mesosternal promi- 

 nence in front of middle coxae small, rounded at tip, only slightly 

 elevated above metasternal plane. Hair of underside moderately 

 long and sparse. 



Head with tubercles moderate, those of eye canthi sharply upturned. 

 Horn of vertex rather short when viewed from posterior, broadly 

 conical, tip rather pointed, not bifid. Pronotal modification of male 

 with rather narrow, feebly emarginate transverse carina; lateral 

 carinae, and limiting grooves moderate. 



Genital capsule of male with lateral lobes blunt, very similar to 

 B. pusillum, 1.3 times as long as wide and tipped with 10 long setae 

 (pi. 3, fig. 2). 



Allotype: Female, length 9.5 mm., greatest width 6.8 mm. 



Marked as the holotj^pe except that the transverse carina of the 

 pronotum is black for its entire length, while the black is lacking on 

 the other portions of the pronotal modification. Also, the elytral 

 spot extends almost to the second stria, making the spot somewhat 

 wider than in the male. Vertex, clypeus, and pronotum heavily 

 punctured. The pronotal declivity is heavily punctured over its 

 entire surface. 



Head without tubercles or horn, but with a pronounced transverse 

 carina similar to that of females of B. farctum. Pronotal modifica- 

 tion with a small, evenly arcuate transverse carina, obsolete lateral 

 carinae and limiting grooves. 



Holotype, male, Brownsville, Tex., Sept. 8, 1947, Alexander 

 (USNM 61681). Allotype, female, Brownsville, Tex., July 23, 

 Barber (USNM 61681). Paratype, male, Brownsville, Tex., Sept. 

 8, 1947, Alexander (Howden). 



The tliree specimens examined vary in length from 7.7 to 9.5 mm., 

 and in width from 5.5 to 6.8 mm. Also, variation is evident in the 

 divided spots on the posterior pronotal margin. In the type the 

 spots are well separated, but in the other male the spots are joined at 

 midline at their forward margin, leaving a small brown spot at the 

 pronotal margin. The elytral spots are quite constant, slightly larger 

 in the female than in the males. 



