186 PROCEEDINGS OF THE NATIONAL MUSEUM vol. m 



Head of liolotype with tubercles of eye canthi and clypeus pro- 

 nounced, sharply upturned; horn in center of vertex long, somewhat 

 conical, tip not bifid. Pronotal modification with the pronounced 

 transverse carina deeply emarginate, lateral limiting grooves deep, 

 lateral carinae large and elongate. 



The female of this species is not known. 



Genital capsule of male blunt, almost identical to pusillum, lateral 

 lobe about 1.3 times as long as wide, tipped with a few long setae. 



Variation in this species appears slight in the two specimens seen. 

 Markings are almost identical, but in one specimen the postmedian 

 spot in the elytron begins at the third stria. The carinae of the head 

 and pronotum are slightly less pronounced than in the type. 



The species can be distinguished from other species — particularly 

 from pusillum to which it is closely allied — by the pronotum heavily 

 punctured, by the rather vague cu'cular elytral spot, separated from 

 the sutural stripe, and by the scutellum with only a black margin, not 

 entirely black as in other species. The presence of long erect hairs on 

 the elytra and pronotum and the shape of the lateral lobes of the geni- 

 tal capsule show extremely close relationship with pusillum. 



Specimens examined : 2 males. 



TEXAS: 2 males. New Braunfels (Comal County), (1) type, August, Schaeffer 

 (Robinson); Comal County (1) (AMNH). 



Bolbocerosoma ritcheri, new species 



Holotype: Male, length 8.5 mm., greatest width 6.1 mm. 



Dorsum yellow-brown to light red-brown, marked with black as 

 follows: Eyes, eye canthi, tubercles, vertex, horn, clypeus except 

 tubercle, apical pronotal margin between lateral carinae, tips of 

 lateral carinae, lateral portions of transverse carina almost to midline, 

 spot on either side of base of pronotum between outer edge of scutellum 

 and elytral margins, scutellum, extreme base of elytra to humeri and 

 completely around elytral margins, sutural intervals, elytral punctures, 

 and postmedian oblong spot extending from third to ninth striae. 

 The elytral spot is quite similar to that of B. confusum. Ventral 

 thoracic sclerites dark brown to black, ventral portions of head and 

 abdomen yellow-brown. Tibia fringed with dark brown, almost no 

 black. Vertex coarsely, moderately, fairly evenly punctured, punc- 

 tures becoming coarser and slightly more numerous on the clypeus. 

 Pronotum coarsely, irregularly punctate medially, lateral portion 

 more finely, closely punctate, more so anteriorly. Minute secondary 

 punctures evenly distributed over pronotum. Lower half of pronotal 

 declivity heavily punctate. Scutellum is unusual in having on it 10 

 or more coarse, irregularly placed punctures with no or few minute 

 secondary punctures. Second elytral striae absent, fifth obsolete, 



