CHARLES SCHAEFFER. 253 



vation. In the male of ferrugiueus Beauv. the thorax has in front 

 of the elevated portion on each side a slightly recurved sharp tooth 

 and each side near base a somewhat broad obtuse projection, the 

 clypeus is broadly emarginate, with the angles prominent ; the cly- 

 peus \n fossatus Hald. is strongly bisinuate. 



BOL.BOCKKAS Kiiby. 



This genus is principally distinguished from the allied genera by 

 the contiguous or nearly contiguous intermediate cox?e, and the eyes 

 not entirely divided. 



Bradi/cinetas hornii Rivers and minor Linell have the interme- 

 diate coxae very narrowly separated, nearly contiguous, and must 

 therefore be placed in Bolboceras. 



For Bolboceras farctmn Fab. I was compelled to erect a new 

 genus on account of the entirely divided eyes and the intermediate 

 intercoxal process having between the coxse a tooth -like elevation. 



The three species known to occur within our faunal limits may 

 be known by the following table : 



TABLE OF THE SPECIES OF BOLBOCERAS. 



1. Hind tihi£e with one transverse ridge on the upper edge, slightly below mid- 



dle lazaruiii Oliv. 



Hind tibiae with two distinct transverse ridges on the upper edge, one smaller, 

 about middle, the other larger, about apical fourth 2. 



2. Large species, about 14 mm. long, anterior angles of thorax obtusely rounded, 



metasteruum densely covered with long hairs horuii Riv. 



Small species, about 9 mm. long, anterior angles of thorax acute, metasternum 

 sparsely clothed with moderate long hairs minor Linell. 



Of our three species lazarus Oliv. is very common widely distrib- 

 uted and well known ; minor Linell, which occurs in S. Texas is 

 very similar to the Californian hornii Rivers, from which it differs, 

 besides the charactei's given in the table, by the more elongate scu- 

 tellum, coarser elytral striae, slightly longer anteunal joints and club, 

 the short, conical frontal horn of the male and having the interme- 

 diate coxae not quite as narrowly separated. Both species — hornii 

 Riv. and minor Linell — resemble farctus Fab. very much in form 

 as well as in the armature of the head and thorax of the males. 



The description and figure of the Mexican Bolboceras arcuatus 

 Bates* agrees in nearly every respect with Bradycinetus minor 



* Biol. Cent. Am., vol. ii, pt. 2, p. 111. 



TKANS. AM. BNT. SOC. XXXII. AUGUST, 1906. 



