CENTRINITES. 321 
and one, C. dentimanus, has the anterior tibie armed with a triangular median tooth 
in this sex. The species may be grouped thus :— 
a, Prosternum bispincse in the ¢. 
a', Intermediate and posterior tibi thickened and armed with a sharp tooth 
beneathinthe @ . 2. 1. 1 ee ee ee ee te ew ee + Species 1-3, 
b'. Intermediate and posterior tibiz without tooth beneath in either sex. . . Species 4. 
6. Prosternum unarmed in the 2. 
a’. Anterior tibie armed with a triangular tooth inthe ¢ . . . . + . « Species 5. 
i}. Anterior tibiz without triangular tooth in either sex* . . . . . . + Species 6,7. 
1. Centrinites audax, sp.n. (Tab. XVII. figg. 1, la, b, 3.) 
Elliptic, piceous, the antenne (the club excepted) ferruginous ; above sparsely clothed with rather coarse, 
intermixed brown and white, decumbent, setiform scales, the vestiture of the under surface coarser, 
closer, and wholly white. Head closely punctate, foveate between the eyes; rostrum arcuate, stout, 
about as long as the head and prothorax, coarsely striate-punctate and tricarinate, smoother at the tip 
in the 9, the antenne inserted at a little beyond the middle, the antennal club ovate. Prothorax 
broader than long, with the sides gradually and arcuately converging from near the base, constricted in 
front ; rather coarsely, confluently punctate, the narrow interspaces raised into sinuous longitudinal 
ridges, the disc subcarinate. Elytra somewhat triangular; deeply punctate-striate, the interstices 
coarsely, rugosely punctate. Beneath densely punctate. Prosternum slightly depressed down the 
middle. Legs rather stout, rugosely punctate. Anterior cox narrowly separated. 
$. Prosternum armed with two short, upwardly curved spines, and with a deep excavation between them ; 
first ventral segment depressed down the middle; intermediate (fig. 16) and posterior tibise somewhat 
dilated and each armed with a sharp tooth on the lower face beyond the middle. 
Length 4-42, breadth 2-2; millim. (d 2). 
Hab. Mexico, Pinos Altos in Chihuahua (Buchan-Hepburn), Ventanas in Durango 
(Hage). 
A pair from Chihuahua and a female from Durango. Larger and more elongate 
than Gereus pugnax (Boh.), the vestiture not so fine and denser beneath, the punctures 
on the prothorax here and there confluent and separated by raised sinuous lines, the 
mandibles decussate, the legs stouter, the intermediate and posterior tibie dentate 
beneath and distinctly widened. C. latierus and C. T-flavwm are nearly related forms. 
C. audax resembles the N.-American C. strigicollis, but it is larger and has peculiar 
male-characters. 
9. Gentrinites T-flavum, sp.n. (Tab. XVII. figg. 2, 2a, 6, 3.) | 
Subrhomboidal, opaque, nigro-piceous, the antenne, prosternal spines, and tarsi, and sometimes the tibie 
also, ferruginous; a common, interrupted, T-shaped mark at the apex of the elytra, the ante-coxal 
portion of the prosternum, and a spot on the mesothoracic epimera, thickly clothed with narrow ochreous 
scales, the rest of the elytral vestiture sparse and fuscous, with a few pallid scales intermixed, that of 
the prothorax ochreous and clustered into three faint vitte, the rest of the under surface sparsely 
squamose. Head closely punctate, transversely grooved between the eyes; restrum strongly arcuate, 
* (, strigicollis, Casey, belongs to this section. 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 5, September 1908. OTT 
