GERAUS. 265 
¢. Prosternum armed with two short, widely-separated, slender, porrect spines; first ventral segment 
flattened down the middle ; posterior tibie angularly dilated externally at about one-third from the apex 
and more or less widened thence to the tip. 
Length 34-44, breadth 2-24 millim. (¢ 2.) 
Hab. Mexico, Toxpam, Cordova (Sallé); Guaremana, Zapote, Cerro Zunil 
(Champion); Nicaracua, Chontales (Belt, Janson); Costa Rica, Escazu (Pittier) ; 
Panama, Bugaba, Volcan de Chiriqui (Champion). 
Numerous examples. Easily distinguished by the angularly dilated hind tibie of 
the male. Less elongate than (7. senilis, the second spot on the elytra placed closer to 
the margin and nearer the apex, the prosternal spines short, slender, and porrect. The 
mandibles are slightly hollowed at the sides beneath. Centrinus podagricus, Boh., 
from Brazil, seems to have somewhat similar posterior tibie. 
7. Gereeus senilis. (Tab. XIV. figg. 25, 25a, ¢.) 
Centrinus senilis, Gyll. in Schénh. Gen. Cure. iii. p. 759°; Boh. in Schéuh. Gen. Cure. viii. 1, 
p. 215*; Casey, Ann. N. York Acad. Sci. vi. pp. 576, 589(¢)’. 
Gereus senilis, Pasc. Ann. & Mag. Nat. Hist. (6) iv. p. 323+. 
Centrinus quadrisignatus, Dugés, in litt.’ 
Var. The black spots longitudinally confluent on each elytron. 
Hab. NortH America, Santa Rita Mts. in Arizona *—Mexico!?4 (Truqui, in Mus. 
Brit. ; Dugés, in U.S. Nat. Mus.), Guanajuato, Toxpam, Capulalpam, Etla, Parada 
(Sallé), Chilpancingo (Hoge, H. H. Smith), Matamoros Izucar, Irapuato, Jalapa (Hége), 
Amula, Xucumanatlan (H. H. Smith), Temax in N. Yucatan (Gaumer); GuaTEMALa, 
Aceytuno (Salvin), Panzos, San Juan and San Gerénimo in Vera Paz (Champion) ; 
Costa Rica (coll. Fry), Escazu (Biolley), Piedras Negras (U.S. Nat. Mus.). 
A common insect in Mexico and sent us in great abundance by Mr. Gaumer. It is 
found on a species of Croton, according to Prof. Biolley. G. senilis is a little more 
elongate than any of its allies and the two black spots on the disc of each elytron 
(which are sometimes small or evanescent, and sometimes longitudinally coalescent) 
are placed one, transverse, before the middle, and the other, triangular, towards the 
apex. The fully-developed male has the prosternum sulcate behind the deep, trans- 
verse, polished, subapical excavation, and the spines about as long as the tarsi and 
curved upwards ; the ventral depression in this sex is broad and-shallow. In two of 
the Guatemalan examples the vestiture of the elytra is almost wholly black, except at 
the base and along the suture. ‘The mandibles, as noted by Casey, are hollowed at the 
sides beneath, appearing toothed at the base, when viewed in profile. 
The length varies from 33-6 millim. 
8. Gerzeus rectispinis, sp.n. (Tab. XIV. figg. 26, 26a, ¢.) 
Subrhomboidal, black or piceous, the antennz and prosternal spines, and sometimes the rostrum and the legs 
in part, ferruginous ; thickly clothed above and beneath with rather coarse, narrow, ochreous or flavo- 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 5, May 1908. 23MM 
