APTOPUS. 419 



1. AptopuS pHlinOSUS. (Tab. XIX. figg. 1, <? ; la, genitalia.) 

 Car diophorus pruinosus, Erichs. in Germar's Zeitschr. fiir Ent. ii. p. 329 (1840) \ 

 Aptopus pruinosus, Cand. Monogr. Elat. iii. p. 232 \ 



Hab. Mexico \ Tacambaro in Michoacan, Jalapa and Playa Vicente in Vera Cruz, 

 Oaxaca (Edge), Oriziba (coll. Janson), Tuxtla in Vera Cruz 2 , Etla, Juquila, and 

 Panistlahuaca in Oaxaca (Salle), Tepetlapa in Guerrero (H. H. Smith), Temax in 

 North Yucatan (Gaumer) ; Guatemala, Zapote and San Geronimo (Champion). 



Collected in plenty at Jalapa by Herr Hoge and at Zapote by myself. This is the 

 largest and most robust species of the genus. The antennae in the male are nearly 

 half the length of the body (less elongate in some specimens), shorter in the female. 

 The thorax is transverse in both sexes, and rather closely punctured, with coarser 

 punctures intermixed. The elytral interstices are moderately convex and somewhat 

 thickly punctured. Fresh specimens are thickly clothed with rather coarse silvery or 

 yellowish-cinereous pubescence, which is easily abraded. Some of the specimens from 

 San Geronimo, Juquila, and Panistlahuaca are doubtfully referred to this species, but 

 I am unable to separate them. A typical male from Tepetlapa is figured. 



2. Aptopus collaris, (Tab. XIX. fig. 5, 6 .) 



Elongate, robust, shining, somewhat sparsely clothed with long yellowish-cinereous pubescence : piceous, 

 brown, or reddish-brown, the prothorax, except at the base and apex, rufous or obscure rufous, the 

 antenna? ferruginous, the legs ferrugineo-testaceous. Head densely, finely punctate, dull ; the frontal 

 carina sharply raised and obliquely declivous on either side, truncate in the middle ; antenna? slender, 

 fully one-half the length of the body in the male, shorter in the female. Prothorax broader than long, 

 considerably wider at the base than at the apex; the sides rounded and converging from the middle 

 forwards, rather strongly sinuate behind in the male, feebly so in the female ; the hind angles moderately 

 produced ; the surface closely, finely punctate, the punctures becoming more scattered and more unequal 

 in size on the middle of the disc, and usually more or less distinctly canaliculate behind ; the base with a 

 rather long deep sulcus on either side. Elytra about three and one-fourth times the length of the 

 prothorax, and much wider than it, the sides a little rounded and gradually converging from about the 

 basal third to the apex in the male, more parallel in the female, the humeri rounded ; punctate-striate, 

 ' the interstices moderately convex, flat on the disc in some specimens, and somewhat thickly punctured. 

 Beneath closely, finely punctate, the metasternum with distinct intermixed coarser punctures. 



Length 10|-13, breadth 3-3£ millim. 



Hab. Guatemala, near the city (Salvin), Dueiias and San Geronimo (Champion), 

 Chimaltenango (Conradt). 



Ten specimens. This insect is very closely allied to A. pruinosus, of which it may 

 be a colour-variety. The males apparently have longer antennae than in the corre- 

 sponding sex of A. pruinosus. None of the Mexican specimens of that species show 

 any tendency to a similar coloration of the thorax. A male from Dueiias is figured. 



3H2 



