CHALCOLEPIDIUS. — SEMIOTUS. 287 



differ from the females in having the antennae more strongly serrate, and the anterior 

 tibiae armed with about ten fine sharp teeth. The tibiae in both sexes are armed with a 

 few short teeth, those on the anterior pair being longer and more numerous in the males. 

 The upper surface is uniformly clothed with minute greenish scales, but in the Vene- 

 zuelan type a few elongate whitish scales (as noted by Candeze 3 ) are distinctly visible 

 along the elytral margins. A male of a colour- variety from Tole is figured. 



31. Chalcolepidius dugesi. (Tab. XII. fig. 19, $ .) 



Chalcolepidius dugesi, Cand. Bull. Soc. Ent. Belg. 1886, p. lxx 1 . 



Hab. Mexico, Sonora {coll. Janson), Tupataro in Guanajuato [Luges 1 , Hoge). 



We are indebted to Dr. Candeze for a specimen of this very distinct species, which we 

 figure ; we have also received another from Herr Hoge, and there is a third in the 

 Janson collection, all females. The antennae are described as subpectinate in the male. 



32. Chalcolepidius tenuis. (Tab. XII. fig. 20, $ .) 



Very elongate, narrow, subparallel, Mack, uniformly clothed above and beneath with minute brownish- 

 cinereous scales. Head densely punctured, very broadly triangularly depressed in front ; antennae strongly 

 serrate, the third joint small, very short, not half the length of the fourth, acutely triangular. Prothorax 

 about one-fourth longer than broad, convex ; the sides subparallel to near the apex, abruptly obliquely 

 converging in front, slightly sinuous at the middle, and strongly sinuate before the base ; the hind angles 

 thickened, abruptly and strongly divergent, sharp; the margins very narrowly reflexed; the base with an 

 obtusely bidentate median lobe ; the surface densely, minutely punctate and with scattered coarse 

 punctures intermixed at the sides and upon the anterior part of the disc. Scutellum strongly transverse, 

 densely punctured. Elytra nearly twice the length of the prothorax, subparallel to beyond the middle 

 and gradually narrowing thence to the apex, the apices conjointly rounded, the sutural angle rather 

 sharp, the marginal carina not reaching the base ; deeply punctate-striate, the punctures closely placed 

 and not hidden by the scales ; the interstices equal in width, convex throughout, densely, very finely 

 punctate. Beneath densely punctured, the prosternum and the middle of the meso- and metasternum 

 smoother and almost glabrous. Propleuree obsoletely grooved on the inner side before the apex. 



Length 24£, breadth 6| millim. ( $ .) 



Hab. Mexico, Oaxaca (Hoge). 



One rather worn female specimen. This species has quite the facies of the North- 

 American C. viridipilis, from which it differs in the transverse scutellum and the 

 abruptly divergent hind angles of the thorax, characters bringing it near C. dugesi. 

 Dr. Candeze has returned the insect to me as unknown to him. 



SEMIOTUS. 



Semiotus, Eschscholtz, in Thon's Archiv, ii. 1, p. 31 (1829) ; Candeze, Monogr. Elat. i. p. 292. 



Eighty members of this purely American genus are enumerated by Dr. Candeze in 

 his Catalogue, but it is probable that several of them are nothing more thtin local 

 varieties of widely distributed species. With one exception, the Chilian S. luteipennis, 

 Guer., all are from the tropical portions of the continent. Compared with Chalcole- 

 pidimy Semiotus is poorly represented in Central America, it having eight species only. 



