436 SEEEICOKNIA. 



behind ; the hind angles rather short ; the surface thickly, very finely punctate, with slightly coarser 

 punctures intermixed ; the base sinuate and bi-incised on either side. Elytra about two and one-third 

 times the length of the prothorax, and of the same width at the base, a little rounded at the sides, 

 narrowing from the middle, the humeri rounded ; coarsely punetate-striate, the interstices convex and 

 very sparsely, finely punctate. Beneath closely, very finely punctate, with scattered coarse punctures 

 intermixed. Claws broadly and sharply toothed at the middle. 

 Length 7, breadth 2| millim. 



Hob. Mexico, Tepetlapa in Guerrero (R. H. Smith). 



One specimen, probably a female. This insect resembles H. mixtus, but it has the 

 thorax more convex, with the sides more rounded and the larger intermixed punctures 

 much finer ; the punctures of the elytral stripe are coarser, and the interstices more 

 convex. It is more shining than H. duplicatus, with the pubescence sparser and finer, 

 the thorax more rounded at the sides, and more sparsely punctate. 



14. HoristOllOtUS bicinctus. (Tab. XIX. tigg. 16, S ; 16 a, prothorax.) 



Moderately elongate, not very convex, shining, rather sparsely clothed with fine yellowish-cinereous 

 pubescence; pitchy-black, piceous, or brown, the head rufous in front, the prothorax with the anterio 

 margin or the anterior angles testaceous, the hind angles and the scutellum sometimes of the same colour ; 

 the elytra each with a large patch on the disc at the base, sometimes extending completely across, and an 

 angulated fascia beyond the middle, rufo-testaceous or rufous ; beneath in great part piceous, reddish at 

 the sides ; the legs and antennas testaceous. Head somewhat coarsely punctate ; antennas slender, more 

 than half the length of the body in the male. Prothorax considerably broader than long, much wider at 

 the base than at the apex, moderately rounded at the sides, somewhat obliquely narrowed in front and 

 behind ; the hind angles moderately produced ; the surface thickly, very finely punctate, with a few 

 intermixed coarser punctures towards the apex ; the base bi-incised on either side. Elytra about two 

 and one-half times the length of the prothorax, and slightly wider than it at the base, distinctly rounded 

 at the sides, narrowing from a little before the middle, the humeri rounded; rather deeply punetate- 

 striate, the interstices feebly convex and minutely punctate. Beneath closely, finely, uniformly punctate. 

 Claws rectangularly dilated from the middle to the base. 



Var. a. The post-median fascia of the elytra almost obsolete. 



Var. /3. Brown or reddish-brown, the elytra with the base narrowly and indeterminately rufescent. 



Length 5-5£, breadth 14--2 millim. ( <$ $ .) 



Hob. Guatemala, San Juan in Vera Paz (Champion) ; Panama, Volcan de Chiriqui 

 (Champion). 



Twelve specimens — five of the typical form and two of the var. a, from Vera Paz, 

 and five of the var. j3 from Chiriqui. Allied to the South-American II. crucifer, Cand., 

 but without the long sulcus on either side of the base of the thorax. The head and 

 thorax are almost uniformly punctate, the intermixed larger punctures being distinct 

 at the apex only ; the punctures on the head, however, are coarser than those on the 

 thorax. A tvpical male from San Juan is figured. 



15. Horistonotus nigricornis. 



Moderately elongate, narrow, shining, sparsely clothed with rather coarse yellowish-cinereous pubescence; 

 pitchy-black, the anterior angles of the prothorax testaceous, the humeri indeterminately brownish; the 

 antenuje pitchy-black ; the apical joint of the maxillary palpi piceous, the legs flavo-testaceous. Head 



