428 SEEEICOENJA. 



front of the former and the anterior margin and hind angles of the latter testaceous or rufo-testaceous ; 

 the scutellum fusco-testaceous or pieeous ; the elytra testaceous or flavo-testaceous, with the suture, and 

 the sides broadly from a little below the shoulder to about the middle and narrowly thence to the apex, 

 pieeous ; beneath in great part pieeous ; the antennse black or pieeous, with the two basal joints paler ; 

 the legs flavo-testaceous. Head closely, finely punctate, depressed in the middle in front in some specimens ; 

 antenna? slender, about two-thirds the length of the body. Prothorax broader than long, about equal in 

 width at the base and apex, widest a little before the middle, the sides rounded anteriorly and strongly 

 sinuate behind ; the hind angles rather narrow ; the surface closely, finely, uniformly punctate ; the 

 base bi-incised on either side. Elytra nearly three times the length of the prothorax, and wider than it 

 at the base, slightly rounded at the sides, narrowing from about the basal third, the humeri rounded ; 

 sulcate, the sulci with irregular double rows of fine punctures, the interspaces convex and with a few 

 scattered punctures, the alternate ones becoming subcostate before the apex. Beneath closely, finely 

 punctate. Fourth tarsal joint sublamellate. Claws bicuspid. 

 Length 3^-3|, breadth g-1 millim. ( S •) 



Hab. Guatemala, El Tumbador, Las Mercedes, and Cerro Zunil {Champion). 



Eight specimens, all from the Pacific slope, and from elevations between 3000 and 

 5000 feet. Smaller, narrower, and more slender than T. trivittatus, the thorax with 

 the anterior margin and hind angles only testaceous, the fourth tarsal joint less dilated. 

 The elytra are similarly coloured. 



A male from Las Mercedes is figured. 



HORISTONOTUS. 



Horistonotus, Candle, Monogr. Elat. iii. p. 243 (1860) ; Cat. Method. Elat. p. 135 (1891). 



Amongst the Tropical-American Cardiophorini this genus is the most numerous in 

 species, and it is also well represented in the Southern States of North America. 

 Twenty are now recorded from within our limits, fifteen of which are described as new. 

 They belong to four well-defined groups, easily separable by the form of the tarsal 

 claws. The first two would perhaps be better treated as generically distinct. The 

 tarsal claws in the first group, which includes H. eocoletus and its allies, are bicuspid, 

 and also dilated towards the base ; they are formed exactly as in some of the species of 

 Triplonychus, i. e. T. cingulatus, Cand., T. trivittatus, and T. parvulus. The single 

 species of the second group, II dilaticornis, differs from all the others in the form of 

 the front and antennae, as well as in the form of the claws. In one species of the third 

 group, H. apterus, the body is not winged, this insect approaching very closely the 

 genus Coptostethus. 



a. Claws bicuspid, the teeth subequal in length ; prothorax with the base 

 bi-incised on either side, the punctuation mixed ; antennas slender ; frontal 

 carina prominent ; scutellum concave. 

 a'. Alternate elytral interstices costate before the apex. 

 a". Elytra narrowing almost from the base. 



a'". Elytra deeply punctate-striate ; the interstices convex throughout . exoletus. 

 b'". Elytra shallowly and finely punctate-striate ; the interstices feebly 



convex or almost flat on the anterior half pedestris. 



