460 COLYDIIDA. 
The coste of the elytra are very marked; the intervals are depressed, the sculpture in 
them rather obscure. The legs are stouter than in the allied species. Eleven specimens. 
6. Bitoma gracilis. 
Gracilis, depressa, fuscescens ; antennis pedibusque testaceis ; elytris rufo-testaceis, medio transversim fusces- 
centibus. 
11: 
Long. 27 millim. 
Hab. Mexico, Northern Sonoro (Morrison), Vera Cruz (Sallé), Tehuantepec (Hége) ; 
GUATEMALA, Paraiso (Champion). 
Antenne yellow, with large club. Epistome not at all emarginate, rounded at the 
sides. Thorax conspicuously narrower than the elytra, very obscurely crenulate at 
the sides; with the usual coste, which, however, are not so strongly raised as in the 
allied species, but with the minute setosity. more’ distinct, pallid. Elytra yellowish or 
with a tinge of red, with a more or less distinct mark across the middle, and also the 
sides dark; with the usual coste strongly raised, finely ciliate, the sculpture of the 
deep broad intervals coarse. 
The few specimens we have received of this insect I am unable to reduce to a 
variety of any of the other species ; they are much narrower than B. subfasciata, and 
differently sculptured; they have the antennal club as large as in B. socialis, but 
have the thoracic sculpture much less marked, besides differing in the arrangement 
of the colours. 
7. Bitoma sulcata. 
Ditoma sulcata, Leconte, Proc. Acad. Phil. 1858, p. 63’; Horn, Proc. Am. Phil. Soc. xvii. 
p. 566 *. 
Hab. Norta America, California and Arizona ?.—Muxico, Northern Sonora 
(Morrison). 
Although this insect has entirely the appearance of a typical Bitoma, it nevertheless 
adds considerably to the difficulty of defining the genus, as the club of the antenna is 
intermediate between the 2- and the 3-jointed forms, and the antennary grooves are 
more distinct. In another structural character, B. sulcata approaches Xuthia: it 
possesses a fine interocular margin, which is entirely wanting in B. ornata and the 
more typical species of the genus. 
8. Bitoma jejuna. (Tab. XIV. fig. 20.) 
Bitoma jejuna, Pascoe, Journ. Ent. i. p. 102*, and ii. p. 827. 
Capite utrinque supra oculum marginato. Ferruginea, subdepressa ; prothorace elytrisque costatis, illo haud 
transverso. 
Long. 24 millim. 
