197 
the genus Hesycha, as far as structure is concerned. All the 
species, however, are more linear in form than the Hesychce, and 
the antennae in nearly all are more nearly approximated at their 
bases. The head is variable in width, and the forehead is some- 
what convex in the middle; the latter is in most species clothed 
with pale-coloured tomentum. The antenniferous tubercles, in 
the broader-headed species, have prominent and sometimes 
cornuted inner angles. The antennae themselves are slender 
and setaceous, in the males often twice the length of the body ; 
their basal joint is clavate, and the third joint, with few excep- 
tions, a little curved. The thorax is cylindrical and uneven, 
never short and broad. The elytra are linear, obtusely rounded 
at the apex, free from centro-basal elevations and tubercles ; the 
shoulders are prominent and acute, and curved anteriorly. The 
legs are moderately short, the thighs clavate, the claw-joint ro- 
bust, as is universal in the Oncideritse, and equal in length to 
the three remaining taken together. 
The Trestonice, like the other genera of the present group, 
are found on branches of trees, clinging closely and gnawing the 
bark and surface-wood. 
1. Trestonm Chevrolatii. 
Trestonia Chevrolatii, Buquet, Thoms. Arc. Nat. p. 46. 
T. elongata, subdepressa ; capite lato, tomento flavescente dense ves- 
tito, maculis duabus verticis alterisque frontalibus nigris, genis et 
gula nigricantibus ; an tennis basi distantibus, brunneis, tuberculis 
antenniferis intus modice productis acutis ( $ ) ; thorace obscure 
fusco-grisescente, supra transverse ruguloso sulcis duobus trans- 
versis juxta marginem posticum distinctioribus ; elytris postice 
paulo attenuatis, dorso depressis, humeris subconicis, granulatis, 
disco bicostato lineaque elevata suturali, punctatis, griseis, ante 
apicem utrinque plaga curvata nigra (antice albo marginata), dein 
fulvo-bmnneis macula subapicali pallida ; corpore subtus pedibus- 
que viridi-griseis, abdomine ferrugineo-brunneo, segrnentis tribus 
posterioribus lateribus ochraceis. Long. 10 lin. 5 . 
One example, taken at Ega, and named as above, from the 
typical specimen formerly belonging to M. Chevrolat. It would 
be impossible to determine the species from the meagre descrip- 
tion of M. Buquet. 
2. Trestonia ramuli, n. sp. 
T. elongato-oblonga, postice ( cT ) angustata, subdepressa, fusca, fulvo 
variegata ; elytris medio macula magna lateral! viridi-cinerea 
postice dentata et fusco marginata, intra apicem macula distinc- 
tiore fulva ; tuberculis antenniferis distantibus, intus utroque sexo 
prominulis acutis ; antennis corpore paulo longioribus, articulo 
tertio curvato. Long. 6-6 1 lin. c? ? • 
Head moderately broad, forehead punctured, dingy brown 
