250 Mr. C. J. Galian on Longicorn Coleoptera 



them marked by three deep longitudinal grooves — one 

 median, not surpassing the eyes in front ; the remaining two 

 oblique, scarcely surpassing the eyes behind, and gradually 

 approaching in front so as almost to meet below between the 

 antennary tubers. The longitudinal smooth space on the 

 middle of the pronotum extends between the anterior and 

 posterior transverse grooves ; in its anterior half it is not half 

 as broad as in its posterior, and at its anterior extremity ends in 

 two small diverging tubercules. The elytra are each rounded 

 externally at the apex, cut in somewhat obliquely towards 

 the suture, and there furnislied with a very short spine. The 

 anterior cotyloid cavities are slightly open on the outside. 



Thomson's specimen is from Borneo ; the two in the British 

 Museum are one from Malacca, the other from Java. 



^OLESTHES, gen. nov. 



Head with a central plaque in front, with a median, more 

 or less distinct carina occupying the interantennary sulcus in 

 front, and extending behind almost to a level with the poste- 

 rior border of the upper lobes of the eyes. At the termination 

 of this carina the vertex bears a shallow foveolate impression. 

 Antennge in the male much longer than the body, with the 

 third to fifth joints thickened at the apex, with the joints from 

 about the fifth to the eighth usually furnished with a minute 

 spine at their outer apical termination. The same joints in 

 the female more distinctly spined externally, and each also 

 spinosely or denticulately produced at its inner apical termina- 

 tion. Prothorax strongly rugose above, rounded or subangu- 

 late and unarmed at the sides in the middle. Elytra clothed 

 with a rich silky pubescence giving moire reflexions ; apices 

 truncate, with the angles spinose or dentate. Anterior 

 cotyloid cavities very feebly or not at all angulate on the 

 outside. Prosternal process usually subtruncate behind. 



In addition to these characters may be mentioned a groove 

 which crosses the underside of the head from the base of one 

 cheek to that of the other. This groove (in the synopsis 

 given below styled the intergenal groove) is usually very 

 distinct, and its direction, whether straight or bowed back- 

 wards, is useful in separating some of the species. 



The species — some of them common enough in collections 

 — which I have comprised in this genus form a fairly com- 

 pact group. They are to be recognized by the richness and 

 lustre of their pubescence (with a sheen like that of shot silk) 

 taken in connexion with their roughly wrinkled and unarmed 



