No. 9. — 1856-8 ] new ceylon coleoptera. 



23 



Prope Negombo in ripis Mahse-Oyse flnvii non infrequenter et per 

 occasionem nocti ad lnmen cepi 



Lacordaire and others characterize the g. Qeoryssus as 

 having the elytra soldered together and being destitute of 

 wings, fob the present species, however, the elytra are unconnected 

 and cover wings proportionately larger than in any other beetle I 

 can at present think of They are elongated and comparatively 

 narrow, resembling in shape very much those of a Libellula^ 

 have a few veins at the base, and are ciliated at the margin. 

 I have moreover occasionally taken this insect flying about the 

 light at night. The sculpture of the thorax is complicated 

 and difficult to describe. However, the leading features in it 

 are these : a subapical sinuosity on either side ; a longitudinal 

 furrow ; excavated sides, base and apex ; three larger dorsal 

 depressions (one central, two obliquely basal) and two smaller 

 laternal ones at the subapical sinuosities — a short elevated ridge 

 at the centre of the base separating the two basal impressions 

 and being itself divided by the longitudinal furrow ; two eleva- 

 tions separating the anterior part of the basal impressions from 

 that of the central one (at] the middle these three depressions 

 are connected); two small rugosities near the anterior margin, 

 one on either side of the longitudinal furrow. 



The sculpture of the elytra is less complicated. They have 

 a deep cavity at the shoulder, a large but not deep sinuosity 

 below the middle, and are obtusely acuminated. The costee 

 of the back are 11 in number, the suture lying in the central 

 one. The half of this central costa and the exterior margin 

 form an elevated border round either elytron. The first and 

 second on either side run towards the apex, but come to a stop 

 (very abrupt in most, but less so in some specimens) before 

 reaching it ; the third, after having been interrupted near its 

 base by the subhumeral cavity, runs on but does not reach as 

 far as the former ; the fourth does not leave the region of the 

 shoulder ; the last on either side is very prominent at the base, 

 but soon forms an abrupt declivity and runs on as a low ridge 

 to below the middle. The back of all these costas is obtusely 

 dentated. The interstices are marked with large, shallow, 



