Ceylon Coleoptera, &fc. 



25 



us, sulco nied. long, divisus, lateribus, basi apiceque excavatus, impress- 

 ionibus 3 majoribus dorsalibus, 2 minoribus lateralibus. Elytra fortissime 

 costata, costis obtuse dentatis, in interstitiis transversim punctato-impressa, 

 ad humeros profunde excavata, infra medium leviter sinuata. Tibiae 

 extus spinulosse, intus sparsim ciliatse. 



Prop'e ISTegombo in ripis Mahse-Oyse fluvii non infrequenter et per 

 occasionem nocte ad lumen cepi. 



Lacordaire and others characterize the g. Georyssus as 

 having the elytra soldered together and being destitute of 

 wings. In 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; 3 larger dorsal 

 depressions ( 1 central, 2 obliquely basal) and 2 smaller lateral 

 ones at the subapical sinuosities — a short elevated ridge at 

 the centre of the base separating the 2 basal impressions and 

 being itself divided by the longitudinal furrow; 2 elevations 

 separating the anterior part of the basal impressions from that 

 of the central one (at the middle these 3 depressions are con- 

 nected) ; 2 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 costse 

 of the back are 1 1 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 



1857c E 



