IS 1 Descriptions of new Ceylon Coleoptera. [no. 2, new series, 



26. Georyssus gemma. N. 



G. pygmcei statura et magnitudine, supra purpureo seneus, irides- 

 cens, subtus piceus ; alatus. Thorax subsemiorbicularis infra 

 apicem constrictus, sulco med. long, divisus, lateribus, basi apice- 

 que excavatus, impressionibus 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 ciliatae. 



In prov. central, montibus Kotmaliensibus alt. 3,500 ped. in ri- 

 vulorum ripis non infrequenter legi. 



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, resemb- 

 ling in shape very much those of a Libellula, have a few veins at 

 the base and are ciliated at the margin. I have moreover occasion- 

 ally taken insects of this g. flying about the light at night, but I 

 am not quite sure at present whether it was this species or another. 

 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 two basal impressions 

 and being itself divided by the longitudinal furrow ; two elevations 

 separating the anterior part of the basal impressions from that of 

 the central one (at the middle these three depressions are connect- 

 ed) ; 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 costae 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 



