536 Entomological Papers. [No. 6. 



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 

 insects of this g. flying about the light at night, but I am not quite 

 sure at present whether it was this or any other species. The 

 sculpture of the thorax is complicated and difficult to describe, how- 

 ever, the leading features in it are these : a subapicai 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 subapicai 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 connected) ; 

 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 costae of the back are 

 11 in number, the suture lying in the central one. The half of this 

 central costse 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 interrupt- 

 ed near its base by the subhumeral cavity, runs on, but does not 

 reach as far as the former ; the 4th 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 costse is obtusely dentated. The 

 ^terstices are marked with large, shallow, transverse impressions. 

 The head of the insect is rather large and even. The mandibles are 

 furnished with an obtuse subapicai tooth, the two lower thirds are 

 ciliated. The maxillae have the apex of the outer lobe externally 



