230 LUCANID^. 



2nd joint globular, 3 and 4 about as long as wide, 5-7 very 

 short and compact, 8-10 forming an abrupt short club, the 

 club-jomts soft, not polished. Sides of head beneath longi- 

 tudinally keeled, the antenna scape occupying a groove between 

 the keel and eye. Eye small, not prominent, entire. Labrura 

 small, tongue-like with terminal tuft of long hairs. Mandibles 

 close together, not reaching the sides of the head. Maxillae 

 reduced, narrow, unarmed in both sexes, the 2nd and 4th joints 

 of maxillary palpi moderately long. Mentum transversely 

 hexagonal ; the ligula attached in front, not concealed, very 

 small, notched, not bilobed ; palpi with 1st joint minute, 

 2nd very long, 3rd much shorter. Pronotum entirely margined, 

 the lateral and basal marginal grooves deep, the base almost 

 straight, closely fitting the base of the elytra, the basal angles 

 sharjD. Scutellum wide, almost semi-circular. Elytra convex, 

 almost parallel-sided, striate. Prosternum neither elevated nor 

 produced behind. All the coxse contiguous, the front ones 

 extremely promment. Front femur bearmg a wide patch of 

 silky golden hairs on its front face. Front tibia finely serrate 

 externally, with sharj:) teeth at intervals set at right angles, the 

 extremity not forked. Middle and hind tibiae bearing several 

 spines externally and truncate at the extremity. All the 

 tarsi short and slight, clothed with long hairs beneath. Pul- 

 villus well developed. Abdomen loosely articulated . 



(^. The prothorax is short, broad and dilated in front. The 

 head is broad, the mandibles long, not flat, a little hollowed 

 internally, and clothed there with long liorizontally-directed 

 hairs. IBoth maxillary and labial palpi are long, the former as 

 long as the antennae. 



The genus Ceruchus difiers in many important pomts of its 

 structure from all other Indian genera. Its members are of 

 small size, but, inilike other genera, the species of which are 

 small, the two sexes are very dissimilar. The most obvious 

 peculiarity is in the attachment of the legs to the body, all three 

 pairs being in contact in the middle line and the front coxae 

 protruding vertically. The close correlation of the base of the 

 prothorax with the bases of the elj-tra seems to allow less 

 lateral movement than usual. The organs of the mouth also 

 diverge greatly from the normal form. Both maxilla^ and 

 labium are much reduced and seem only to form sui)ports for 

 the ])alpi. The proportions of the joints of the labial ])alpi are 

 quite distinctive, as also is the elongation of all the palpi in the 

 male. The strong ridge })rotecting the antenna on each side 

 of the head beneatli is ah o remarkable. 



Key to the Species (males). 



Elytra very lightly striate-punctate, the inter- 



vals scarcely eon\'ex (ifnnis Fuirm., p. 2^1. 



Elytra deeply groo\-ofl. with strongly ronve.x 



intervals fiinensis Nagel, p. 232. 



