40 GNAPHALORYX PERFORATUS. 



The head is large, larger than the thorax; the sides are 

 nearly straight, subparallel, inconspicuously convergent 

 towards the base ; the ocular canthus is narrow , straight 

 on the outside, and entire; the space between the eyes 

 and the produced lateral angles of the thorax is flattened 

 in a perpendicular direction ; the front margin of the head 

 is regularly concave, perforated in the middle (above the 

 bidentate clypeus) by a large and deep circular hole, and 

 has the lateral angles rounded ; the vertex is provided with 

 an elongate horn which is directed forwards, and slightly 

 curved downwards at the tip. The mandibles are slender, 

 about as loug as the head and thorax together, slightly 

 curved , furcate at the tip ; the upper tooth of the furcation 

 very blunt and curved, the lower tooth pointed and more 

 developed in the right than in the left mandible; the fur- 

 cation is preceded in both mandibles (of which the right 

 one is a little shorter than the left one) by two teeth of 

 different size ; in the left mandible the distance between 

 these teeth and the furcation is considerably larger than in 

 the right one, and in the latter the median or smaller 

 tooth is only indicated by a small tubercle; on the up- 

 persurface of the apical half of the mandibles a raised smooth 

 line may be observed. — The prothorax anteriorly a little 

 wider than the base of the head, the latter being more 

 or less embayed between the anterior angles which are produ- 

 ced and rounded; the front margin is bisinuate, the basal 

 margin straight with rounded lateral angles ; the sides are 

 straight, convergent towards the base. In the hind corners 

 an oblique impression is present; it touches the basal mar- 

 gin and is bounded laterally by two divergent ridges. The 

 middle of the disk is flatfish. — The elytra are about as 

 broad as the base of the thorax , and one and a half as 

 long as broad. — The prosternum is longitudinally impressed 

 between the coxae. The rather short anterior tibiae are 

 armed on the outer margin with five teeth (besides the two 

 apical ones) of which the first is very small and the second 

 and fourth smaller than the third and fifth ; the four pos- 



Notes from the l^eyden DMnseuxn , "Vol. VII. 



