DICHELASPIS WARWICKII. 121 



double, forming a considerable rectangular projection, 

 as in the terga of Lcpas ; scutal margin deeply excised at 

 a point corresponding with the apex of the scuta, a flat 

 tooth or projection being thus formed ; there is some- 

 times a second tooth (fig. 6 b) a little above the basal 

 point. The terga, in the first variety, somewhat resemble 

 in shape the scuta of Conchoderma aurita. 



Carina, much bowed, narrow, slightly concave within, 

 (in the Borneo specimen, rather wider and more con- 

 cave,) extending up between the terga for half their 

 length, terminating downwards in a rectangularly in- 

 flected, deeply imbedded, oblong, rather wide, flat disc, 

 at its extremity more or less deeply notched. This disc 

 is externally smooth ; internally it sometimes has two 

 divergent ridges on it; it extends across about two- 

 thirds of the base of the capitulum (fig. 6 a, as seen 

 from beneath, when the peduncle is cut ofT), to under 

 the middle of the basal segments of the scuta. 



Peduncle, narrow, flattened ; united to the capitulum 

 some little way below the scuta; about as long as the 

 capitulum ; the membrane of which it is composed is 

 thin, externally studded with bluntly conical beads of 

 yellowish chitine, of which the largest were —^ of an 

 inch in diameter; on their internal surfaces these are 

 furnished with a small central, circular depression, appa- 

 rently for a tubulus ; the arrangement of the beads varied 

 in concentric zones. Similar conical points on the capi- 

 tulum have an internal concave surface about ^ in 

 diameter, with a central circle y^oo in diameter, for the 

 insertion, as I believe, of a tubulus. 



Size. — The largest specimen had a capitulum a quarter 

 of an inch long. 



Mouth. — Labrum highly bullate ; crest with not very 

 minute, blunt teeth, which towards the middle lie closer 

 and closer to each other, so as to touch. Palpi rather 

 small, with a few very long bristles at the apex. 



Mandibles, narrow, produced, with four teeth, and the 

 inferior angle tooth-like and acuminated ; in one spe- 



