312 ERNKST WARKEN. 



which is marked externally by a cluster of seta3. This maxillary 

 palp differs considerably from that of Termitomimus, where 

 there are 4 joints, and the last minute joint is place terminally 

 on a wide i-acket-shaped 3rd joint. On the other hand the 

 1st maxilla of Paracorotoca agrees in all essential points 

 with that of the Singapore genus Termitoptochus. 



Second Maxilla or Labium. — Submentum (cardo) more 

 or less membranous and continuous with gular region; mentum 

 (stipes) chitinous and provided with a few conspicuous seta? ; 

 distally there is a bilobed plate which may be regarded as 

 beino- formed by the fusion of ligula on the anterior surface 

 with palpigers on the posterior surface ; the typical two pairs 

 of lobes or paraglossaa (lacinia aud galea) are not present. 

 The labial palps on the posterior surface are remarkably 

 reduced, they consist simply of two small tubercles bearing 

 a small clump of long set^e. The edges of the bilobed plate 

 bear a number of rows of short, scale-like seta3 which produce 

 a rasping surface (PI. XVII, fig. 24). On the anterior face, 

 which may be called the ligula surface, there is a curved 

 row of short conspicuous setae on each side. The labiums 

 of Termitoptochus and Termitomimus are closely 

 similar. The labium of Corotoca is less specialised, since 

 from Schiodte's figure it may be judged that the palpigers 

 and ligula are separable and the palps are 3-jointed. 



Neck. — The neck is short. In the mid-dorsal line imme- 

 diately in front of the pronotum the back of the neck or the 

 front of the prothorax is produced into a translucent bilobed 

 swelling. The lobes lie on the two slight concavities of the 

 occiput of the head. The cuticle on the ventral surface of 

 these lobes is roughened by the presence of minute tooth-like 

 scales (PI. XVII, figs. 30 and 31). This swelling would seem 

 to be exudatory in nature, and any fluid actually diffusing 

 through it would collect as a drop in the basin-like depressions 

 of the occiput. An essentiallj^ similar structure is described 

 by Tragardh in Termitomimus, and Wasmann mentions 

 the occurrence of an analogous swelling in the termitophilous 

 Scarabseid, Cheetopisthes heimi Wastn. 



