298 ERNEST WAREEN. 



PAGE 



V. The Supposed Larva OF Pakacorotoca AKERMAN I. 344 



1. External Morphology . . 344 



2. Internal Anatomy .... 346 

 YI. Comparison of Larva and Pakacorotoca Imago . 351 



YII. Specialisation Associated with the Termitophilous 



Habit . . . .352 



Explanation of Plates XVI-XXI . . .356 



INTEODUCTION. 



In 1914 the writer gave a brief diagnosis of a new termito- 

 philous Aleocharine Staphylinid from Natal. ^ The beetle is 

 extremely physogastric^ and it was referred to the remarkable 

 American genus Corotoca and named C. akermani. A 

 more detailed examination of the species, however, has brought 

 to light certain differences, and it is now thought to be 

 advisable to found a new genus which, on account of its great 

 external similarity to Corotoca, is named Paracorotoca, 



In the present j)aper the anatomy and histology of Para- 

 corotoca akermani (Warren) is given in certain detail on 

 account of the fact that hitherto only a brief description of 

 the external morphology of the similarly modified genus 

 Corotoca has been published.- In order to appreciate fully 

 the nature of the modifications induced by the termitophilous 

 habit in Paracorotoca a full knowledge is required of the 

 structure of the most closely allied free-living genera of 

 Aleocharine Staphylinids. I have been unable to trace any 

 very helpful literature in this connection, and consequently 

 for the present the significance of some of the anatomical 

 characters must remain doubtful. 



A comparison of the anatomy of Paracorotoca with that 

 of TrJigardh's Termitomimus entendveniensis ^ from 



' Warren, E., " Note on the Occurrence in South Africa of a Termito- 

 philous Beetle of the Genus Corotoca," 'Ann. Natal Museum,' vol. 

 iii, pt. i, p. 103, 1914. 



2 Schiodte, J. C, ' Corotoca og. Spirachtha,' Kjobenhavn, 1854. 



^ Ti'jigclrdh, Ivar, "Description of Termitomimus, etc.," ' Zoo. Stud, 

 titlag. T. Tulberg,' Upsala, 1907. 



