XXVII. ON SOME CAVERNICOLOUS DER- 



MAPTERA AND ORTHOPTERA 



FROM ASSAM. 



By h. Chopard, D.Sc. 



(Plates XXI— XXIII.) 



Ill a previous paper {Mem. As. Soc. Beng. VI [tqiq], pp. 

 339-396) I described a Diestraimnena from Cherr^punji which was 

 the first, cavernicolous Orthopteron collected in that region of 

 India. Since then, Dr. N. Annandale has had the kindness to send 

 me another collection of Orthoptera fiom caves in Assam, contain- 

 ing the following species: — 



Forcipula trispinosa, Dohrn, Siju Cave. 



Chelisoches morio, F , Siju Cave. 



Spelacohlalta (?) caeca, sp. nov. , Rupmath Cave. 



Rhaphidophora rujobrunnca, sp. nov., cave near Yawnghwe. 



Diestrammeiia brevifrons, Chop., Rupmath Cave. 



Diestrajnmena mdica, sp. nov., cave near Yawnghwe. 



Tachycincs adcliingi, sp. nov., Ngot bat Cave. 



Arachnominius sp., Siju Cave. 



It may be seen from this short enumeration how little known 

 this cavernicolous fauna is. The Blattid hereafter described is 

 particularly of great interest, being completely blind and showing 

 remarkable characters of adaptation to cavernicolous life. 



DERMAPTERA. 

 The two species of Dermaptera here referred to, as well as 

 the other few species of this group recorded from caves in various 

 parts of the world, are common lucicolous species. They do not 

 show anj' character of adaptation to cavernicolous life but seem 

 nevertheless quite well accustomed to this special habitat. In 

 fact both of them are represented by a certain number of indivi- 

 duals of both sexes and by immature stages which proves that 

 they live completely and reproduce themselves inside the caves. 



Fam. FORFICULIDAE. 



Subfam. LABIDURINAE. 



Gen. Fcrcipuhn, Bolivar. 



Forcipula trispinosa, Dohrn. 



Siju Cave, Garo Hills (R. Friel, Nov. 1917) ; 2 o- , 4 9 , 2 young 

 individuals. 



This species is found outside of caves in the north of India. 



