Our knowledge of the early stages of the family is but Beauty, espe- 

 cially as concerns tropical species. All that is known on behalf of the 

 latter is based on Indian material : see Nowrojcc, Mem. Dept. Agric. 

 Ind., Ent. Series II, IX. 177 PI. 26 f. 4-7 (1912) ; Lcsne, Bull. B. E. 

 Fr. 86 (1902) ; Ocbu, Rec. Ind. B|us. XXXI 244 (1929). 



The literature on this family is very scattered and there exists up 

 to now no key to species. Most of the Indian species are treated in 

 the Monograph of Dr. M. Regimbart (Annalea de la Societe Entorno- 

 logiquo de France 1882, 1883, 1886, 1891, 1907). 



1 



Key to subfamilies. 



'Last abdominal segment short, rounded at tip, with- 

 out a median longitudinal iow of hairs below. No 

 pubesconco on pronotum and elytra ... 2 



Lajst abdominal segment elongato, conical, with a 

 median longitudinal row of hairs below. Elytra 



^ and pronotum pubescent at loast laterally . .III. Orectoihilina;. 



fMetaeoxa? outwards at loaBt as broad aa at the median 



future, tlio outer (deeper) portion much broader 



than the inner portion, which adjoins the metas- 



temurn ; outer portion of metasternum very nar- 



2-< row ......... I. Gyrininse. 



Metacoxae outwards narrowor than at the median 

 suture, the outer portion narrower than the inner 

 one ; outer portion of metasternum in form of a 

 large triangle ....... II. Enhydrin.t. 



By the older authors many species of Gyrinidse are, evidently by 

 error, recorded from India, which can never be found there, i.a., Gyrimis 

 indicus Auhe—ojxu:us Sahib., which has a boreal range. In the follow- 

 ing catalogue I have omitted all these, and only such species are regis- 

 tered, which are certain to occur in the region which is treated h< re. 

 Records, which, are marked by an asterisk, are not yet pubbshed in 

 literature and result from revisional work, which was done by me on 

 many Earopem collections and on the material of most of the public 

 collections of India. 



GEORG OCIIS. 



FnANKFURT A. MAIW, 



20th November 19Z9. 



