MICEOVELIA. 141 



at inner margins of eyes ; extreme apices of the femora and some- 

 times the intermediate and posterior tibiae more or less infuscate; 

 lateral angles of the pronotum broadly subprominent. 



Fig. 77. Me. 



Length 2 millim. 



Hob. Lower Bengal ; Port Canning (in brackish pools). 



Subfamily GERRIN^E. (Vol. II, p. 175.) 



Since I previously enumerated the British Indian genera and 

 species of this subfamily our knowledge of the Gerrinae has been 

 very considerably increased. This is almost entirely owing to the 

 collections recently made by Dr. Annandale, who has given so 

 much attention to the fauna of the brackish and fresh waters of 

 India, and also to the oceanic species collected by the Indian 

 Marine Survey. 



As regards the divisional lines between the Gerrinaria 

 (vol. ii, p. 176) and the Halobatinaria (vol. ii, p. 186), besides 

 the characters given by Bianchi as already recorded, attention 

 must be drawn to the structure of the eyes, a character originally 

 pointed out by Mayr. In the Gerrinaria the ocular orbita is 

 arcuately sinuate behind the middle, and in the Halobatiuaria the 

 inner margins of the eyes are convexly rounded. These characters 

 are useful, and generally but not universally applicable as may be 

 seen in the genus Fabatus of this fauna. They have been some- 

 what insistently advocated by Bergroth, but this critical writer 

 avoids the responsibility of faunistic work and thus enjoys the 

 privileges of a free-lance. 



