some un described Gerrince. 147 



Euratas formidabilis, sp. n. 



Body above bluish, more or less finely greyishly pilose ; 

 antenna? black, finely pilose, base of first joint pale ochra- 

 ceous ; head with the apical and lateral areas pale greyish, 

 basal margin transversely linearly ochraceous but centrally 

 broken ; eyes castaneous brown, their basal margins dull 

 ochraceous; pronotum with two discal pale foveations, the 

 upper margins of which, and a central more or less connecting 

 line, are black; apical half of abdomen above paler and more 

 greyish in hue, the segmental margins darker ; anal appendage 

 blackish ; legs bluish, more or less greyishly pilose, the 

 anterior legs beneath ochraceously pilose, the acetabula, 

 abdomen beneath, and anal appendage more or less ochra- 

 ceous ; structural characters as in generic diagnosis. 



Length, c? 5 mm., ? 5 to 5£ mm. 



Hab. Andaman Sea (Indian Marine Survey — Alcock). 



Fabatus, gen. nov. 



Head large, declivous in front, subquadrate, obtusely 

 apically angulately produced and also distinctly angulate 

 on each side above the insertion of the antennse ; eyes of 

 moderate size, substylate, moderately emarginate at interior 

 margins, a little projecting beyond the anterior margin of 

 the pronotum ; antennas with the first joint longest, a little 

 shorter than the anterior tibia 5 , third shortest, second and 

 fourth subequal in length ; rostrum short, robust, not passing 

 anterior coxge ; pronotum shorter than head, transverse, the 

 lateral margins moderately rounded, posterior margin a little 

 concave; mesonotum elongate, convex, slightly more than 

 twice the length of pronotum ; anterior legs slightly thickened, 

 more so in the male than in the female, anterior tibias apically 

 inwardly spinous and in the male with a strong, robust spine 

 near middle, in female unarmed; intermediate and posterior 

 legs slender, intermediate considerably longer than the 

 posterior; the intermediate tibiae very strongly curved, inter- 

 mediate tarsi much longer than the posterior tarsi. 



This genus in general appearance somewhat resembles 

 the marine species represented by Halobates, but differs by 

 the emarginate inner margins of the eyes ; it is, however, a 

 truly marine species and I retain it in the Halobatinaria. 

 I have as yet only seen undeveloped forms, collected by 

 Dr. A'.cock on the Indian Marine Survey. 



Fabatus servus, sp. n. 

 Head ochraceous with a broad central longitudinal spot 



