266 JOURNAL, BOMBAY NATURAL HISTORY SOCIETY, Vol. XII. 



than twice the length of the hand-back and supplied with seven (six) 

 rows ot" teeth. 



Pectinal teeth 15-16. 



Measurements in millimetres. — Total length 37 ; carapace 4 ; tail 21. 



Locality. — Dehra Dun, Western Himalayas (8,01)0 feet). A single 

 specimen obtained by Mr. F. Gleadow. 



Differs from the previously described Indian species in having only 

 eight keels on the second caudal segment, and the sterna strongly 

 infuscate. With the Indo-Malayan forms, A. scutilus, Koch, A. 

 flavimanus, Thor., etc , which have the same number of keels in this 

 segment, there is no occasion to compare this species here. 

 Family V^jovid.e. 

 Chcerilus tricostatus^ sp. n. 



Colour (dry specimen) tolerably uniform reddish-brown, mottled 

 with black, paler below. 



Carapace closely granular laterally below the longitudinal keels ; 

 groove behind tubercle also granular, at least the anterior half of the 

 area in front of the tubercle gnmular, with sometimes scattered granules 

 extending almost back to the tubercle ; carapace shorter than the 1st 

 and 2nd caudal segments, about equal to the 2nd and 3rd, also 

 equal to the 5th. Terga finely granular throughout, a few coarser 

 granules along the posterior margin and a few more in front of these ; 

 the lateral keels distinct and granular, though short, on segments 3-7. 



Tail rather less than four times as long as the carapace, the 2nd 

 segment about as wide as long ; the keels normal, granular ; the upper 

 surface nearly smooth, at most finely granular, lateral and inferior 

 surface more coarsely granular ; vesicle normal in form, weakly gra- 

 nular behind on its lower side ; length of vesicle and uculeus a little 

 excelling that of the carapace. 



Sterna of abdomen smooth, except the last, which has a pair of 

 obsolete granular crests on each side. 



ChelcB. — Humerus smooth behind, granular elsewhere, the two 

 superior crests granular ; brachium with weakly granular crests, its 

 anterior surface smooth, with a few granules above ; hands rather 

 long and narrow, the length of the hand-back exceeding that of the 

 carapace, but not twice as great at the width of the hand, finely 

 granular, but provided with only three distinct wealdy granular keels 



