342 Records of the Indian Museum. [Vol. XVI, 



and propodus each bear two carinae on their superior faces ; the 

 dactyli are flattened and in every instance shorter than the propodi. 

 In large males there is a dense patch of tomentum on the second 

 walking legs, extending from the middle of the carpus to the 

 distal third of the propodus ; in 3'oung males and females no trace 

 of this tomentum can be found. The basal segments of the legs 

 bear long plumose setae which retain fine particles of mud. 



The second segment of the abdomen of the male (text-fig. 

 15) is narrower than the first. The third and fourth are sepa- 

 rately rounded at the sides and about as broad as the first, the 

 fourth being a little the longer. The fifth segment is rather more 

 than half the breadth of the fourth and is only slightly constricted 

 near its proximal end ; at its narrowest point it is broader than 

 long. The sixth segment is twice as broad as long and is a little 

 wider than the fifth ; the seventh is triangular, broader than long 

 and rounded distally. The abdomen of the female (text-fig. 15) 

 is much broader than that of the male but is comparatively nar- 

 row at the base ; the fourth segment is the broadest ; the seventh 

 is triangular in shape and variable in its dimensions. 



In the largest male the anterior breadth of the carapace is 77 

 mm., its breadth 5'i mm. and the breadth of the front about 

 o"65 mm. In a large female these measurements are respectively 

 7*0, 4*7 and o"6 mm. 



The specimens are of a bluish-grey colour in spirit. 



"'-i-n-- Ivarachi. C. R. Stevens ; March. Twenty-eight. 



May, 1917. 



One of the females is ovigerous. The types bear the number 

 9796/10, Zool. Surv. Ind. 



Tympanomerus frater, sj). nov. 



This species is very closely allied to the preceding and differs 

 from it onl3" in the following particulars: — 



(i) The carapace (text-fig. 16) 

 ^^ / is in most respects closely simi- 



\ ^ ^ lar to that of T. stevensi ; but 



^j^^^^^^^^j^j55-^>^^ ^j_^^ lateral borders are slightly 



^0^ ^^^^ ^'^d evenly convex, with the re- 



1^-"-/^ ^•^f'; suit that the breadth across the 



1 ^ I middle is decidedly greater than 



, : \. that between the outer orbital 



^N^ ; - v .y angles. 



V _ . .^^^ .>" (ii) The front is very much 



^^"^ broader, between one sixth and 



Text-fig. 16.— Tjmpdi/nmerus One seventh the anterior breadth; 



frater, sp. no\ . its lateral borders are a little 



Carapace convergent anteriorly, not con- 



stricted as in T. stevensi. 

 (iii) The upper orbital border is decidedly sinuous and is 

 conspicuously concave in its outer half. 



