20 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 98 



flattened, roughly rounded lobe with denticulate or small tuberculate 

 margin. 



The posterior border of the propodus of the fifth or swimming leg 

 is armed with spinules. As viewed from above there are four short, 

 stout, acute spinules — one could well call them spines — on the right 

 propodus this side of the close-set fringe of long hair that marks the 

 anterior (upper) margin of the joint and a single one the other side, 

 behind the fringe of hair, inserted proximal to the proximalmost of 

 the four spinules dorsal to the fringe of hair ; on the left propodus 

 there are eight spinules above or dorsal to the fringe of hair and three 

 behind, these three are inserted distal to the second of the spinules of 

 the upper side ; the first two spinules on the upper side of the fringe of 

 hair on the left propodus are colorless, small, and relatively incon- 

 spicuous for that reason ; the other spinules for the most part show 

 more or less reddish color. In T. alcocki the hinder margin of the 

 propodus of the fifth pair of legs is armed with 5 sharp spinules ; in 

 T. gardincri with 10. 



Color.- — Of the alcoholically preserved type : Granulations showing 

 through the pubescence of the carapace, and the crenulations of the 

 keels or ridges ornamenting it are reddish. 



The movable finger of the chelae is white-tipped, followed by a 

 brownish transverse band, then a white band of about the same width. 

 Neither band is as wide as the white portion of the tip, and both 

 together occupy about as much space as the reddish brown basal por- 

 tion of the finger. The middle third of the fixed ringer is brownish, 

 distal and proximal thirds white. 



The lateral spines of the carapace are red tipped and there is a fleck 

 of the same color near the base on the outer margin of each of the 

 lateral teeth except the fourth ; behind the corresponding fleck on the 

 fifth lateral spine there is a second spot of color farther down or pos- 

 terior to the first fleck, a little more removed from that fleck than it 

 is from the colored tip of the spine ; the tubercles and granules of the 

 chelipeds are also of a reddish color ; the spines arming the hands are 

 color-marked like the lateral spines. The ambulatory legs are dull 

 blackish brown barred ; there are two transverse bars of this dark 

 color on the dactyl, a very wide one around the middle of the propodus, 

 a similar one around the carpus, and two narrow ones about the merus. 



Remarks. — From the species of Thalamita that fall within the pur- 

 view of Alcock's group II.A (Journ. Asiatic Soc. Bengal, vol. 68, p. 

 73, 1899) ours is at once distinguished from T. investigatoris and im- 

 parimanus, and I believe also from T. tenuipes, by the fact that in 

 these species the hinder margin of the propodus of the last pair, or 



