l6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 98 



their distal china-white tips were of this golden yellowish brown, the 

 palms showed an irregular pattern of color and the upper surfaces 

 of carpus and merus were likewise suffused with it, the color being 

 more concentrated and stronger on the merus than on the carpus. It 

 struck me as a bit unusual that burrowing shrimps such as these, so 

 often referred to as ghost shrimps, should show any particular color 

 markings at all other than very light shades of blues, pinks, or very 

 light flesh color. 



Petrolishes marginatum Stimpson 21 



Pachycheles biocellatus ( Lockington) 19 



THALAMITA ROOSEVELTI, n. sp. 2S 1$ 

 Fig. 2 



Holotype.—A male (U.S.N.M. no. 77787), the largest of three 

 specimens, measures 19.6 mm. in greatest width across the tips of the 



Fig. 2. — Thalamita rooscvclti, male. A, Dorsal view of carapace X 2; B, outer 

 face of right chela and carpus X2; C, basal joint of antennal X4! D, distal 

 segments of abdomen X 2. (The magnifications are approximate.) 



fifth pair of lateral spines marking the posterolateral angle of the 

 carapace, and 134 mm. long from the posterior margin to the anterior 

 border of the median lobes of the front. The movable fingers of 

 either chela are approximately of the same length, about 7 mm. each ; 

 the left hand a shade less than 5 mm. in dorsal length of palm, the 

 right one just about 5 mm. long. The left palm is also a little, but 

 not very noticeably, stouter than the right. 



The other two known specimens of the species are both immature, 

 a male and a female of approximately the same size and measuring 

 about 1 1.2 mm. in greatest width; the female is scarcely larger than 

 the male. 



Description. — Tlialamita rooscvclti is one of a group of three very 

 closely related species, which includes T. alcocki de Man (Abb. 

 Senckenb. Ges., vol. 25, p. 646, 1902) and T. gardineri Borradaile 

 (Fauna Maldive and Laccadive Archip., vol. 1, p. 205, fig. 36, 1902). 



