VOL. qB 
l6 SMITHSONIAN MISCELLANEOUS COLLECTIONS 
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. 
Pefrolishcs niarginatits Stimpson. . 21 
Pachychelcs hioccllaius (Lockington) 19 
THALAMITA ROOSEVELTI, n. sp. 2c? 
Fig. 2 
Holoiype . — A male (U.S.X'.M. no. 77787), the largest of three 
specimens, measures 19.6 mm. in greatest width across the tips of the 
Fig. 2 . — Thalaiiufa rooscz'clfi, male. A, Dorsal view of carapace X 2; 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 13.4 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 ])alm, 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 aj^iroximately the same size and measuring 
about 1 1.2 mm. in greatest width; the female is scarcely larger than 
the male. 
Description. — Thalamita rooscvelti 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 Maidive and Laccadive Archip., vol. i, p. 205, fig. 36, 1902). 
