46 PROCEEDINGS OF THE NATIONAL MUSEUM VOL, 125 
mite rather than subparallel; (3) there is a dark patch of chromato- 
phores on both the second and fifth abdominal somites; and (4) there 
are many less tubercles on the telson (in O. massavensis there are two 
rows of erect tubercles flanking the median carina, one row on each 
side of the convergent lines of pits; in O. hesperia, only the inner 
of these two rows is well developed; the tubercles on the anterior 
half of the lateral surface of the telson, which are present in 
O. massavensis, are rarely developed in O. hesperia). 
The two dark dorsal patches on the abdomen are not visible on 
the type; they are not always visible on the specimens from Karachi 
reported herein. 
Both O. hesperia and O. massavensis resemble O. woodmasoni (Kemp) 
in several features, but both of the former species can be distinguished 
from O. woodmasoni by the presence of dorsal tubercles on the telson 
and by the well-developed lobe on the inner spine of the basal pro- 
longation of the uropod. All three species have a smooth, polished 
carapace, lacking a well-developed anterior bifurcation on the median 
carina, and in all three the anterior width of the carapace is greater 
than half the median length of the carapace. 
Small specimens of O. hesperia have a sharp spine instead of a 
rounded lobe on the inner spine of the basal prolongation of the 
uropod; in adults the lobe is rounded and may be very inconspicu- 
ous. The lobe is illustrated in figures 17c-e for three specimens, TL 52, 
92, and 101 mm. 
In adult males (TL 75 mm or more) the margin of the telson is 
noticeably more inflated than in the females. The denticles and 
carinae of the teeth may all be affected by the enlargement. 
Oratosquilla hesperia is the most abundant stomatopod in the 
fishing grounds off Karachi. 
DIstTRIBUTION.—Western Indian Ocean, from Muscat, Aden, West 
Pakistan, Zanzibar, and Madagascar. 
Literature Cited 
Baie, M. M. 
1954. Species of Stomatopoda of Karachi coast. Proc. 6th Pakistan Sci. 
Conf., vol. 3, pp. 143-144. 
Batss, H. 
1938. Stomatopoda. Jn Bronn, Klassen und Ordnungen des Tierreichs, 
vol. 5, sec. 1, book 6, pt. 2, pp. 1-178, figs. 1-114. 
BARNARD, K. H. 
1950. Descriptive list of South African stomatopod Crustacea (mantis 
shrimps). Ann. South African Mus., vol. 38, pp. 838-864, figs. 
1-4. 
1962. New records of marine Crustacea from the East Africa region. Crus- 
taceana, vol. 3, no. 3, pp. 239-245, figs. 1-3. 
