8o 
ZOOLOGY OF THE FAR EAST. 
As Carpenter' considers the "horns" of the 8th abdominal segment in the 
males of Halohates to be of specific importance, an out- 
line drawing of the ventral apical segments of one of 
the specimens in alcohol is here reproduced. 
It will be seen that the " horns" are symmetrical as 
is the case in H. fiaviventris , Esch., but the " process" 
on the outer margin, near the middle of each is bluntly 
produced and the ' ' horns ' ' overlap the egg-shaped gth 
Fig. 2.—Halobates sexualis. abdominal segment a little before their apices, which 
\'entral view of male genitalia. x22i. , • . j 
are acutely pomted. 
Fam. NEPIDAE. 
Laccotrephes ruber (Linn.). 
IQ06. Laccotrephes niher. Distant, W. L., Fauna of British India, Rhynchota, III, p. 18. 
One specimen from a small pool or ditch at the edge of the lake, Tale vSap, 
Patalung, i4-i-i6. Compared with Indian specimens identified by Distant. 
Laccotrephes griseus (Guer.). 
1910. Laccotrephes griseus. Distant, W. L., Fauna of British India, Rhynchota, V (Appen- 
dix), p. 314. 
One specimen from a small creek at Pok Raw, Tale Sap, i8-i-i6. Compared 
with Indian specimens identified by Distant. 
Ranatra fiiiformis, Fabr. 
1906. Ranatra fiiiformis. Distant, W. L,., Fauna of British India, Rhynchota, III, p. 21. 
Six specimens from a small pool or ditch at the edge of the lake, Tale Sap, Pata- 
lung, i3-i-i6. Compared with Indian specimens identified by Distant. 
Cercotmctus compositus, Montd. 
1903. Cercotmctus compositus, Montandon, A. L,., Bull. Soc. Sci. Bucarest, XII, p. log. 
Two specimens. One from a small pool or ditch at the edge of the lake, Tale 
Sap, Patalung, i3-i-i6, another from Koh Si Hah, Tale Sap, Singgora Province. 
I have not been able to compare these specimens with the original description 
of this species, but on reading Montandon 's discussion on the described species of 
Cercotmetus on p. 63 of Ann. Hist.-Nat. Mus. Nat. Hung. (Budapest, 1909) VII, I 
have no doubt about their identity. 
At the time they were collected both specimens were placed in alcohol. Lately 
I removed one, pinned it and while still wet immersed it in crude benzine where it 
was allowed to remain till the benzine ceased to be turbid, by which I concluded that 
all the alcohol had been drawn out of the insect. I then removed it and immediately 
Carpenter, G. H., Ceylon Pearl Fisheyies, V, plate, figs. 5-7 (1906). 
