118 Messrs. O. Tiomas and H. C. Robinson on 
near the caudal margin; tergites three to five dull orange; 
six and seven black; eight and nine orange; sternites 
orange, segments six and seven and tie basal half of eight 
black. Male hypopygium with the ninth tergite about as 
in N. unicingulata, but the lateral angles not so pronounced ; 
eighth sternite notched medially, fringed on either side with 
conspicuous yellow hairs. 
Hab. Natal. 
Holotype, 3 , Ulundi, altitude 5000-6500 feet, September 
1896 (G. A. K. Marshall). B.M. no. 1908. 17. 
Type in the collection of the British Museum (Natural 
History). 
Nephrotoma marshalli agrees with N. crocea (Loew) in 
its bifid frontal tubercle, but differs in the short antenne, 
the differently shaped occipital mark, and the details of 
coloration. It agrees well with N. wnicingulata, Alexander, 
in the coloration of the abdomen and the macrotrichiz of 
the wing, but differs in the structure of the frontal tubercle 
and the details of coloration and structure. This interesting 
erane-fly is respectfully dedicated to its collector, Dr. Guy 
A. K. Marshall. 
VIIT.—Some new Insular Squirrels of the Callosciurus 
caniceps-concolor Group from Peninsular Siam. By 
OLPFIELD THOMAS and HERBERT C. ROBINSON. 
(Published by permission of the Trustees of the British Museum.) 
Tne following new forms of Squirrel come from various 
small islands off the west coast of Peninsular Siam, between 
9° and 6° N. latitude, the majority being from islets near 
Salanga (=Junk-Ceylon), 8° N 
In describing them we are confronted. with the difficulties 
every one has met in dealing with plastic island forms of 
various degrees of specialization, and the question’as to what 
forms should have binomial and what trinomial ‘is one that 
we have had great hesitation in deciding. 
On the whole, in this group, we have come to the dondligian 
that the relationships of the different forms willbe most 
easily understood if they are attached to what appear to be 
their parent continental species, and that of these it is advis- 
able to recognize three, namely :— . 
C- caniceps, from north of about 13°, with yellow poaonally 
