£40 Records of the Indian Museum. [Vor: Xie 
this generalized type is approached more closely by young than 
by old larvae. Only in Leptaulax bicolor is the reverse the case, 
and here only as regards the small dorsal thoracic hairs which do 
not develop at all in L. bicolor var. vicinus. 
Passalid pupae all appear to resemble in general form that of 
‘* Passalus’’ cornutus figured by Riley (loc. cit.), differing mainly in 
the structure of the head, which reveals more or less distinctly the 
characteristic features of the head of the developing beetle. They 
will not be further described here. 
Pleurarius brachyphyllus, Stoliczka. 
(Pl. xx, figs: 1-3.) 
Localities.—Cochin State: t1oth-14th mile of State Forest 
Tramway. ca. 0-300 ft; Kavalai, ca. 1300-3000 
Et: 
Larvae of this species are remarkable for the change which 
takes place in the structure of their hairs when the insects are 
about 25 mm. long. In young larvae these hairs are all long, 
tapering and filiform as in other species. In old ones only those 
on the head (missing in all our full grown specimens, but present 
in a number somewhat more than 25 mm. long), the ventral pair 
on the ninth abdominal segment, and the circumanal ring on the 
tenth retain this form, the rest being short, stout and clavate. 
Full grown larvae may be at least 50 mm. in length. In the 
Indian Museum collection there are several of about this size, and 
a large number of from about 14-30 mm. long. Unfortunately 
there are none between 30 and 50 mm. 
The head would apparently be covered all over with fine hair 
was it not worn down to the roots in places—e.g., on the dorsal 
sutrface—till only the points of origin remain. Two long hairs are 
present behind the antennae. Of these the dorsal is the stouter and 
may be more or less ribbon-like. Three hairs are present in the 
anterior angles of the first thoracic segment of larvae not old 
enough to have developed clavate hairs. In others, on this as on 
other segments up to the second abdominal, only the single lateral 
pair of hairs is present. A single pair of dorsal hairs is present 
in addition on the next seven segments. On the last of these 
(the ninth abdominal) the ventral pair is also present. The tenth 
abdominal segment bears the usual circumanal ring of hairs. 
. In larvae which are not old enough to have developed cla- 
vate hairs the general surface of the body is smooth, apart from 
scattered specks which appear to represent sparse and undevel- 
oped pile. In older larvae there are tufts of pile above each leg, 
one in front and one behind, and tufts on the lateral margins of 
each tergum. The tergal tufts are united by dorsal bands on the 
first and second thoracic segments, and on the posterior border of 
the ninth and the whole of the tenth abdominal segments. 
