TQT5.} F. H. GRAVELY: Beetles from Cochin. 363 
Specimens of the slender type are represented from the 
following localities :— 
Malay Peninsula: Johore. 
Sinkep Island (near Sumatra). 
I have examined the mouthparts of one specimen of the 
latter type from Johore, and of one of the specimens of the 
former type from Lankawi and of those from Ceylon. They are 
all constructed on the same plan, but are apt to be less slender 
than inthe larva of Lyropaeus biguttatus.} 
It is difficult to see how these creatures can feed. The man- 
dibles are presumably used to pump juices along the grooved 
maxillae in much the same way as the maxillae are used to pump 
juices along the grooved mandibles of Hemerobiid larvae. But 
‘“Trilobite Iarvae’’ seem to have no means of grasping prey. 
Presumably therefore they must eat something which they need 
not grasp securely, such as snails or planarians. Dr. Annandale 
tells me that he found these ‘‘larvae’’ in great abundance in 
the Malay Peninsula. He noticed that the broad and slender 
types always occurred together, which led him to think that 
the difference might conceivably be sexual*®; and that they were 
only found where planarians were plentiful and snails scarce. It 
seems not unlikely, therefore, that they feed on planarians. It 
is also possible that they may feed on the juices of decaying 
wood, etc., which might account for the long periods of time 
during which they have been known to live without being known 
to feed (Gahan, 1913, p. 62). 
Trilobite larvae are known in some instances at least to be 
luminous. This was first recorded by Kolbe (loc. cit.) on very 
uncertain authority, but Shelford (loc. cit.) has since noticed that 
one species has a pair of phosphoresecent organs on the penulti- 
mate segment of the abdomen. 
III. Tenebrionidae—Catapiestus indicus, Fairmaire. 
(Plate xxi, figs. 20-25). 
Fairmaire described this species (Ann. Soc. Ent. Belge. XL, 
1896, p. 28) from specimens collected in Kanara, and noted that it 
occurred in ‘‘ Sikkim” also. It appears to have a wide distribu- 
tion extending from the Western Ghats of Southern India to the 
Abor country and Lower Burma (for details see Tenebrionidae 
of the Abor Expedition, Rec. Ind. Mus. VIII). 
The specimens described below were taken with adults from 
under the bark of a fallen log. A cast larval skin was found close 
behind the pupa. 
! Other authors refer to the maxillary and labial palps as four and three- 
jointed respectively, instead of as three and two-jointed as they appear to me to 
be both in cleared cast-skins and potashed specimens. _ 
2 The slender type does not seem to occur in the Indian Peninsula or Ceylon ; 
but this may mean that it is only in the Malay Region, where ‘' Trilobite Larvae ”’ 
appear to reach their highest development, that larviform males occur. 
