12 
describes curious quadrangular frontal processes, but these appear to be the 
widely opened maxilla. The bodies he describes as antennz are apparently 
the maxillary palps. The siphon tube is very short and, from Theobald’s drawing, 
appears very unlike that of other larve. 
Cannibal larve.—James*‘ was the first to describe a species (C. concolor) 
in which the larve possessed cannibal habits. Theobald notes that the related 
species C. tigrzpes is also cannibal. The larve of Megarhinus and Toxorhyn- 
chites have been described by Theobald, and from the structure of their mouth 
parts, are obviously also cannibal species. Zutzia and Psorophora, according to 
Lutz,? are actively cannibal. I have lately found the larva of Mucidus 
scataphagoides to be cannibal and to possess the modified mouth parts which 
appear to be characteristic of all these species. The following genera may be 
noted as containing, and possibly consisting entirely of species having larve of 
cannibal habits :— 
Megarhinus. 
Toxorhynchites. 
Muctdus. 
Psorophora. 
Lutzia. 
C. concolor. 
Famesia C. tigripes. 
(new genus). 
In all cases in which the habits have been described in detail the larve are 
characterised by their extreme voracity and their habit of preying solely upon 
other mosquito larve. Although the species observed by us (C. concolor and 
M. scataphagotdes) were seen to swallow small water-crustacea (Daphnia), yet 
in the main they fed upon other larve. In both cases the larve lay horizontally, 
quite motionless, with the modified brushes widely extended. When another larva 
approached within a certain distance it was suddenly seized, no matter its size 
or how vigorously it struggled. Small larvze were often swallowed whole. Larger 
specimens were devoured except the head-case and siphon tube. When food was 
abundant, these larve increased in size with remarkable rapidity and ultimately 
became conspicuous as giant larve. In Mian Mir both C. concolor and M. 
scataphagoides were exceedingly common and were found wherever other Culex 
larvee abounded. The larve of M. scataphagoides occurred in pools with much 
vegetation. C. concolor, on the other hand, was found together with C. fatigans 
in pots, small dirty puddles, etc. In Mian Mir, and probably elsewhere, cannibal 
species must play an important role in the reduction of the numbers of mosqui- 
toes. From the examination of the two species already mentioned and from 
Theobald’s drawings of Megarhinus, Toxorhynchztes, and C. tigripes, it is 
