A. D. Imms 
125 
The anal gills are either reduced to mere stumps or are completely 
absent, and the attitude of these larvae in relation to the surface film 
is much more horizontal than is usual among larvae of the Culieinae. 
The two species, G. concolor and G. tigripes, Christophers proposes to 
place in a new genus Jamesia, and provided the larval characters are 
corroborated by sufficiently important differences in the imago, this 
procedure is fully warranted. Furthermore, the remarkable larva of 
G. mimeticus suggests the possibility that a new genus may be 
desirable in this instance also. 
It seems highly probable that, as our knowledge of the Culicidae 
becomes more extended, a rational classification of the family will have 
to be based on a combination of both larval and imaginal characters, 
and in no other family of Diptera do the larvae apparently exhibit such 
exceptionally well-defined features, among both genera and species, for 
this purpose. At present however, until the morphology and ethology 
of the larvae have been more critically studied and how far any 
particular modification may be correlated with a certain mode of life, it 
seems very nearly impossible to discriminate between those characters 
which have been developed, perhaps recently, by adaptation and those 
which are to be regarded as phylogenetic or morphological characters. 
Until this distinction is clearly recognised the application of larval 
characters for the purposes of classification loses much of its value. 
Dyar and Knab (1906) have recently contributed an important paper 
in which they classify the larvae of the New World mosquitoes 
independently of the imagines. It remains to be seen, however, how 
far this scheme will fit in with any system of classification founded 
on imaginal characters. 
Of the Joblotinae our knowledge of the larval stage is based on a 
very brief description given by Theobald (1903, vol. iii. p. 334) of the 
young larva of Joblotia niveipes and the later account of Goeldi 
(1905, p. 120). It appears to be an extremely divergent form with 
stout blunt antennae and a pair of remarkable “ frontal processes.” 
The latter, however, seem to be really the maxillae. There is a short 
respiratory siphon of very unusual form, but there seem to be no 
lateral comb. 
In the Aedomyinae the larval stages are very little known. In 
Aedes fuscus Osten-Sac. the larva is of the general Cidex type and 
possesses four narrow lanceolate gills and a very short siphon 
(Dyar, 1902, p. 197). According to Felt (1904, p. 340) it so nearly 
resembles the larvae of G. Sylvestris Thed. and G. impiger Walk, that it 
