4 
both of which localities A. Sinensis, Wied., has been received, 
but I believe it occurs in all the intervening East Indian Islands. 
This species is synonymous with Van der Wulp's A. barbirostris 
from East Java and Walker's A. vanus from the Celebes. 
A long series sent by Mr. Wray from the Straits Settle- 
ments show great variation both in colour and size ; whereas 
all the other Anopheles appear very constant in colour and 
markings. 
At present I am engaged with the genus Culex, some ninety 
odd species of which have already been identified or described as 
new species. The work of identification is extremely difficult 
owing to the very meagre descriptions of most of the older 
species. In many cases one description will apply to two or 
three distinct species, so that the probability is that several 
described as new species have been previously named, but cannot 
be identified unless from the original types, many of which have 
decayed away. Again a large number of descriptions have been 
compiled from worn specimens and are thus valueless ; in this 
way, I believe, Walker described Culex taeniatus under at least 
three different names ( C. zonatipes, C. formosus, and C. exagitans). 
In three authors alone are the descriptions sufficiently full and 
clear to be of any value, namely Skuse's of the Australasian 
species, Arribalzaga's of the Argentine, aud Ficalbi's of 
the Italian and European, and a few isolated species such as 
those described by Coquillet, Williston, and others in various 
journals. 
So far no purely European species except those that occur in 
Malta and Gibraltar, etc., have been examined by me, as the 
majority of the collections have come from tropical and sub- 
tropical countries. 
Two species of Culex seem to have a very wide distribution, 
namely, C. taeniatus (Meig) and C.fatigans Wied. The former I 
make synonymous with the following, C. formosus, C. exagitans, 
and G, zonatipes of Walker, C. Rossi? of Giles, and C. elegant, 
Ficalbi, whilst C. mosquito of Kobineau Desvoidy is undoubtedly 
;i distinct variety of < . taeniatus, specimens of typical C. mosquito 
merging into those of C. taeniatus. This species has been sent 
