126 
Anopheles Maculipennis 
is difficult to separate them. The larva of A. smithii Coq. differs, 
however, so greatly from that of A. fuscus that the systematist if he 
were relying solely on larval characters would unhesitatingly place it in 
a separate genus. According to Dyar (1901, p. 178) it possesses but 
a single pair of anal gills which are broad and rounded at their apices ; 
in the number of its gills it seems to be unique among Culicid larvae 
and Dyar and Knab regal’d the upper pair as having been aborted. 
The mandibles have but a single bristle or curved spine at the apex 
and furthermore the pecten is entirely wanting. From A. fuscus it 
further differs in the form of the thorax and siphon. 
In Uranotaenia the larva closely resembles that of a typical Culex 
but the comb is remarkable in that it consists of eight simple spine-like 
processes attached to the posterior margin of a lateral plate of chitin, 
and recalls the comb plate of the Anophelinae (Dyar, 1901, p. 179; 
Felt, 1901, p. 343). The larva of Deinocerites is only known from very 
brief notes given by Theobald (1903, vol. iii., p. 280) and it is not 
possible to compare it with other forms. His account is also rather 
obscure, since he confuses the thorax partly with the first two 
abdominal segments. 
The Heptaphlebomyinae include but a single genus whose larva is 
unknown. 
In the Curethrinae the larval stages are known for all the described 
genera. That of Sayomyia 1 represents the extreme type of larval 
development met with in this sub-family. It is almost perfectly 
transparent, the extremities of the jaws and the pigmented eyes and 
air reservoirs being the only parts that catch the unaided eye. The 
fore part of the head is much prolonged, carrying the antennae at the 
extremity. The pharynx is modified into an eversible tube, and there 
are remarkable posterior hooks carried on the last abdominal segment. 
Respiration appears to be almost entirely cutaneous, though a greatly 
reduced and much modified tracheal system is present. It consists of 
a pair of longitudinal trunks extending through the greater part of the 
animal, but does not contain air, except in the thorax and the seventh 
abdominal segment. In these positions, however, there are situated a 
pair of pigmented air reservoirs. There are no traces of spiracles 
present. Situated on the ninth segment of the abdomen are two pairs 
of anal gills. 
The larva of Corethra 2 forms a connecting link between that of 
1 Sayomyia Coquill. (Corethra Loew). 
- Corethra Meigen (Mochlonynx Loew). 
