the Larva of Anopheles maculipennis, Meigen. 295 
easy to discover. They are superficial in position, being situated 
just below the hypodermis, and the primitive invaginations of the 
buds remain permanently open. 
The antennal buds are the largest of the cephalic buds and 
are placed at the bases of the larval antennae, but are in no way 
enclosed by the latter. The buds of the future labrum, labium 
and maxillary palpi alone attain the condition of imaginal folds 
prior to pupation ; those of the mandibles and maxillae remain in 
the condition of simple hypodermic thickenings. In the thorax 
three successive pairs of buds are present on either side, belonging 
to the pro-, meso-, and meta-thorax respectively and disposed in 
a dorsal and ventral series. The ventral row give rise to the 
three pairs of legs, while of the dorsal series, the first pair form 
the pupal respiratory siphons, the second pair the future wings 
and the third pair the halteres. 
The imaginal buds of the abdomen consist of a dorsal and 
ventral pair situated on either side near the hinder extremit}^ 
of the body. The dorsal pair of buds form the pupal tail fins, 
they are placed one on either side of the eighth abdominal 
segment and lie within the supporting skeleton of the larval 
spiracles. The second pair of buds are ventral in position and 
are destined to form the gonopophyses or accessory copulatory 
organs of the imago. 
The remainder of the paper dealt with the general structure 
of the larvse of the various genera of the Culicidse together with 
remarks on their mutual affinities. 
The first part of the paper has been published in the Journal 
of Hygiene, Vol. vil. No. 2, April, 1907, and the remainder is in 
course of publication in that same periodical. 
