374 



Mr. F. W. Edwards on the 



Fi-. 1. 



Aedes geniculatus (Olivier). 



Dorsal view of head of first-stage larva, to show position and form of 

 egg-burster : from a living specimen. X about 60. (The shading is 

 intended to represent fine ridges in the chitin, -svhich occur over the 

 greater part of the head.) 



Fio;. 2 a. 



Fig. 2. 



Fig. 2. — Aedes an/enfeus (Poiret) {^Stegomyia fasciata auct.]. Egg- 

 burster, seen from posterior end of head, showing thickness of disc 

 and strong central peg. x about 100. 



Fig. 2 a. — The same, half side view. From cast skins; diagrammatic. 



Fig. 3. 



Theohaldia annulata (Schrank). 



Sectional view (transverse) through egg-burster, showing attachment of 

 muscles. X about 120. From a balsam mount in the British 

 Museum, prepared by Mr. W. D. Lang. 



