120 
A nopheles Maculipennis 
invagination. Thej r are destined to form the gonapophyses or accessory 
copulatory organs of the imago. 
The following table shows the general conditions of the imaginal 
buds among the Diptera, and the relationships of the Culicidae in this 
respect to other forms. 
Imaginal buds of larval origin. 
A. Imaginal buds superficial in position being situated just below 
the hypodermis; the primitive invaginations remain permanently 
open. 
1. Anopheles ; Gulex (Miall and Hammond ex mss. Hurst). Head 
folds shallow, not extending into larval thorax. 
2. Corethra (Weismann); Simulium (Weismann, Yaney); Tanypus 
(Vaney). Intermediate between 1 and 3. 
3. Chironomus (Miall and Hammond); Ceratopogon (Miall and 
Hammond); Stratiomys (Vaney) ?; Cecidomyia (Marchal). Head folds 
extend into larval thorax. 
Imaginal buds for the most part of embryonic origin. 
B. Thoracic buds superficial in position, cephalic buds as in C. 
Melophagus (Pratt). Possess an additional pair of ventral cephalic 
buds not discovered in other Diptera. 
C. Imaginal buds deeply situated below hypodermis, only 
maintaining their connection with the latter by means of a thread-like 
pedicle. Cephalic buds situated in larval thorax. 
Muscids (Weismann); Anthomyia (Ganin); Volucella (Kunckel 
d’Herculais); Eristalis (Wahl); Gastrophilus (Vaney). 
The Eyes. 
In newly hatched larvae, and in larvae measuring up to 2 - 75—3'5mm. 
in length, a single oval deeply pigmented eye-spot is present on either 
side of the head. These larval eyes (“ Nebenaugen ”) are placed about 
half way between the neck and the bases of the antennae, and each has 
its long axis disposed transversely to the length of the head ( l.e. in 
Fig. 24 a and b). In larvae exceeding that length a second type of eye 
commences to develop, and is first noticeable in the form of a few small 
rounded pigmented patches situated above, and slightly behind, the 
larval eyes. These pigmented areas increase in number with the 
growth of the larva, and the newly added elements can be distinguished 
