Vol. 1.] 



Jones. — Catalogue of the Ephydridae. 



157 



face. Antenna rudimentary, with first lobe comparatively 

 long, second and third short. First segment back of the head 

 with a pair of fan-like spiracles or gills; the number of branches 

 varies from three in the young larva to seven in the adult, 

 directly connected with the anal siphon by the tracheal sys- 



FIG. 103. Larva of Ephydra iiiillbrx. 



tern; siphon tapering, semi-transparent. When feeding, the 

 larva draws the food in hy a process of invagination in which 

 the mouth parts are folded back into the head. The larva 

 resembles in some respects that of E. californica Pack., but 

 differs in the number of hooks on the abdominal tubercles and 



FIG. 104. Pupa of Ephydra iiiillbnK. 



in the form and size of the anal siphon and length of its acces- 

 sory branches. 



The puparium differs from that of E. halophila most notice- 

 ably in size, and from E. gracilis in the length of the anal 

 siphon, wliich is much longer in the latter species; it is also 

 much larger than E. gracilis. (Fig. 103.) 



Pupa. — Puparium brownish black; length, about 12 mm. 

 Seventh pair of legs small. Attached by last abdominal seg- 



