92 



The Fly of Chironomits 



Antennae. 



rounded prominence behind tlie insertion of eacli antenna. 



These he regards as the functionless representatives of 



the ocelli of other Dipterous families. The Culicidae, 



Chironomidae, Psychodidae, 



Tipulidae, like the Simulidae 



and most Cecidomyidae, have 



as a rule no ocelli. Schiner 



has however found traces of 



ocelli in some Chironomidae, 



especially Tanypus. Osten 



Sacken ^ notes that Trichocera 



has distinct ocelli, and he 



thinks that Pedicia has some- 



thino; like them. 



The antennae differ ma- 

 terially in the two sexes 

 (fig. 64). In the male each 

 consists of thirteen joints, most of which appear at first 



Fig. 63. — Section through pro- 

 cesses on vertex of fly, showing 

 nerve-pedicel connecting them 

 with the brain. From pupa.. 

 X 300. Cf. fig. 140. 



Fig. 64. — I, antenna of male fly. 

 3, antenna of female fly. x 20. 



2, section through shaft of ditto. 



sight to be simple cylinders. On closer examination 

 it is found that the shaft, composed of the last ten 



' 1887, p. 169; 1892, pp. 460 r. 



