COLLECTING AND l'KKSKKVING INSECTS BANKS. 



20 



wings are not slender. The black flies and buffalo gnats (Simuliidae) 

 belong to this group. They can bite very severely. Their larvae 

 occur in streams, and have long brushes near the head, and their pupae 

 have long filaments 

 from the thorax. 



The suborder Bka- 

 CHYCERA is divisible 

 into four sections : 



(1) The Orihorrha- 

 pha, which do not 

 have a coarctate 

 pupa. The larvas 

 have a distinct head, 

 and the last joint of 

 the antenna is often 

 long and sometimes 

 shows ambulations, 

 and there is no fron- 

 tal lunule or suture 

 over the base of the 

 antenna?. This sec- 

 tion includes our 



lai^CSt nies. ine\ FlG. 57.— THE YELLOW-FEVER MOSQUITO, STEGOMYIA CALOPUS. 



are arranged in three 



groups: (a) The Eremochaeta, which have the median projection, 



called an empodium, between the pads or pulvilli on the feet similar 



Fig. 58.— A Bombylhd FLY, Spogostylum simson 



in appearance to the pulvilli, and the third joint of the antenna? 

 often shows annulations. There are no large bristles on the body, 



