THREADWORMS, HAIRWORMS, BRISTLEWORMS 



lobed in the male, and tri-lobed in the female (Fig. no). 

 Their larvae have been found in two species of crickets. 

 The males of G. villoti are up to 26 inches long and the females 



Fig. no. — Adult or water stage of hairworms: 

 I, Paragordius varies, side view of head; 2, bi-lobed 

 tail of male; 3, tri-lobed tail of female; 4, Gordius 

 villoti, head of male; 5, tail of male. (Montgomery. 

 From Ward and Whipple.) 



are as long or longer. The tail is bluntly bi-lobed in the male 

 but blunt and single in the female (Fig. no). The larvas 

 live in various species of grasshoppers. 



Bristleworms — Oligochcsta 



Form and habits of bristleworms. — The fresh water bristle- 

 worms or oligoch^tes are either bristle-bearing worms about 

 half an inch long, or small aquatic earthworms easily recog- 

 nized as such. Their bodies are segmented and like the 

 leeches they belong to the great Phylum Annelida, which 

 contains all of the annulate or "ringed" worms. They 

 are built like earthworms and behave like them, overturning 



143 



