CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 349 



25 days; 3^^ inch long with orange-yellow dry body and light colored 

 head; enters the ground for a week where it forms a cell. 



Pupa. — Formed in a cell in the ground, 1-2 inches below surface; 

 duration i week. Pupae of last brood hibernate, but some larvae 

 do not pupate until spring. 



Parasite. — Pentarthron minutum. 



Control. — Readily controlled by arsenicals or tobacco-soap solu- 

 tions, or by dry hellebore or air-slaked lime. 



Fig. 232. 



-Western wheat-stem saw-fly (Cephus occidentalis) : c, adult. 

 Criddle, Ent. Bui. 11, Dept. Agric. Ottawa.) 



{After 



Rose-slugs. — Three species infest the rose, the American Rose- 

 slug {Endelomyia cethiops Fab.), the Bristly Rose- worm {Cladius 

 pectinicornis Fourcr) and the Curled Rose-worm {Emphytus cinctipes 

 Nort.). They vary from J^-^^ inch in length. 



Western Wheat-stem Saw-fly {Cephus occidentalis R. and M.). — 

 (Consult Ent. Bull. 11, Dep. Agric, Ottawa.) A native of N, America, 



