211 



this species has the reniarkable habit of infesting especially the lower 

 and older leaves, usually their under sides. Ants which oi'Um attend 

 plaiit--lic(> foi- their sweetish excretions seem to pay no atUmtion to this 

 species. 



Fio. 221. The Yellow SorKhuin Vlnnt-Uniae, Chaitophorus flavus, winded female; a, antenna. 

 Greatly enlargeil. 



THE PRAIRIE WALKING-STICK. 



Diapheromera velii Walsh. 

 (7). veliei.) 



Gillette reports this sj)ecies* as abundant on two occasions in Col- 

 orado, once on corn and once on grass. It jirefers weedy open situa- 

 tions in rnark(>d contrast with the hal)its of D. jcmorata, which is a 

 forest species. We have found it connnon on open sandy ground in 



^HHI<'t»l?,'*l'll'l'"!'l|""''!'.'IH - 



Fig. 222. The Prairie Walking-stick, Diaph- Fin. 223. The Common Walking-stick, 



eromera velii: a, fore femur of female; b, tip Did iihcrorntni femoTuUi: ti, fore femur of 



of male abdomen; c, of female uhdomen. Much feiriale; 6, (ij) of male alxlomen; c, of female 



enlarged. ubilomen. Aluch enlarged. 



*Bull. 94, Col. Agr. Exper. Station, p. 22. 



