382 THE CANADIAN ENTOMOLOGIST 



Genus Toxoptera. 



T. graminum Rond. possesses three or four large pores at the 

 base of the femur quite similar to those met with in the genus 

 Aphis. 



' Genus Rhopalosiphum . 



R. rhois Mon. possesses about six pores at the base of the 

 femur but these are considerably scattered (fig. 29). Another 

 species examined possesses four near the base (fig. 30). 



Genus Anoecia. 



Two species of this genus querci Fitch., and corni Fab. were 

 examined. Fall migrants were used in both cases. Both showed 

 about the same group of six to ten near the b^ase of the fore wing, 

 but the organs of the femur are difTerent. Querci Fitch shows a 

 row of four or five extending about oAe-quarter of the way along 

 the segment, whereas corni gave a group of six or seven near the 

 the base (Fig. 14). 



Genus Eriosoma. 



E. aniericannm Riley shows a group of three to nine pores at 

 the base of the fore wing (Fig. 17). These are surrounded by 

 irregularly shaped areas (Fig. 18). There are about three present, 

 usually at the base of the femur and usually three at the base of 

 the hind wing. E. pyricola B. & D., has a group somewhat larger 

 near the base of the fore wing (Fig. 19), and some four or five also 

 along the subcosta. 



Genus ProciphUns. 



Several species of this genus were studied and they proved 

 to be all quite similar as far as these organs are concerned. P. 

 humiilcB Sch., possesses a group of about 18 pores at the base of 

 the hind wing (Fig. 9) and a few scattered along the subcosta of 

 the fore wing. The base of the femur has another group of about 

 eight pores (Fig. 10). P. pyri Fitch is very similar to bumulce 

 as far as the wings are concerned, there being a group of about 

 15 at the base of the hind wing. The group on the femur is a 

 little more scattered in pyri (Fig. 11) and several are seen on the 

 trochanter. P. imhricator Fitch has a group of about fifteen at 

 the base of the hind wing (Fig. 12), and a scattered group of about 

 six on the proximal end of the femur. There are also two or 

 three near the base of the fore wing. 



