PKn(i;i;i)iX(is, l!r24 4-3 



Eriosoma lanigera illaiis.). The (Muninim wiMilly aphis uf ajjple. (Mirliiij;- 

 tlir leaves (if American elm, often continuin<r entirely on apple. 



Eriosoma lanuginosa (Hartig). The species oceurrino- on pear roots (py- 

 ricola) has recently been co-related to this species. A pear root 

 aphis occur on Vancouver Island and is probably this species. The 

 primary host is English elm, the leaves of wliieli it causes to form a 

 bag:-like pall. A European species. 



Eriosoma ulmi (L.). An intrmluced species altei-naliue' between Elielisli 

 elm and the routs of black currant and ^•(xtsebcrry. The root forms 

 were described as fodiens. 



PEMPHIGINI (Tribe) 



Pemphigus betae (Doane.j. Tiiis iieet -rout aphis o,ccurs in the Province 

 (111 mangels, beets, Rumex and PiilyiidiHiiiis, using the Cottonwood as 

 a winter host. The jiopiar form was described as balsamiferac 

 Williams. 



Pemphigus populicaulis (Fitch.). This species makes a petiole gall on 

 (■(ittdiiwcHid. and its secondary host was determined this year as 

 Oenanthe sarmentosa, Water Parsley (Umbelliferae). 



Pemphigus gravicornis (Patcli.). This species folds the leaves of cotton- 

 \vi)(id. Its alternate host is luiknown. 



Pemphigus populi-venae (Fitch). A gall like a cock's comb ascribed to 

 this species has been frequently observed mi cuttonwood at Agassiz ; 

 no alatae, however, were secured. It is believed that this species 

 also migrates to beet. 



PROCIPHILINI (Tribe) 



Prociphilus corrugatans (yirrinej. An aphid very near this species is 

 i'(piiiiuiinly f(.niid curling the leaves of the native Pyrus rivularis at 

 Agassiz. The fall migrants are taken abundantly on various species 

 of Pyrus and Crataegus. 



