190 Aphiidae 



Eriosoma Leach 



E. lanigerum (Hausm.). Woolly Apple Aphid, or Elm Rosette Aphid. Widely 

 distributed throughout the State from St, Lawrence and Essex Counties south- 

 ward to Maspeth, LI. Apple, Crataegus, and elm, often injurious. 



E. rileyi (Thos.). Probably generally distributed throughout the State, but 

 recorded only from W^atertown and Northville (Felt). Elm. 



E. americanum Rly. Elm Leaf-Curl Aphid. Probably generally distributed 

 throughout the State, available records including from St. Lawrence and Essex 

 Counties southward to Westchester Co and Maspeth, L.I (Felt). Probably 

 blamable for the early summer curling of American elm leaves (Felt). 



E. ulmi (L.). The distribution of this species within the State is probably coincident 

 with that of E. americanum Rly., but E. ulmi is probably less common 

 (Baker & Mason) ; common on certain English elms (Patch). 



GOBAISHIA Matsumura 



G. ulmifuscus (Walsh). Reported from Warren, Ontario, Fulton, Greene, and 

 Westchester Counties, but is presumably widely distributed in the State 

 though rarely abundant (Felt). Produces a good-sized, somewhat irregular, 

 gall on leaves of slippery elm (Felt). 



Tetraneura Hartig 



T. graminis Mon. Albany, Sep (Felt), on heads of rice cut-grass, Leersia 

 (Homalocenchrus) orysoides] LI: Maspeth, on elm, Winfield, Je (01s). 



T. ulmisacculi Patch. Elm Sack Gall. Kenwood, May, HDHouse (Felt), gall 

 on Ulmus montana; LI: Roslyn, Maspeth, Je (Ols). 



Tribe PemPHIGINI 



MORDWILKOJA Del Guercio 



M. vagabundus Walsh. Reported from Monroe, Washington, Saratoga, and 

 Rensselaer Counties, and is probably rather generally and commonly present 

 in sections of the State where poplars grow (Felt). Produces a very ir- 

 regular, frequently massed, deformation of poplar leaves (Felt). 



Pemphigus Hartig 



P. popularius Fitch. Saranac Inn, Jl, gall on poplar. 



P. populicaulis Fitch. Ithaca, Albany, Je (Morr) ; LI: Mineola, Jl (Morr). 



P. populiglobuli Fitch. New Rochelle, Je, TJWade, gall on Lombardy poplar. 



P. populimonilis Rly. Alder Cr., Aug, gall on balm of Gilead. 



P. populitransversus Rly. Rochester, Je (Gill); Cambridge, Jl; Albany, Je. 



Galls on cottonwood. 

 P. lactucae Fitch (Tychea hrevicornis Hart, Rhisohius lactucae). A common 



lettuce root-louse, and probably rather generally distributed (Felt) ; Fredonia 



(Pergande). 



