100 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 8 



food plant as we have taken the sexuparse, the true sexual forms and 

 the eggs of this species on elm trees where colonies have been present 

 throughout the summer. 

 Schizoneura cratcegi Oestlund 



Like lanigera, this is a bark feeder and occurs upon the bark of both 

 the limbs and roots of native Cratcegus in Colorado. It also gives off 

 fall migrants which are much longer winged than lanigera and con- 

 sequently more nearly like americana of Riley, but we do not know 

 that its alternate host plant has been definitely determined. 

 Schizoneura lanigera Hausman 



This species inhabits the apple throughout the j^ear. During August 

 and September sexuparse migrate in large nurnbers from the apple, 

 but we have never been able to find these migrants establishing them- 

 selves upon other host plants, and we have never found return mi- 

 grants earlj^ in the summer coming to the apple. We are inclined to 

 the opinion that a regular alternate summer host for this species is 

 not positively known. We feel certain that sexuparae from the apple 

 do not migrate to the elm and produce either the elm leaf -curl gall, 

 Schizoneura americana of Riley, or the leaf-cluster gall or rosette of 

 the elm which was included hj Riley in his species americana, and 

 which we consider, for morphological and other reasons, to be a dis- 

 tinct species. We regret that, for Colorado at least, we cannot accept 

 the conclusions of Dr. Patch that Schizoneura lanigera upon the apple 

 has an>i;hing to do with the production of either the elm leaf-curl or 

 the elm leaf-cluster as described by Riley. A full discussion of this 

 matter would be too lengthy to incorporate here. 

 Anoecia corni Fabricius 



This species winters in the egg state in large numbers upon the stems 

 of dogwood, Svida stolonifera, in Colorado. The lice completely desert 

 the dogwood early in the summer and go to unknown plants. 

 Rhopalosiphum rhois Monell 



This louse is fairly common upon Rhus trilohata as a winter host in 

 Colorado. During the summer and fall months it occurs upon many 

 of the grasses where it seems to prefer the flower heads. We haA^e 

 taken it from timothy, wheat, oats, barley and native species of Ely- 

 mus. 



Amphorophora howardii Wilson 



This species was described in Canadian Entomologist for 1911, page 

 59, and was referred to under this name by Davis in Canadian 

 Entomologist for 1914, page 165. It seems to be a synonym of rhois. 

 Rhopalosiphum lactucce Kaltenbach 



This is a common species on Sonchus oleraceus during the summer 



