IOWA acadp:my of sciences. 129 



AVHIDID.K. 



Siphonojthora rudbeckia' Fitch. A couiinoii species ou Rudbeckia? and a 

 number of other compositiv. 



Siplionophora ambrosuv Thos. Reported from Sioux City by Dr. Cyrus 

 Thomas, Third Rept. 111. Ins. p. 50. 



Siphonophora asclepiadis Fitch. A species common on milkweed is quite 

 surely this species. 



Myzus ceraai Fab, "Very common on cherry. 



Myzus pcrsicce Abundant on wild plum. 



Myzus ribi.t Linn. Common on currant, producing curled and highly 

 colored leaves. 



Drepanoftipimm acerifolice. Thos. Common on Soft maple and a vei'y 

 similar form has been taken on the sycamore. 



Aphis mnli Fab. Common on apple. 



Aphis pruniYioch.. [I) I cannot say with certainty that this species has 

 been observed though common plum plant lice would seem to belong here. 



Aphis pnmifolice Fitch. Common on plum. 



Aphis rumicis Linn. Ou Wahoo, Pigweed, Shepherds Purse, and is 

 recorded by authors as occuring on a variety of other plants in other states 

 and Avill doubtless be found the same here. 



Aphis maidis Fitch. Reported to me as occurring on corn. 



Aphis b7-assicceL\un . Very common on cabbage. 



Aphis viburni Schr. On Snowball. 



Aphis carduella Walsh. Common on thistle. 



Aphis medicaginis Koch. ? Rare ou clover. 



Aphis cornifolia' Fitch. Common on Cornus. 



Monellia carydla Fitch. Collected once on hickor}- at Ames. 



Chaitophorus nexjundinis Thos. Common on box elder. 



Myzocallis ("?) sp. A species apparently undescribed observed in abund- 

 ance on wild i*ye, Elymus canadensis. 



Callipierus sp. Collected from clover. 



CaUipterus {'i) sp. Has been collected by Mr. F. A. Sirrine on Quaking 

 Asp Populus tremnloides. 



MelanoxanVms salicis Linn. Common on poplar and willow. It'has 

 been determined by Mr. F. A. Sirrine to migrate in fall from willow to 

 poplar to deposit winter eggs, and the second agamic brood in spring to 

 acquire wings and return to willow. 



Lachnus salicicola Uhl. (?) Abundant on willow. 



Lachnus dentatus LeBaron. Abundant on willow. 



Lachnus longistigma Monell. Occurs on European basswood. 



Schizoneura lanigera Hauss. No specimens of this species have been 

 collected here, but specimens of what is very evidently its work have been 

 sent me from various parts of the State. 



Schizoneura crata;gi Oest. Very plentiful on Thorn trees. 



Schizoneura americana Riley. Common on elm, curling the leaves. 



Schizoneura corni Fab. "V ery common ou Cornus and is considered as 

 identical with the S. panicola of Thomas, which occurs during summer 

 and early autumn on grass roots. 



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