98 IOWA ACADEMY OF SCIENCES. 



NOTES ON APHIDID^ 



HERBERT OSBORN AND F. A. SIRRINE. 



A list of the Aphidid?e of the State as far as collected was published in the pro- 

 ceedings of this Academy for 1890-91 as part of the catalogue of Iowa Hemiptera. 

 It was known at the time to be very incomplete, but it was considered best to 

 include only such species as had been actually observed. As the past season 

 was favorable, especially during aufumn, for collecting in this family, considerable 

 more material has been added. We present, therefore, a supplemental list with 

 notes on habits and references to host plants. 



Siphonophora erigeronensis Thos. On Erigeron canadensis. (Common "Horse 

 Weed.") This is one of the most common species, occurring on a number of 

 common weeds besides the above, and also on greenhouse plants. 



Siphonophora sp. Apparently identical with S. Geranii Oestl. On leaves of 

 Ostrya virginica (Hop Hornbeam). 



Siphonophora tilise Monell. On Tilia americana (Basswood). 



Siphonophora granaria Kby. On volunteer oats and has been abundant in 

 different parts of the State. Was overlooked in making up the previous list. 



Siphonophora sp. On Trifolium pratense (Red Clover). 



Siphonophora sp. On Scrophularia nodosa. 



Siphonophora sp. On Cicuta maculata (Poison Hemlock). 



Siphonophora sp. On Polygonum Hartwrightii. 



Phorodon humuli Schrank, on Hop. Collected on Des Moines river in Boone 

 county, and on Squaw creek in Story county. 



Phorodon sp. On Monarda punctata (Horse Mint). This species is probably 

 identical with the Phorodon which Mr. T. A. Williams lists without description 

 as Phorodon monardse n. sp. on Monarda fistulosa. 



Siphocoryne xanthii Oestland. On Xnathium canadense (Cocklebur). This 

 pretty species was quite abundant on the above plant daring the latter part of the 

 summer. 



Rhopalosiphum nymphaese L. On Nymphfea odorata (Pond Lily). What is 

 apparently the same species occurred also on the Arrow leaf Sagittaria variabilis. 



Rhopalosiphum rhois Monell. (?) On Rhus glabra (Sumach). 



Rhopalosiphum serotina3 Oestl. (?) On apple leaves. 



Aphis maidis fitch. Abundant on corn, Broom corn and Sorghum. Given in 

 previous list but not from this locality. 



