IOWA ACADEMY OF SCIENCES. 129 



Mesoleptus sp. 



Tryphon four, imdetermiQed sp. 



Polyblastes sp. 



Bassus two, undetermined sp. 



Bassus sychophanta Walsh. 



Coleoceutrus sp. 



Ephialtes sp. 



Theronia sp. 



Pimpla teuuicornis Cress. 



Pimpla inquisitor Say. 



Polysphinctasp. 



Glypta tuberculifrous Cress. 



Glypta rufiscutellaris Cress. 



Arenetra ventralis Cress. 



Larupronota rutipes Cress. 



Xjlonomus stigmapterus Say. 



Xylonomus albopictus Cress. 



A NEW SPECIES OF PEMPHIGUS OCCURRING ON THORN. 



BY F. A.TWOOD SIRRINE. 



CEstlund', in describing ttie characters and work of Aphis crataegifolice 

 Fitch, says: " Found on leaves of Crafaegrjis corrugating them. Specimens 

 taken during May on Crataegus tomeiitosa Linn, were found to curl the 

 leaves very much, and as they turned dark brown or red they became very 

 conspicuous." v 



The past season what Avas taken to be the fundatx'ix of a Schizoneura, 

 possibly crataegi, was found May 23d corrugating the leaves of Crataegus 

 tomentosa (?) and at the same time causing them to turn a bright red or 

 scarlet color. The fondatrici of what was supposed to be Aphis crataegifoliae 

 were found at the same time and on the same plants, curling the leaves but 

 not to such an extent as the supposed Schizoneura, nor did they cause the 

 leaves to change color. 



Later in the season as Aphis crataegifoliae increased in numbers they 

 were found in the colored corrugated leaves with the Schizojieura'7 On June 

 26th winged specimens of the latter were obtained. The venation of the 

 Aviugs proved that they were Pemphigus and not Schizoueura. By the 10th 

 of July these had all left the Hawthorn. On October 7th, dead, shriveled 

 specimens of Pemphigus were found under the rough bark of Hawthorn 

 (Crataegus tomeiitosa Linn.) which agreed in venation with the form taken 

 in the curled leaves in the spring; an oviparous female was also taken, 

 though the latter may have been an oviparous female of Schizoneura, as both 



iSynop. Aphididae of Minn. (Bull. No. 4, Geol. and Nat. Hist. Surv. Minn. p. 51.) 



