100 IOWA ACADEMY OF SCIENCES. 



Callipterus trifolii Monell. Abundant in autumn on Trifolium pratense Red 

 Clover). Mentioned in previous list as Callipterus. On Clover. Monell's descript- 

 ions in Canadian Entomologist had been overlooked. 



Chaitophorus populifolise Fitch. On Populus monilifera. 



Chaitopborus populicola Thos. (?) On Populus tremuloides. Aspen. 



Chaitophorus sp. On Populus tremuloides (Aspen). 



Chaitopborus nigra Oestl. Oq Sabx nigra. (?) (Willow). 



Chaitophorus sp. On Salix longifolia. ( ?) 



Melanoxanthus sp. Apparently undescribed. Occurs at the base of willow 

 bushes, and the secretion covering them is of such a color as to give the bushes the 

 appearance of being covered with the sediment of high water. Usually hidden in 

 rubbish or loose leaves. Only apterous forms have been taken. 



Cryptosiphum sp. On Artemisia frigida. Probably C. Artemisise Buckton, 

 but only apterous forms taken. 



Schizoneura lanigera Hauss. Not abundant on Pyrus coronaria. Since previous 

 list was published this species has been taken at Ames on Wild crab. 



Tetraneura graminis Monell. On Leersia virginica. 



Tetraneura ulmi L. On Ulmus americana winged forms of Tetraneura gram 

 inis were found flying from Leersia virginica, and at the same time winged speci- 

 mens of Tetraneura ulmi were observed alighting and hiding under rough bark of 

 the elm. where afterward the peculiar males and females of the latter were found 

 as also the single egg of the female. 



Colopha ulmicola Fitch. Included under Glyphina in previous li?t. Specimens 

 this season were taken on the bark of Cork elm in October. 



Colopha eragrostidis Middleton. On Eiagrostis Frankii and Purshii. Not 

 compared with the original description. So far as descriptive characters go there 

 is no difference between this species and the one occuring on elm. 



Pemphigus attenuatus n. sp. On Smilax rotundifolise. They accumulate in 

 colonies extending for a foot or more along the vine and give it the appearance of 

 being two or three times its normal diameter and of a grayish woolly surface, or as 

 if covered with some abnormal growth. The lice hang by their beaks with the 

 end of the body held at right angles to the vine so that the outer surface is quite 

 uniform. Some specimens nearly the same it not identical with the winged forms 

 of Smilax were taken in August, 1889. These were covered with an extremely long 

 white excretion. In flight the dense cottony mass made them appear like large 

 flakes of snow. 



Description. — Body robust purple black. Head broad. Antannse wide apart 

 nearly as long as body, dusky throughout. Wings narrow, attenuate at tip, veins 

 very slender, legs black, tibiae slightly pale toward apex. Described at time of 

 collecting. 



Alate viviparous female form: Length of body 1.8 to 2 mm. of antenna, 1.33 

 to 1.34(10.5; m. II 0.12mm.; Ill 0.22 mm.; IV 0.25 mm.; V0.30mm.; VI includ- 

 ing nail 0.30 mm.) Width of body 0.7 mm.; length of wing, 3.6 to 3.9 mm.; 

 width, 1 mm. Rostrum reaching beyond second pair of caxae. Wings narrow, 

 pointed, from which the name is derived. Third discoidal obsolete at base; the 

 first and second discoidals approximate at point of issue. The same is true of the 

 discoidals of hind wings. Stigma long and narrow ; stigmal vein nearly straight 

 and running nearly to apex of wing, approaching in this respect some species of 

 Lachnus. Cauda and cornicles obsolete. Antenna) not annulate, third joint with 



