130 IOWA ACADEMY OF SCIENCES. 



GlypMna ulmicola Fitch. Quite common on elms, producing tlie "Cocks- 

 comb gall." 



PempJiigtis tessdata Fitch. Occurs on alder and has been sent to me 

 from the northeastern part of the State. 



Pemphigus acerifolii Riley. 



Pemphigus populi-irajisversiis Riley. On cottonwood. 



Pemphigus pojmlicatdis Fitch. Abundant on cottonwood. 



Pemphigus vagabundus Walsh. Its galls often to be seen on cottonwood. 



Pemphigus rhois Fitch. Common on sumac. 



Pemphigtis sp. On smilax. 



Chermes pinicorticis Fitch. Sometimes abundant on pines. 



Phylloxera vastairix Planch. Common on grapes. 



Phylloxera carym-folia; Fitch. On^^hickory leaves, producing galls. 



Aspidiotus ancylus Putnam., 



Aspidiotus nerii Bouche. Common on oleander. 



Diaspis cacti Comstock. On cactus in green-house. 



Chionnspis furfur us Fitch. Common on a variety of trees and shrubs. 



Chionaspis salicis Linn. Very abundant on willow and ash. 



Chionaspis pinifolii Fitch. This species has been reported, but I have 

 not seen it myself in the State. 



Mytilasx>is citricola Pack. Frequently seen on oranges and lemons in the 

 market, and doubtless occurs on orange trees where grown in the State. 



Mytilaspis pjomorum Bouche. Common on apple. 



DacLylopius adonidum Linn. Common "mealybug" of green-houses. 



Lecanium hespieriduvi Linn. Common on oleander, etc. 

 • Pulvinaria innumerahilis Rathvon. Common on maple and other trees. 



Kermes galliformis Riley. Common on oak. 



Kermcs sp. A species evidently different from the preceding has been 

 collected several times. 



Orthezia americana Walk. 



Sub Order PARASITA. 



« 



PEDICULID^. 



Pediculus capitis DeG. A not infrequent insect in some places. 



Pediculus vestimenti Leach. Not collected in Iowa, but should, doubtless, 

 be recorded. 



Phthirius inguinalis Leach. Occurs in Iowa as well as other States. 



Eamatopimis euryternus Nitzsch. The most common suctorial louse of 

 cattle. 



Ecematopinus viiuli Linn. Less common than the preceding. Infests 

 cattle. 



Ha;matopinus urius Nitzsch. Common on hogs. 



Ea'm aioinnus macrocephalus Burm. Occurs on horses; not common. 



Ecemat02nnus pilifer us Burm. On dogs; not often seen. 



Eamatox)inus snturaUs Osborn. Very common on the ground squirrels 

 Spermophilus tridecemlinatus and Franklini and also probably on the chip- 

 munk Tamias sti'iatus. 



