ALEYROBES — CECIDOMYIA. 281 



Description of a new species of ALEYRODES. 



BY HENRY SHIMER, A. M., M. D. 



Aleyrodes asarumis, n. sp. 



Whitish, farinose, downy, especially on the wings. Head, thorax 

 and abdomen pale yellowish-white. Wings laid flat on the back in re- 

 pose, short and broadly rounded at the apex ; near the extremity, 

 where the strong central vein branches, a dark macula in the form of 

 an obtuse angle, opening posteriorly towards the apex of the wing. 

 The posterior wing has a similar but fainter spot. Antenuse six-joint- 

 ed, first thick, clavate. Eyes brown, two-parted. Tarsi long, exceed- 

 ing two-thirds the tibiae. 



I find these insects during the entire summer, on the under side of 

 Aaarum Canadcm^c (Wild Ginger) in September.* I have seen them 

 very numerous in all stages, the larva and pupa presenting the usual 

 scale-like form of this family ; at this time the under side of the leaf, 

 that has reared a good colony, is covered with a white downy secretion. 

 The imago when slightly disturbed flies away, acting not much unlike 

 small Tineina, hence it may often be found on trees, &c., but I have 

 only observed the larva on the above-named plant, and believe it to be 

 entirely confined to it. 



Mt. Carroll, 111., August 24, 18G7. 



Description of a new species of CECIDOMYIA. 



BY HENRY SHIMER, A. M., M. D. 

 CECIDOMYIA ACERIS, n. sp. 



Antenna; brown, 9 fifteen-jointed, joints sessile, first campanulate, 

 second globular, others ovoidal, subsessile, all verticillate hairy ; % fif- 

 teen-jointed, joints pedicelled, the pedicel being about equal to the joint, 

 verticillate hairy, the hairs more numerous and much longer than in 

 the female. Head and thorax black. Abdomen brown, darker in the 

 male. Legs drab-grey, feet reddish-brown. Wings hairy, the hairs 



"•■•On the 1st of October, after the above was in type, Avhile I was on a botani- 

 cal excursion, I found a solitary specimen oi Aciara alba, Mich. (White Cohish) 

 growing in the midst of a patch of Wild Ginger, with probably a hundred of 

 the above-named insect, in various stages of development, on the under side 

 of the leaves. 



TRANS. AMER. ENT. SOC. (36) OCTOBER, 1867. 



