PERGANDE — NORTH AMERICAN PHYLLOXERIN^E. 25 I 



the American Entomological Society of Philadelphia, Vol. 2, 1868, 

 page 389 : 



"On June 7th I observed, placed in the common petiole of the leaf, 

 larf;e, elongate, subelipsoidal, nut-like galls, of a deep leaf-green color, 

 mottled with paler green, and somewhat nodulated ; some were irregular, 

 being on the side of the stem ; but most of them are quite regular in form 

 and completely surrounding the stem ; in these latter the leaves are very 

 much dwarfed. The opening is on the middle of the side, slightly elpn- 

 gate, bnt at this date so close as to be scarcely appp,rent. These galls 

 contain capacious cavities, in which were found vast colonies of larvas, and 

 an abundance of eggs. Transverse diameter five-eighths inch ; conjugate 

 diameter three-eighths inch. 



" By June 20th these galls had considerably changed in appearance, 

 being contorted into different shapes ; they had began to crack open, hav- 

 ing transverse fissures on their outer surface. The first one opened con- 

 tained many hundred winged unagos, all dead, and in the midst of them 

 was a large syrphidian larva. I found only one gall that contained per- 

 fect living imagos, the inhabitants of all the other galls that were exam- 

 ined haying been destroyed by various enemies." 



" Dactylosphcera subellipticuni n. sp. 



" Winged Imago. — [ Winged female]. — Large and robust, blackish, with 

 abdomen light yellow ; antennje and legs blackish ; wings hyaline. Length 

 of body .05-.07 ; to tip of wings .08-09 inch. 



"Mother Insect. — [Stem-mother]. — Rugose, greenish-yellow; antennse 

 and legs black ; otherwise like that from gall No. i {Dactylosphcera kemis- 

 phericum]. Length .06; breadth .04; thic' ness .03 inch. 



"The winged imago of this species is the largest yet observed, and the 

 eggs are more nearly globular than those found in other species of galls.' 



This may possibly be but a variety of Pk. caryxcaulis Fitch, 

 but not having had an opportunity to study its architects I prefer, 

 for the present, to leave it as a distinct species. 



Phylloxera perniciosa Pergande, n. sp. 



PI. VIII., fig. 45 ; PI- XV., figs. 120-123. 



Pi. XVIII., figs. 136-140. 



This is one of our most destructive species, occurring in the 

 District of Columbia, Maryland, Virginia and Pennsylvania, where 

 it takes the place of Ph. carycecaulis and Ph. magna, having the 

 same habit and there proving as disastrous to the foliage of 

 Hicoria tomentosa as those prove in the North and Northwest to 

 the other species of Hicoria. It attacks, as do those species, the 



