AMERICAN IIOMOPTERA. 389 



sideration opens both above and below, the principal opening being 



beneath. 



Dactylosphaera caryaB-septum, n. sp. 



WiNOEii Imago.— Liglit orange-yellow, -vvith a black band arounfl the thorax; 

 the general resemblance being quite similar to the species from gall No. 1. Length 

 of body .04 ; to tip of wings .06 inch. 



Mother Insect — Pale greenish, slightly yellowish anteriorly; legs, antennte 

 and some spots on the back, blackish ; af)ex of abdomen obtuse, terminated by 

 a small central point, somewhat emarginate; otherwise like the mother insect 

 from gall No. 1. Length .25 inch ; breadth .15 inch. 



Gall No. 3. — On June 7th, I observed, placed in the common 

 petiole of the leaf, large, elongate, subelip.s3idal, 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 elongate, but at this date s;) clo<e as to be 

 scarcely apparent. These galls contain capacious cavities, in which 

 were found vast colonies of larvae, and an abundance of eggs. Trans- 

 verse diameter | inch; conjugate diameter | inch. 



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

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

 having transverse fissues on their outer surface. The first one opened 

 contained many hundred Avinged images, all dead, and in the midst of 

 them was a large syrphidian larva. I found only one gall that con- 

 tained perfect living imagos, the inhabitants of all the other galls that 

 were examined, having been destroyed by various enemies. 



Dactylosphaera subellipticum, n. sp. 



WiVGHD iM.VGO. — Large and robust, blackish, with abdomen light yellow; 

 antennae end logs blackish ; wings hyaline. Length of body .08 — .07 ; to tip of 

 wings .08— .09 inch. 



Mother ixsECT. — Rugose, greenish-yellow ; antennre and legs black : otherwise 

 like that from gall No, 1. Length .00 ; breadth .04 ; thickness .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. 



Gall No. 4. — These galls were found to be exceedingly numerous 

 on some trees. On June iJOth, they were saiooth, slightly rounded above, 

 pale yellowish-green; beneath somewhat whiter, and having in the 

 centre a nipple-like projection; opening round, surrounded with a burr- 

 like fringe composed of many tiliments,the cavity like an inverted cone, 

 the wall above being quite thin and translucent, so that the inmates 



