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(lomya, the posterior vein of the wing being interrupted, the basal 

 portion sending a deflected filament (which does not seem to be 

 hollow) to the middle of the posterior margin. The disrupted 

 parts of the posterior vein pass and run parallel to each other for 

 a short distance, the apical portion being the more anterior. 



Two species of minute parasitic Hymenoptera destroy a great 

 many individuals of this insect, which, in conjunction with Odonta 

 scutellaris, Oliv., has for several yeai's killed the foliage of 

 Robinia in southeastern Pennsylvania, so that the trees present 

 the appearance of having been destroyed by dry weather, the 

 brown leaves remaining upon the tree. This happens chiefly in 

 August. 



EKIOPHILUS. Hald. 



The new geijeric name (meaning wool-loving) is given in allu- 

 sion to Eriosoma, upon which this insect is parasitic ; and the 

 trivial name mali has reference to the apple-tree, upon which it 

 is found. 



Observing the dead and black specimens of Eriosoma, with the 

 body plump, but hollow, and a small perforation posteriorly, we 

 examined other individuals without the perforation, and found 

 them to contain the naked pupa of a minute hymenopterous in- 

 sect, which, before it left the larva state, must have bored through 

 the belly of the Eriosoma and aflixed it to the branch. 



This insect belongs to the family of Ghalcididce, and has the 

 following generic characters : — 



Head free, transverse, eyes large, and set with short stiff hairs ; 

 antennae with short pile, elbowed, with six articidations, the first 

 long (in the male), the second subconical, the third and fourth 

 short and equal, the fifth subcylindrical, and the sixth fusiform ; 

 in the female the flagellura is fusiform, the second and fifth joints 

 short, and the wings ample, the anterior on'e with the subcostal 

 vein straight, the stigmal branch very short, and difficult to distin- 

 guish ; basal portion of the disk without pile, anterior and ex- 

 terior margin short ciliate ; posterior wing ciliate with long hairs. 

 Feet slender, pentamerous, adapted for leaping ; medial tibial 

 spine long, anterior one curved. Abdomen sessile, and rather 

 long, having a sharp slender exsertile sting or ovipositor in the 

 female. Pupa without a follicle. 



