36 
[April 
of the radial area is not so much due to a vein, as to a thickening of 
the margin of the wing, which appears like a prolongation of the sub¬ 
costal vein. This thickening is more or less apparent in different spe¬ 
cies, and hence, doubts may often arise as to the radial area being open 
or closed. (Hartig himself, pag. cit., calls it, in some species, JialJ'-dosed?) 
The two N. American Diastrophus-gdXh and their insects may be 
described as follows. 
Rubus villosus (?). Blackberry. Elongated.^ abrupt.^ pithy sioell- 
ing on the twigs, from an inch to three inches in length. Diastro- 
PHUS NEBULOSUS n. sp. 
This deformation, chiefly due to a hypertrophy of the pith, in con¬ 
sequence of the sting of the insect, is very common in the environs of 
Washington. Its color is generally dark red or reddish brown; its 
shape oblong; its surface generally uneven with irregular tubercles, or 
with deep longitudinal furrows, dividing the whole gall in four or five 
parallel ridges. The full-grown specimens are usually 2 or 3 inches 
long, and from | to an inch in diameter. A transverse section of the 
gall shows a large number of oblong cells, about 0.13 long, arranged 
for the most part near the middle of the gall; their intervals are filled 
with soft pithy matter and harder woody fibres. From galls collected 
in the fall, the insects usually come out during the winter and in the 
spring. 
Besides the Diasfrophui and the Aulax, I have reared from these 
galls parasites belonging to the genera: Callimome (two species), 
Orniyrus and Eurytoma. 
Diastrophus nebulosus n. sp.—Pitch-black, smooth and glossy above, antennse 
and feet red; wings hyaline areolet second transverse vein and tip of 
the subcostal slightly clouded; length, 0.08—0.1; 0.1—0.11. 
% antennse 14 jointed; third joint slightly excised below. 
9 13 third joint entire. 
Head pitch-black, mandibles more or less reddish, tip black; face also some¬ 
times tinged with brownish or reddish, especially round the mouth, the face is 
sculptured with fine scratches, (aciculated) convergent towards the mouth; its 
middle shows an elongated, smooth swelling; above antennae, the head is smooth 
and shining; antennae reddish sometimes darker at tip, ('^ ) 14, ( 9) 13-joint- 
ed; the 3d joint of the is the largest, excised beneath; last joint longer than 
the preceding, but shorter than the two preceding taken together, pointed, almost 
conical; last joint’of the 9 as long as the two preceding together, subcylin- 
drical, pointed, showing slight indications of a subdivision into three joints; 
