1864.] 
497 
immaculate or rufous with the two basal joints and a few terminal ones brown¬ 
ish. Thorax glabrous opaque, with the appearance of fine appressed pubes¬ 
cence; two acute longitudinal striae, subobsolete in front, converging on the 
scutel, and a central one extending from the scutel halfway or less to the col- 
lare. A large, highly polished spot under the wings. Scutel finely rugose, the 
basal fovese obsolete or subobsolete. Abdomen glabrous, joint 1 short and trun¬ 
cate conical, 2 and 3 connate and together covering from § to f of its whole late¬ 
ral surface except joint 1, the dorsal edge of these two joints describing a cir¬ 
cular arc of 25°; 2 basally with appressed pubescence, and dorsally in nearly 
equal in length to 3, but in 9 only half as long. “Ventral valve” 9 yellowish 
and thin, moderately large, its tip unarmed and in an angle of 60°. Sheaths 
polished and projecting about .03 inch above the dorsal line, often with the 
ovipositor protruding from their tips. Legs honey-yellow, tarsal tips brown, 
and the tip of the hind tibiae often brownish % . Wings hyaline, veins mode¬ 
rately fine, yellowish-subhyaline, the principal ones sometimes lightly tinged 
with brown. Areolet large, but with its basal side often subobsolete. Radial 
area distinctly closed, scarcely twice as long as wide, the areolet placed about 
^ of the way from its base to its tip. Length .06—.07 inch, 9 •O'i'— 10 inch. 
Six % , twelve 9 , bred from the gall q. petiolicola 0. S. and Bassett. 
Differs from A. petiolicola 0. S., bred from the same gall and described 
from a single 9 specimen, in the antennae 9 being properly 12-jointed 
not 13-jointed, in the abdomen being black and not “ dark brown,” in 
the legs being honey-yellow except sometimes the tip of the ^ hind 
tibia, not “ infuscated except at the joints,” and in the areolet being 
only 4 of the way from the base of the radial area, instead of “ corre¬ 
sponding to its middle.” Notwithstanding all the above differences, 
Baron Osten Sacken’s insect is very probably identical with mine, as 
he says his petiolicola is closely allied in all respects to another species 
reared by him from q. tuber and stated to have ‘‘ 12-jointed antennae, 
if the last very elongated joint is counted for one.” (^Proc. Ent. Soc. 
Phil. I, p. 72.) Amhlynotus Bheinhardt, it appears, ought to have S 
14-, 9 13-jointed antennae, instead of S 15, 9 12 as in our insect. 
Baron Osten Sacken also doubts the fact of his petiolicola belonging ‘ 
to Amhlynotus because “ the 2nd segment of the abdomen is much 
shorter than the 3rd. (^IhicL p. 67.) In the S , but not 9 ensiger.^ 
these two segments, as above stated, are dorsally equal in length. I 
should not have described my species but for my happening to possess 
numerous specimens of both sexes all from the same brood. Ensiger 9 
might be easily mistaken at first sight for the large-sized and dark- 
colored specimens of Synophrus Iseviventris 0. S., but is distinguish- 
