48 
throughout, somewhat more coarsely so than in P. pallipes. The 
dorsal outline of the metascutellum is concave, the metathorax 
being nearly truncate posteriorly, owing to a tuberosity projecting 
> from its upper posterior part. Metascutellum not margined or 
carinate. Antenna; eleven (thirteen) jointed, joints distinct except the 
third and the last three. In the female the first joint is pale yel¬ 
low, the second dark fuscous, and the remaining joints black. All 
but the first thickly black pubescent, those beyond the second 
having each a circlet of long appressed hairs. 
In the male the antennae are pale yellow throughout, similar in 
appearance to those of the female, but with the last two joints 
closely united, forming a compact ovate club. In both sexes two 
minute sub-joints occur between the second and third joints. Wings 
in all the specimens seen rudimentary, legs pale, the coxae, femora 
and upper half of the tibiae, tawny yellow, the remainder of the leg 
being pale yellow, except the tip of the tarsus, which is.dusky. 
Abdomen smooth, blue black above, lightening into piceous beneath, 
ovate, acute, in the female; smaller, obtuse, and more nearly oval in 
the male. 
Total length 2.12 mm.; head, .7 mm. wide; thorax, .45 mm.; abdo¬ 
men of female, .62 mm. by 1.05 mm.; antennae, .82 mm. 
This species appeared in our breeding cages of the Hessian fly 
during the months of June, July and August, in 1883 and 18S4. 
Flaxseeds collected August 7, 1883, at BuQuoin, from stubble in 
the field, yielded the parasite August 17; parasites emerged June 
21 from flaxseeds collected at Marshall on the 21st of May; those 
obtained at Robinson, in Clark county, May 25, emerged from the 
flaxseed June 20; and others obtained at Robinson, June 14, gave 
the parasites July 10. 
Tetrastichus carincitus, n. s. 
A slender, smooth, dark steel-blue species, 2 mm. in length, with 
pale legs, four-jointed tarsi and eight-jointed antennae. 
The head is very short, not wider than the somewhat slender 
thorax, impunctured, as are also the thorax and abdomen. Eyes 
large, dark red, broadly elliptical, occupying the whole longitudinal 
diameter of the head and even encroaching upon its posterior sur¬ 
face. Front broadly bisulcate for the reception of the. scapes of the 
antennEe. Antennae short, eight-jointed, joints very distinct, except 
those of the ovate club, (three in number), which are very closely 
compacted. Second joint shorter than the third, which is longer 
than fourth and fifth, these being subequal. First and second joints 
of the club nearly equal, thicker than the preceding. Flagellum ol 
the antennae pale, provided with a few erect black hairs, and long 
appressed yellow ones. 
Prothorax is very short; the mesoseutum very long, narrowing 
posteriorly, when it is broadly truncate against the scutellum, regu¬ 
larly convex, minutely carinate longitudinally on the middle lme, 
parapsidal grooves complete. Scutellum vaulted, with two longitud¬ 
inal carinae. Abdomen of female pointed ovate, broadest in iron 
of the middle, somewhat flattened above. 
