1863.] 
185 
The following species belonging to this section of Psocus have been 
obtained by me near Rock Island since my paper was published ; 
Ps. conterminus, n. sp.—Blackish. Head with the nasus obscure greenish or 
luteous. Sutures of thoracic notum but slightly pale. Legs dull pale greenish 
or luteous; tarsi fuscous. Wings hyaline, veins moderately fine, fuscous; the 
submedian vein attaining the 2nd sector within about the space of twice its 
own breadth, so as almost to close the discoidal cellule, and then turning sud¬ 
denly back so as to form a posterior marginal cellule nearly in the shape of an 
equilateral triangle. Pterostigma three times as long as Avide, very pale fus¬ 
cous, sometimes darker at the basal end, the angle next the disk much rounded 
off. Length to tip of Avings 4^ mill. 
One mature % , one immature 9 ? Very distinct from any described 
X. A. species. Has the general appearance of semistriatus Walsh, 
which, belongs to the preceding Section, but the antennae % are much 
more robust and the neuration of course is different. 
Ps. confluens, n. sp.—Dull luteous.. Head Avith the eyes and ocelli brown- 
black; antennae, with joints 1 and 2 luteous, 3 fuscous, the rest deficient. Up¬ 
per surface of thorax, except the sutures, broAvn-black. Legs Avith the knees 
and the tips of the tarsi obfuscated. Wings narrow, brownish subhyaline, veins 
very coarse and brown; pterostigma colored as the wing, long and narrow, 
about 4 times as long as Avide, the angle next the disk almost entirely rounded 
off; the submedian vein not nearly attaining the hind margin of the wing 
before it curves toAvards the 2nd sector (or 2nd discal bifurcation) and sweeps 
back to the interior mai’gin to form the posterior marginal cellule, Avhich is 
consequently open at its basal end, and forms a semicircle. Discal bifurcation 
acute but peduncled. Length to tip of wings 3 mill. Expanse 51 - mill. 
One specimen, remarkable for the two sectors in the left wing unit¬ 
ing together some distance before they reach the tip, a monstrosity 
which I have not noticed in any other species. Differs from Ps. mo- 
bilis Hagen, a Cuban species, in not being hairy. 
Ps. rufus, n. sp.—Rufous, immaculate. Head Avith the antennse fuscous, ex¬ 
cept the three basal joints. Abdomen with the sutures a little darker. Tarsi 
obfuscated. Wings hyaline; veins slender, black ; pterostigma three times as 
long as wide, with the angle next the disk rounded, slightly obfuscated, with 
the usual black dot at its basal end; submedian A^ein attaining the hind mar¬ 
gin of the wing before it curves round to form the posterior marginal cellule, 
which is semicircular. Length to tip of wings 3^ mill. 
One specimen, readily distinguished from the preceding by its neu¬ 
ration, and by the much finer wing-veins, the shorter pterostigma and 
the wings not narrower than usual. 
Ps,.^perniadidus, n. sp.—Dull luteous. Headv^iih a large black spot on the 
ocelli and two dark dots placed transversely on the occiput; antennae pilose, 
fuscous except the three basal joints, which are pale. Lateral lobe (or scutum) 
