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and considerably elbowed at basal third, whence spring the discoidals, 
the first bending slightly toward posterior margin, the second toward 
costal margin, the spaces between the tips of the costal and the dis¬ 
coidals subequal, and together rather more than half of posterior bor¬ 
der. [An examination of fourteen specimens only showed one with 
the third discoidal forked on both wings, and another with the same 
vein forked on the left wing, and the second discoidal also forked 
near tip.J When newly hatched, or in the first age, the basal joint 
of tarsus is scarcely perceptible, and the tarsal hairs are simple; the 
antennae (Fig. 45, c) are 4-jointed, the basal joint half as long as the 
2d; 3d and 4th somewhat longer and subequal; the 4th suddenly nar¬ 
rowed at tip; the promuscis reaches beyond hind coxae. After first 
molt, the antennae (Fig. 45, d) are 5-jointed, the 4th very short and 
almost globular; the promuscis now reaches to the middle coxae only. 
In the pupa state, the antennae are 6-jointed. 
Young from winged female similar to the same stage of its parent, 
except in the promuscis reaching beyond anus (Fig. 45, e). Length 
0.15mm. 
Throughout Central Colorado, July (Riley); Southern Kansas 
(Mon ell). 
M This species forms' a very interesting gall, which may be called the 
bead-like cotton-wood gall, occurs on the narrow-leaved cotton-wood 
(Populus balsamifera , L., var. angustifolia , Torrey), during the 
summer, in Colorado, and probably wherever this narrow-leaved 
variety grows. Though I have often found the tree in question so 
covered with these galls, especially at Greeley, that not a leaf was ex¬ 
empt, yet Populus monilifera , even when growing along the bank of 
the same irrigating ditch and mingling its branches with angustifolia , 
would be entirely free from them. The galls when not very numer¬ 
ous appear most commonly on the terminal leaves of a twig. They 
form a confluent series of pale yellow ovoid swellings, each side of 
the midrib (Fig. 46, g) recalling, in the distance, a lot of unripe, 
cherries, or, again, the galls produced on a true willow by the Saw- 
fly larva— Nematus salicis- pornum , AValsh. There will sometimes be 
three rows of these swellings, and they are not infrequently tinted 
with red. There are, however, more often but two rows, occupying 
nearly the whole space each side of the midrib. The galls are formed 
by the folding under of the sides of the leaf and the bulging of the 
same around the insect, which is always found solitary.” 
Hormaphis spixosus. Shimer. 
“Hamamelistes spinosus , Shimer, Trans. Am. Ent. Soc. i, p. 284, 1867. 
Winged female (Fig. 46, b): Expanse 5mm. Color dark brown, uni- 
formerly pulverulent, the abdomen slightly paler and filled with egg¬ 
like bodies. Head with a frontal tubercle, and with the promuscis 
not reaching to beyond front coxae. Antennae (Fig. 4 6, d) reaching 
to base of front wing; 5-jomted, joints 1 and 2 bulbous and smooth, 
the others with about 50 close and regular and well-defined annulations; 
