688 Wisconsin Academy of Sciences, Arts and Letters. 
LEPTOCERIDHL 
Leptocerus dilutus Hagen. 
Leptocerus dilutus Hagen, Syn. Heur. X. Am., 1861, 277. 
Banks, Cat. Heur. Ins. IT. S., 1907, 45. Ulmer, Coll. Selys, 
Ease. VI, 1907, 45; Gen. Insectorum, Ease. 60, 1907, 136.. 
Imago .—Length of body, 5-6 mm. Expanse, male, 18-20 1 
mm.; female, 16-17 mm. Antennae, male, 18 mm.; female,. 
10 mm. Antennae brown, the basal joints, to about the 16th, 
annulated with snow-white on the proximal half. Head and 
thorax dark brown, nearly black. On the bead a pair of wart& 
(or a single median one) between the concavities which are- 
found posterior to the antennae;- a second pair just outside the 
first and posterior to the concavities; a third just within and 
behind the eves* and a fourth in front of the eyes, beneath the 
bases of the antennae, all clothed with snow-white hairs, inter¬ 
mingled with which are a few black ones. A pair of promi¬ 
nent warts on the pronotum, and the wing callosities, also- 
clothed with snow-white and black hair. On the mesonotum 
short white hair is parted by a shallow impressed median line, 
and on either side of this is a ridge on which short white and 
black hairs lie parallel to the long axis of the body. Abdomen 
green to brown. Legs grayish-yellow, except fuscous coxae, 
clothed with silvery pubescence : brown spines on the tarsi. An¬ 
terior wings grayish-brown, with dense luteous and fuscous 
pubescence, fringed with dark gray or brown; a whitish-yellow 
spot at the arculus. Posterior wings grayish-hyaline, iridescent, 
with sparse gray pubescence, ciliated with same. 
In the male the 9th dorsal segment is extended medially, end¬ 
ing in a bifid tip. The superior appendages (appendices praea- 
nales of Ulmer) are plate-like, rounded at the extremities, with 
a border of long hairs. The large penis cover (Dorsalschuppe, 
Ruckensehuppe, or X segment of Ulmer) is rounded with a 
slight notch at the end, the border with a ring-like thickening: 
penis large, projecting downward from beneath the cover. The 
inferior appendages (Genitalfiisse of Ulmer) are long, directed 
