694 Wisconsin Academy of Sciences, Arts and Letters. 
species, a lateral view, or a sagittal section of a pupal case, 
would be almost identical. 
Habits and Occurrence .—These larvae are quite common in 
Lakes Mendota and Monona in very shallow water, where stones 
abound. They are by no means to be found everywhere that 
the conditions are apparently right, however. Thus, for a short 
distance along the South shore of Picnic Point, near the end 
of the same, they are plentiful, but a similar stretch of shore 
continuous with this and apparently exactly like it, will yield 
none. 
Several of the pupae of this species were found to be infested 
with a small mite. On a single individual 44 of the parasites 
were counted, the pupa having the appearance of having been 
dead at the time it was placed in the preservative. I know of 
no such instance having been previously recorded. 
Imagos appeared in the laboratory late in June. Specimens 
were taken with the trap lantern early in July. 
(PL LIII, Fig. 2. PI. LVIII, Figs. 8-45.) 
Leptocerus tarsi-punctatus nov. sp. 
Imago .—Length of body, 6 mm. Expanse, 18-20 mm. An¬ 
tennae fuscous, annulated with snow-white, the annulations les3 
distinct toward the tip. Maxillary palpi brown, with brown 
hairs, the distal two joints with admixed white hairs. Head 
and thorax dark rufous, the warts and pubescence much as in 
dilutus, but the admixed dark hairs are lighter than in dilutus 
or ancylus, being golden or reddish-brown, and the warts in 
front of the eyes are clothed with all brown hairs. Abdomen 
green to brown. Legs rufescent with silvery pubescence; feet 
white, but all the tarsal joints are flecked distallv with brown. 
Anterior wings with luteous and brown pubescence (the whole 
lighter than dilutus ), a luteous spot at the arculus. Posterior 
wings grayish-hyaline, a little more reddish than in dilutus. 
A lateral view of the male genitalia shows the relationship of 
this with the other species of the genus herein described, as well 
as its specific distinction. The superior appendages are long, 
narrowed at the tips, with a distal cluster of long hairs. The 
penis cover is very long and narrow, much more of it being vis- 
