682 Wisconsin Academy of Sciences, Arts and Letters. 
less represented by the penis cover) : inferior appendages very 
large, consisting of two parts, as seen from beneath; the inner, 
ventral part is a short lobe terminating in a group of heavy, 
closely set spines: separated from this by a deep excision is the 
outer, dorsal portion, which is directed strongly upward and 
consists of a large lobe bordered on the larger terminal part by 
strong projections, each bearing a spine-like hair; the inner, 
concave surface is studded with similar projections and hairs. 
The outer surface is quite hairy, especially the ventral surface. 
Projecting between these is the broad penis cover, with a slight 
median indentation terminally, and with a few short hairs on 
the border. From beneath, the penis may be seen lying within 
the hollow of the ventral surface of the cover. The posterior 
margin of the 9th ventral segment of the male has a median 
rounded excision. A brown lobe or tooth is present on the 6th 
ventral segment, not on the 7th, as MacLachlan and Ulmer state 
for the genus. McLaehlan’s figures of II. sperata appear to 
indicate it on the 6th, and of revelieri on the 7th. 
Larva. —Length, 7-8 mm. Width, 1.5 mm. Body in life 
yellowish-green. Head and thorax very dark. Clypeus out¬ 
lined with white, and eyes situated in a light area. Five small 
spots located on upper part of clypeus, and two on either side 
of same. Head white ventrally, nearly hidden under the pro- 
notum normally. Gula not well marked or chitinized. Pro- 
thorax evenly dark, except fine white median line. Distinct 
fringe of hairs on sides and anterior edge, the latter pectinate 
with short spines. McLachlan says for the genus that the suc¬ 
ceeding segments are all soft, but this is not true for borealis . 
Mesonotum with a bunch of hairs at the anterior lateral angle. 
General color a little lighter than that of the prothorax. On 
this segment there is a white median line crossed at its middle 
by a transverse line which curves forward, meeting the anterior 
edge at a right angle: situated in this transverse band on either 
side of the median line, are three black dots. A white oblong 
spot on either side of the posterior part of the median line, and 
another near the posterior lateral border. Metanotum only 
partly chitinized. Legs brownish, more yellow on tibiae and 
tarsi, with scattered, slender hairs. Ho gills and no lateral 
