670 Wisconsin Academy of Sciences, Arts and Letters . 
toward the apex: fringed with black hair at the apex, shading 
into light golden along the inner margin. 
In the male the 9th dorsal segment is produced into a long 
plate, deeply cleft in the middle, its sides curving downward so 
that it is quite broad in lateral view: in the latter view the basal 
portion is large, separated from the smaller, oblong, distal por¬ 
tion by a constriction. Beneath the dorsal plate are the su¬ 
perior appendages, directed downward. Arising from the 
lateral portion of the 9th ventral segment is an appendage, nar¬ 
rowing toward the tip, directed upward, and curving inward,, 
the apex obtuse: this probably represents the intermediate ap¬ 
pendage. The inferior appendages are short, rounded, pointing 
somewhat downward and curved inward: within, each bears a 
heavy brown piece, arising from the inner dorsal edge of the 
appendage near its base, and curving downward, its apical mar¬ 
gin toothed. The end of the latter piece nearly meets with a 
small chitinous projection arising from the ventral margin of 
the segment on either side of a median excision. A few very 
long hairs are present on dorsal segments 7 and 8. 
The spur number of the genus does not seem to be uniform. 
Only two other species are known. McLachlan, who described 
the genus and the first species (1873) gives the number as 
1, 2, 4. N. fuscus Banks (1903) has 1, 2, 2. The number is 
quite variable among the individuals of autumnus, but an ex¬ 
amination of a large number proved that 1, 3, 4, as given, best 
represented the average condition. 
Larva. —Length, 8-10 mm. Width, 2 mm. Body yellowish,, 
reddish on the dorsal surface. Head small, very dark, with a 
few lighter spots forming an irregular group on the clypeus,. 
near the point: a row of four spots on either side of the cly¬ 
peus. In a dorsal view of the larva little of the head is visible, 
the pronotum projecting forward over it. Pronotum lighter 
in color, especially anteriorly, beset with short hairs; indistinct 
spots on the posterior half; anterior edge pectinate with short 
spines. Ho “horn” on the prosternum. Mesonotum very dark 
with black border on outer posterior corner, within which is a 
small lighter area; there is a white median line on this seg¬ 
ment. First pair of chitinous shields on the metanotum very 
