524 Wisconsin Academy of Sciences , Arts, and Letters. 
and lias a slight dorsal rounded hump, becoming rapidly con¬ 
stricted at the end to half the width at the base. The end is 
richly supplied with hairs and has some peculiar structures. 
It may best be described as consisting of two terraces, both with 
scalloped corners (IT 1 , IT 2 ). Between the humps forming the 
rounded corners of the upper is a depression, from the depth of 
which rises a small elevation (A). Between the side humps 
of the lower terrace, in the depression, is a little point (B). 
The middle depressed part extends out a little: beyond the cor¬ 
ners. The form of the body is rather peculiar, being broadest 
anteriorally, in the region, of the second pair of epimera; there 
are no humps or small elevations, and the anterior border is 
bowed out strongly. The area inside: the dorsal line has about 
the same elevation as the rest of the body. The whole dorsal 
side is moderately arched, and much higher than the appendage. 
The epimera, have the usual form, the fourth being broadest. 
The genital areas are unusually large, oval in shape, and form 
conspicuous rolls projecting out beyond the body wall. The 
fourth leg is like: that of other males of this group: of Arrenuri; 
the third, fourth and fifth joints being richly provided with 
swimming hairs, and the fourth bearing the usual short process. 
The fourth segment of the palpus is longest, and has a sickle- 
shaped bristle; the fifth is small and forked, and the second has 
one or more stout barbed bristles. 
