222 
Psyche 
Rybaxis truncaticornis Brendel. 
[December 
This species was described by Brendel in two lines as a 
variety of conjuncta, as he understood the species. It is however 
entirely distinct in numerous respects from the supposed as well 
as the true conjuncta, differing from all our other species except 
the next by the oblique tooth on the lower surface of the last 
antennal joint in the male. The anterior coxae of the male are 
armed with a small apical tooth. 
The type locality is Iowa, and all specimens seen by me are 
from that state; most, if not all of them taken at Iowa City and 
distributed by Prof. Wickham. 
! 
Rybaxis obliquedens sp. nov. 
Closely related to the preceding species by the oblique tooth 
of the terminal joint of the antennae in the male, and the more 
than usually approximate dorsal abdominal carinae; but the 
metasternal prominences which in truncaticornis are feebly de- 
veloped, are here long and acute. In the form of the process 
arising from the second ventral segment, with its total lack of a 
surmounting horizontal plate the present species is unique among 
our representatives of the genus. The anterior trochanters of 
the male are armed with a long slender spine instead of a short 
tooth as in truncaticornis. 
Seven examples of this species are before me, all sent by 
Mr. Liebeck. These include 1 c? and 4 $ s from “Pa.” (vicinity 
of Philadelphia), 1 <T from Burlington, Iowa) and 1 c? without 
locality. The Pennsylvania male is taken as the type. 
Rybaxis conjuncta Le Conte. 
The peculiar greater angular prominence of the pronotal 
disk at the middle of the hind margin in the male, and with it a 
correspondingly more pronounced angle at the middle fovea be- 
tween the parts of the biarcuate groove, distinguish this species 
from all others. This character is only feebly indicated in the 
female. All three joints of the antennal club in the male are 
sparsely asperate beneath; the dorsal abdominal carinae are sep- 
