1863.] 
305 
side of the first segment a small yellowish spot which is generally want¬ 
ing ; on each side of the second segment at base, a large yellow ma¬ 
cula, either rounded or angular, pointed within and sometimes almost 
meeting on the disk, or forming a broad fascia somewhat atteuuated 
within and slightly interrupted on the disk; on each side of the third 
segment at base a smaller yellow macula, which varies in shape like 
those on the second segment, being sometimes a broad fascia, slightly 
interrupted on the disk, and sometimes reduced to a mere line on each 
side; the fourth, fifth and sixth segments have on each side an oblong 
yellow spot or a line, all of which are sometimes subobsolete or want¬ 
ing; apical segment ferruginous, bifid at tip; beneath ferruginous? 
with the base of the first and the posterior margins of all the segments 
more or less black. Length 3^—4^ lines. Eight specimens from Mas¬ 
sachusetts and Connecticut. 
This is evidently a very variable species and when a large series of 
specimens have been accumulated, they may possibly prove to be vari¬ 
eties of either Americana Kirby, valida Smith, ruficornis Linn., or 
bisignata Say; but with the limited number of specimens before me, 
it is impossible to identify the varieties with any described species, 
and I am therefore obliged to place them, for the present, under a new 
name. 
The males from which I drew out the above description and also 
some of the varieties of the female may not belong to this species, but 
as they approximate more or less, I would rather, for the present, in¬ 
clude them under one name. In Mr. Norton’s collection there is a 
large male (5 lines long) from Connecticut, which is colored and marked 
like var. c of the female, except that the face is densely clothed with 
silvery-white pubescence, and the anterior part of the clypeus, labrum, 
mandibles except tips, and the orbits of the eyes beneath and on each 
side of the clypeus, are yellow. 
25. N. bisignata Say. 
Nomada bisignata Say^ Long’s 2d Exp. ii, p. 354 9; Bost. J. 1^. H. i, p. 402 % . 
“ Female. Head ferruginous, front with a large black spot, confiu- 
ent with another transverse one on the vertex; occiput and throat 
black; antennae blackish, beneath rufous; stethidium black, varied 
with ferruginous, and like the head rough with dense punctures; tho¬ 
rax ferruginous, with a longitudinal black line; scutel ferruginous; 
