310 
[November 
the abdomen ; sometimes there is an indistinct blackish transverse 
stain on the middle of the segments ; extreme base of the first segment 
above more or less black; beneath ferruginous. Length 4—4^ lines. 
Hah. Conn., N. J., Penn., Md.,and Ill. (Coll. Ent. Soc. Phil., and 
Mr. E. Norton.) Thirteen 9 specimens. % unknown. 
I have failed to identify the species with either JV. Americana Kirby, 
or N. valida Smith, to both of which it is closely allied. Some of the 
specimens before me were labelled as N. valida Smith, but they do 
not satisfactorily agree with the description of that species; they seem 
more closely allied to N. Americana Kirby, but there is no “ black 
spot on each side of the breast,’’ and the second and third segments of 
the abdomen are not “ brown at the apex.” However, allowing a wide 
latitude for variation, which is sometimes so great in this genus, it may 
probably prove identical with either of the above-named species, hence 
I have described it as a doubtful new species. 
This species is probably what Say considered as a variety of his N. 
hiiiignata with immaculate abdomen. 
In addition to the species above described, the two following are said 
to have occurred in North America. I have not been able to identify 
either species from among the specimens I have examined. I copy 
Mr. Smith’s excellent descriptions of these two species, thinking that 
they might, perhaps, prove useful to students not having the original 
descriptions accessible. 
31. N. rulicornis Linn. 
Nomada ruficornis Linn. &C. Smith, Bees of Great Britain, p. 118. 
“ Female. Length 3—5 lines.—Head and thorax black, the clypeus 
and a spot above it, a line encircling the eyes, the labrum, mandibles 
and antennae rufous; the scape has sometimes a black line at the sides. 
Thorax: the collar, tubercles, and a large patch on the sides beneath 
the wings, an epaulet over the tegulae, the scutellum, two minute spots 
beneath uniting with a larger patch on each side of the metathorax, 
two broad stripes on the disk, the tegulae and legs, rufous; the femora 
more or less black at the base beneath; the coxae and trochanters also 
sometimes stained ; the wings fusco-hyaline and having a dark narrow 
fuscous cloud at their apical margins. Abdomen rufous, the base and 
the apical margins more or less black, the second segment having on 
each side a large angular yellow macula, the two following a broad 
