1863.] 
285 
Male. “Ferruginous; orbits and head before, yellow; antennae 
blackish towards the tip; first joint yellow beneath; collar, line over 
the wings, two obsolete ones in the middle, wing-scale excepting a dot 
in the middle, yellow ;• scutel undivided, yellow; metathorax in greater 
part, yellow; abdomen yellow, posterior margins of the segments black, 
submargins ferruginous. Rather more slender than the female.^’ 
Three 9 and two % specimens of this beautiful species, from Rock 
Island, Ill. (Coll. Benj. I). Walsh, Esq.)^ differs from Say's descrip¬ 
tion above quoted as follows: 9 .—Head beneath the antennae is yel¬ 
lowish-ferruginous ; the labrum and sides of the face being sometimes 
yellow; the “dull ferruginous margin over the wings" is, in one speci¬ 
men, indistinct, and in another specimen the thorax above is ferrugin¬ 
ous, with a broad black longitudinal dorsal line, and on each side of it, 
a longitudinal blackish stain; the tegulae in two specimens are yellow, 
with a fuscous dot on the disk; the femora behind are sometimes en¬ 
tirely ferruginous and the tips of the tibim within are blackish, some¬ 
times indistinctly so. The two yellow bands of the abdomen beneath 
are on the second and third segments. % .—Black, instead of ferrugi¬ 
nous ; the face beneath the antennae is yellow, and on each side of the 
clypeus a minute black dot; the yellow orbits of the eyes do not reach 
their vertex; the thorax is black, and there is no appearance of a “ line 
over the wings" and “two obsolete ones in the middle;" the tegulae 
are honey-yellow; the scutellum has two small yellow spots; each side 
of the metathorax also with a small yellow spot; the posterior femora 
within are black; the first segment of the abdomen above has a narrow 
ferruginous band, which, in one specimen, has on each side of the disk 
two small yellow spots close together; the yellow band on the second 
segment is broadly indented on the disk anteriorly and in one specimen 
the band on the third segment is broadly and squarely indented on the 
disk anteriorly; the apical segment beneath is yellow. Length 3^ 
lines. 
I rather suspect that Say described a small and slender 9 of JV. lu- 
teola St. Farg., as the % of his vincta^ as I have some small and slen¬ 
der females of the former species which answer to Say's description of 
the latter, and which at a glance have the appearance of males. 
The females of vincta resemble some of the 9 varieties of luteola^ 
but they may be easily distinguished from the latter by the much finer 
