Reprinted with permission from: Mitchell, T.B. 1962 Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 152.|
FEMALE—Length 9.5-12 mm.; lateral ocelIi slightly nearer margin of vertex than to each other; cheeks subequal to eyes in width, posterior margin not carinate; shorter side of basal segment of flagellum fully equal to segment 2 in length, median segments slightly longer than broad; mandibles simple, rather robust; wings lightly infuscated, slightly darker apically, with the usual three submarginal cells, 2nd somewhat narrower than 3rd anteriorly, veins and stigma testaceous, basal vein interstitial with transverse median; tegulae shining between rather deep and distinct but fine and evenly distributed punctures; posterior margin of scutellum very slightly impressed medially; front coxae not spinose; apex of hind tibiae with a row of 3-6 rather short but robust, testaceous bristles; clypeus and supraclypeal area yellowish-testaceous, the labrum, basal half of mandibles, and broad, lateral, facial maculae, bright yellow, the lateral maculae terminating rather narrowly at top of eye, and cheeks very narrowly rimmed with yellow along eye margin; otherwise upper portion of face, vertex and cheeks black; antennal scape, pedicel and basal segment of flagellum testaceous, flagellum otherwise more piceous; pronotal collar, tubercles, tegulae, scutellum in large part, adjacent median area of metanotum, a pair of broad maculae on propodeum, a large anterior maculation on mesopleura, and front, mid and hind coxae in large part, bright yellow; thorax otherwise black, scutellum rimmed with black both anteriorly and posteriorly, and with a median black line; trochanters piceous, femora testaceous, more or less piceous along lower margin, tibiae and tarsi bright yellow, spurs pale yellow; abdominal terga 1-5 with transverse, entire, submedian, yellow bands, these somewhat narrowed medially on 1-3, very broad on 5, covering most of the disc; abdominal sterna piceous, 2-4 with more or less complete, submedian yellow bands; punctures over entire head quite close, deep and distinct, somewhat finer on cheeks and vertex, more distinctly separated on face laterally and below; scutum densely and rather uniformly rugoso-punctate, scutellum and pleura below somewhat more coarsely and distinctly punctate, becoming more closely crowded on pleura above; propodeum rather closely and finely punctate, lateral faces below becoming smooth and somewhat shining, triangle impunctate, dull and densely tessellate, becoming somewhat striate along upper margin; abdominal terga very finely and closely but deeply and distinctly punctate throughout, the punctures becoming inevident at base of tergum 1, somewhat more coarse and sparse on tergum 5, only the very narrow apical rims of each impunctate; pseudopygidium transverse, very short, forming the truncate apical margin of tergum 5, covered with very dense, pale, sub- erect tomentum; pubescence extremely short, thin and obscure, hardly evident, entirely pale where visible; sternum 5 apically with a conspicuous tuft of elongate, yellowish hairs on each side.
MALE—Length 9-11 mm.; lateral ocelli slightly nearer margin of vertex than to each other; cheeks slightly more than half width of eyes, posterior margin rounded; antennal scape bulbous, length only slightly exceeding the maximum breadth, apex only slightly excavated, fully exposing pedicel, shorter side of basal segment of flagellum slightly longer than segment 2, following segments fully as broad as long; mandibles robust, entirely simple; wings subhyaline basally, becoming lightly infuscated apically, with the usual three submarginal cells, 2nd and 3rd subequal anteriorly, veins and stigma testaceous, basal vein interstitial with transverse median; tegulae shining between deep, distinct and rather close punctures throughout; posterior margin of scutellum narrowly and slightly grooved medially; anterior coxae not spinose; hind femora unmodified; apex of hind tibiae with a row of 5 or 6 rather short but robust, testaceous bristles; labrum, basal half of mandibles, entire face below antennae, and a narrow band completely encircling eyes, bright yellow, a small yellow spot just below anterior ocellus; otherwise upper part of face, vertex and cheeks black; scape yellow anteriorly, becoming testaceous posteriorly, flagellum largely testaceous, more or less piceous above toward apex; pronotal collar, tubercles, tegulae, scutellum, adjacent median area of metanotum, two large maculations on propodeum, a large anterior maculation on mesopleura, and all coxae, bright yellow; scutum narrowly ferruginous on each side, thorax otherwise black; trochanters and femora in general testaceous, the femora more or less yellowish anteriorly, tibiae and tarsi yellow, hind tibiae more or less testaceous over apical two thirds, spurs pale yellow; abdominal terga 1-6 with entire, transverse, broad, submedian, yellow bands, these slightly narrowed medially on 1-3, quite uniformly wide on 4 and 5, more restricted on 6; sterna 2-4 with more or less conspicuous, basal, yellow bands that are considerably narrowed at mid-line, 5 with a small, submedian, yellow maculation; sterna otherwise yellow-hyaline apically, more or less darkened between these areas and the maculations; punctures quite close, deep and distinct over entire head, somewhat finer on cheeks, somewhat more sparse on each side of clypeus below, those on clypeus medially rather coarse, very close and irregular; scutum densely and rather finely rugoso-punctate; pleura below very coarsely and distinctly punctate, punctures becoming slightly closer above; propodeum rather closely and deeply punctate, lower margin laterally becoming shining and impunctate, the triangle impunctate but dull and tessellate, becoming very finely and irregularly rugoso-striate along upper margin; abdominal terga deeply and distinctly but very finely and closely punctate throughout, punctures becoming inevident at base of tergum 1, somewhat coarser and more widely separated on the more apical terga, only the very narrow apical rims impunctate; pubescence extremely short, thin and inconspicuous, pale yellowish where visible; basal width of pygidial plate (fig. 104) about equal to median length, strongly narrowed apically to the narrowly rounded apex, margins carinate, surface very finely and shallowly punctate; sternum 6 quite broadly rounded, rather deeply and closely punctate, at least toward base; sternum 8 (fig. 104) with an elongate, slender, apical process, with a few robust setae at tip; gonocoxites of genital armature (fig. 103) broad at base but not lobate, gonostyli slender and elongate, thinly short pubescent, somewhat produced on inner side at base but not tufted.
DISTRIBUTION—Kansas and Nebraska, east to North Carolina, July to September.
FLOWER RECORDS—Bidens. Recorded by Robertson (1929) on Aster and Helianthus.
Recognition of another form of this species, heterochroa Cockerell, from Colorado makes the subspecific designation of this typical form of vincta necessary.
Reprinted from: Cresson, E. T. 1863. On the North American species of the genus Nomada. Proc. Entomol. Soc. Phil. 2:284-286
Nomada vincta Say, Bost. Journ. Nat. Hist, i, p. 401. % 9. (1837.)
Nomada pulchella Smith. Brit. Mus. Cat. Hym. ii, p. 247. %. (1854.)
Body black : head beneath the antennae, ferruginous :
orbits yellow : antennae ferruginous, dusky about the middle ; terminal
joint paler : collar yellow : thorax each side over the wings, with a dull
ferruginous margin ; before the wings a yellow spot : wing-scale honeyyellow
: wings slightly dusky, particularly the terminal margin : nervures
honey-yellow : scutel subbilobate, yellow, line on the middle posterior
margin ferruginous ; metathorax near the scutel with a transverse
line and an irregular, longitudinal, quadrate spot on each side
behind, yellow : tergum with a yellow band, gradually contracted towards
the middle, and obsoletely margined with ferruginous, before
the middle of each segment ; anterior band a little undulated or denticulated
: pectus with a triangular, yellowish spot over the fore-feet :
coxse, black, with a yellow spot : thighs ferruginous, blackish behind :
tibiae and tarsi ferruginous and yellow : venter with two yellowish
bands; towards the tip honey-yellow. Length 9 nine-twentieths of
Ferruginous ; orbits and heiid before, yellow ; autennse
blackish towards the tip; first joint yellow beneath; colLir, 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,
submaryins ferru<>;iuous. Rather more slender than the female."
Three 9 '"id two % specimens of this beautiful species, from Rock
Island, 111. (Coll. Benj. D. Walsh, Esq.), difi'ers from Say's description
above quoted as follows : 9 •—Head beneath the antenna is yellowish-
ferruginous ; the labrum and sides of the face being sometimes
yellow; the ''dull ferruginous margin over the wings" is, in one specimen,
indistinct, and in another specimen the thorax above is ferruginous,
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 entirely
ferruginous and the tips of the tibiae within are blackish, sometimes
indistinctly so. The two yellow bands of the abdomen beneath
are on the second and third segments. % .—Black, instead of ferruginous
; 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 Bylines.
I rather suspect that Say described a small and slender 9 of N. luteola
St. Farg., as the % of his vincta, as I have some small and slender
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
punctation of the head and thorax. The males also very much resemble
those of latmla, but the yellow abdominal bauds of the latter are more