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 7-8 mm.; lateral ocelli subequally distant from margin of vertex and each other; cheeks slightly more than half width of eyes, posterior margin subcarinate; shorter side of basal segment of flagellum equal to segment 2, median segments about as broad as long; mandibles slender and simple apically; wings lightly infuscated, not much darker apically, with the usual three submarginal cells, 2nd and 3rd subequal anteriorly, veins testaceous to piceous, stigma somewhat more ferruginous, basal vein interstitial with transverse median; tegulae shining, punctures minute, sparse and obscure; posterior margin of scutellum very slightly impressed medially; front coxae not spinose; apex of hind. tibiae with a row of four rather short but robust, dark bristles; clypeus, lateral face marks, labrum and mandibles except tips, yellow, to some degree tinged with ferruginous, face marks ending narrowly on margin near top of eye, and cheeks very narrowly yellow adjacent to eye margin below; head otherwise, black, antennal scape testaceous, flagellum more brownish-testaceous below, becoming piceous above; pronotal collar, tubercles, tegulae, scutellum, adjacent median area of metanotum, and a rather large anterior maculation on mesopleura, bright yellow; thorax otherwise black, legs reddish-testaceous basally, tibiae yellow in large part, with reddish infusions, tarsi yellow at base, becoming somewhat reddened on apical segments, spurs pale yellow; basal abdominal tergum entirely dark, terga 2-5 with transverse, median, yellow
bands, those on 2 and 3 broad laterally, more or less deeply constricted medially, slightly interrupted on 3, those on 4 and 5 of more uniform width; abdominal sterna largely dark, but 3 and 4 to some degree yellow banded; punctures over entire head quite uniformly, deeply, closely, distinctly and rather coarsely punctate, only the clypeus becoming somewhat more finely and closely punctate medially; scutum densely and rather coarsely rugoso-punctate; punctures of scutellum and of mesopleura below somewhat coarser and more distinct, becoming crowded on pleura above; propodeum dull, densely and finely rugose posteriorly and to some degree on each side, becoming somewhat smoother toward mid coxae, triangle impunctate but densely tessellate and dull, becoming obscurely and finely striate along upper margin; abdominal terga deeply, finely, distinctly and very closely punctate throughout, only the very narrow apical rims impunctate, this somewhat broader on tergum 4 where it is yellowish-hyaline; pseudopygidium transverse, very short, forming the rather narrow, truncate, apical margin of tergum 5, densely covered with suberect, whitish tomentum; pubescence extremely short, thin and obscure, hardly visible, entirely pale where evident, sternum 5 with an apical tuft of elongate, somewhat curved, brownish hairs on each side of mid-line.
MALE—Length 7 mm.; lateral ocelli sub- equally distant from margin of vertex and each other; cheeks somewhat more than half width of eyes, posterior margin subcarinate; antennal scape only slightly swollen, apex deeply excavated and partially enclosing pedicel, shorter side of basal segment of flagellum fully equal to segment 2, median segments fully as broad as long; mandibles slender and simple apically; wings hyaline basally becoming faintly infuscated apically, with the usual three submarginal cells, 2nd only slightly broader than 3rd anteriorly, veins testaceous to piceous, stigma somewhat more reddish, basal vein interstitial with transverse median; tegulae shining, punctures rather fine but deep and distinct, rather sparse except anteriorly; posterior margin of scutellum only faintly impressed; front coxae not spinose; hind femora unmodified; clypeus, labrum, mandibles except tips, the narrow malar space and lateral margins adjacent to clypeus, yellowish; head otherwise black, antennal scape more testaceous anteriorly, flagellum reddish-testaceous beneath, becoming piceous above; punctures rather uniformly deep, distinct, close and rather coarse over entire head, becoming somewhat finer below antennae and over median area of clypeus; scutum densely rugosopunctate, rather finely so laterally, scutellum and mesopleura more coarsely and distinctly punctate, the punctures becoming crowded on pleura above; propodeum somewhat more finely but very densely rugoso-punctate, lateral faces becoming somewhat shining toward mid coxae, triangle impunctate but dull and densely tessellate, obscurely short-striate along upper margin; abdominal terga quite uniformly, deeply, very closely and rather finely punctate throughout, only the very narrow apical rims impunctate, and punctures somewhat coarser and more distinctly separated on the more apical terga; pubescence extremely short, thin and obscure, entirely pale where visible; median length of pygidial plate subequal to basal width, slightly narrowed to the abruptly truncate tip, margins carinate, surface rather coarsely but shallowly rugoso-punctate; abdominal sterna deeply, closely and rather finely punctate, depressed rims rather broad, yellowish-hyaline; sternum 6 rather broadly rounded; apical process of sternum 8 (fig. 104) broadly rounded, fringed with robust, ventrally directed setae; gonocoxites of genital armature (fig. 103) broad at; base, not lobate, gonostyli slender and quite short, sparsely tufted apically, neither produced nor tufted at base beneath.
DISTRIBUTION — Nebraska to New York, south to North Carolina, August to October.
FLOWER RECORDS — Aster. Robertson (1929) records placida also on Boltonia and Solidago.
Reprinted from: Broemeling, D.K. 1988 A Revision of the Nomada Subgenus Nomadita of North America (Hymenoptera: Anthophoridae). The Pan-Pacific Entomologist 64; 330-331
Nomada placida Cresson, 1863. Proc. Ent. Soc. Phil. 2:291-292. Lectotype, fe¬male: "Penn., 2600". Allotype, male, "Penn., 2600". Type Depository, Academy of Natural Sciences of Philadelphia.
Diagnosis: Differs from aquilarum, mutans and snowii by having yellow macu¬lations instead of white. Differs from snowii by the lack of extensive ferruginous markings on the mesopleuron and legs and by having medially interrupted transverse maculations on at least one abdominal tergum. Differs from timberlakei and vere-cunda by the presence of one or more medially interrupted maculations on the ab¬dominal terga and by the absence of maculations on the first tergum.
Male: Length 7.4-7.7 mm, forewing length 5.2-5.5 mm, hindwing length 4.0-4.3 mm; does not differ significantly from female.
Female: Length 5.9-7.9 mm, forewing length 4.7-5.4 mm, hindwing length 3.7-4.1 mm; scape moderately punctate; IOD 0.33 mm, OOD 0.35 mm, MLOD 0.13 mm, MOD 0.17 mm, MOOM 0.48 mm; occipital margin sharply angulate; labrum with 5 distinct teeth in transverse subapical row; acetabular carina nearly absent; pre-lobar carina strong; pronotal ridge with sharply angulate anterior margin, de¬pressed medially, deep, large punctures; scutal punctures often reticulate; tegulae punctate anteriorly, nearly impunctate posteriorly, IPS glassy; scutellum faintly bilo-bate; supraspiracular ridge angulate; hypoepimeral area not strongly protruberant; metapleuron with dense, even punctation; pro-coxae with weak spine rudiment; hind tibial apex with 5 heavy, dark bristles in a staggered row; forewing with 3 sub-marginal cells: COLOR: clypeus (except basally), sides of face extending upwards along compound eye to vertex, pronotal ridge and lobes, traces on tegulae, scutel¬lum, metanotum, small anterior mesopleural triangle, tibiae dorsally, apex of hind coxa, abdomen as in illustration, yellow; supraclypeal area, antennae, base of clyp¬eus, tegulae, legs, light brown; remainder of body black.
Discussion: This species appears to be restricted to the eastern half of the country. Its range does not overlap with any other yellow maculated species. Its closest rela¬tive would seem to be N. verecunda, but in structure and patterning it bears a strong resemblance to N. aquilarum.