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Nomada snowii Cresson, 1878
Nomada antonita Cockerell, 1909; Nomada (Holonomada) omahaensis Swenk, 1915; Nomada (Callinomada) antonita Cockerell, 1909; Nomada (Nomadita) antonita Cockerell, 1909; Nomada (Nomadita) omahaensis Swenk, 1915; Nomada (Callinomada) snowii Cresson, 1878; Nomada (Nomadita) snowii Cresson, 1878

Life   Insecta   Hymenoptera   Apoidea   Apidae   Nomada
Subgenus: None

Nomada snowii, male, face
Smithsonian Institution, Entomology Department · 9
Nomada snowii, male, face

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Nomada snowii, male, side
Smithsonian Institution, Entomology Department · 9
Nomada snowii, male, side
Nomada snowii, male, top
Smithsonian Institution, Entomology Department · 9
Nomada snowii, male, top

Nomada snowii FEM CFP
© Copyright Laurence Packer 2014 · 7
Nomada snowii FEM CFP
Nomada snowii MALE CFP
© Copyright Laurence Packer 2014 · 7
Nomada snowii MALE CFP
Overview
Reprinted from: Broemeling, D.K. 1988 A Revision of the Nomada Subgenus Nomadita of North America (Hymenoptera: Anthophoridae). The Pan-Pacific Entomologist 64; 331-333


Nomada snowii Cresson, 1878. American Hymenoptera 75. Lectotype, female: "Col. Snow, 2597". Type Depository, Academy of Natural Sciences of Philadelphia.

Nomada antonita Cockerell, 1909. Canadian Entomologist 41:35-36. Holotype,male: "No. 29473, Antonito, Col., 8-5-00". Type Depository, United States Na�tional Museum. NEW SYNONYMY

Nomada (Holonomada) omahaensis Swenk, 1915. University Studies XV: 17. Holotype, male: "Omaha, Nebraska, August 29,1914, on Solidago canadensis L. T. Williams". Type Depository, University of Nebraska, Lincoln.

Diagnosis: Differs from the other species by the rufo-ferruginous coloring on the legs strongly contrasting with the black propodeum. Differs from aquilarum and pla-cida by having uninterrupted medial transverse maculations on the abdominal terga (except tergum 1 which often lacks any light maculation). Differs from placida, tim-berlakei and verecunda by the presence of white rather than yellow maculations.

Male: Length 6.3-11.1 mm, forewing length 4.8-8.4 mm, hindwing length 3.6-6.7 mm; scape moderately punctate, interior and posterior punctation very sparse, inter-punctural surface highly polished; IOD 0.48 mm, OOD 0.43 mm, MLOD 0.18 mm, MOD 0.19 mm, MOOM 0.56 mm; pre-occipital ridge thick, subcarinate; labrum with apical transverse carina, broken into distinct denticles; pre-lobar carina thick�ened, gently sloping to pronotal lobe; pronotal ridge apex sharply angulate; rims of scutal punctures angulate; tegulae sparsely, shallowly punctate, highly polished; scu-tellum slightly depressed medially, glossy; metanotum not flattened or laterally ex�panded medially; propodeum with thick, rounded supra-spiracular ridge, not promi-nent; hypo-spiracular area shiny, sparsely punctate; metapleuron with ventral half densely punctate; pro-coxal spine rudiment present, not prominent; hind tibial apex with single row of light ferruginous bristles; forewing with 3 sub-marginal cells, apex clear to somewhat clouded; pygidium entire with broadly rounded sides and flat�tened apex: COLOR: clypeus, sub-antennal area, ring around eye (broken dor-sally), labrum, basal two-thirds of mandibles, pronotal ridge and lobes, tegulae, first axillary sclerite, scutellum, metanotum, anterior mesopleuron with posteriorly di�rected projection, coxal apices, ventral apical stripe on fore- and mid-femora, exte�rior of mid- and fore-tibiae, broad apical and basal patches on hind tibiae, transverse median band on tergum 2 broadly emarginate anteriorly, slightly narrowed trans�verse median bands on tergum 3-5, broad apical band on tergum 6, rectangle on sternum 1, broad transverse bands on remaining sterna, white; legs, ferruginous; re�mainder of body black.

Female: length 6.5-9.6 m, forewing length 4.9-6.1 mm, hindwing length 3.7-4.6 mm; similar to males except: acetabular carina virtually absent, pro-coxal spine rudi�ments virtually absent, hind tibial apex with 4 heavy bristles and long thin posterior bristle, supra-clypeal area and basal half of clypeus ferruginous, posterior ventral mesopleuron ferruginous, tergum 1 ferruginous with white posterolateral patch, pro�podeum ferruginous.

Discussion: The type of Nomada antonita (except for sexual differences) is virtu�ally indistinguishable from the female lectotype of N. snowii. The characters used by Rodeck to distinguish N. antonita in his revision (1949) are all variable in Nomada. I am therefore placing N. antonita Cockerell in synonymy with N. snowii Cresson. Northern specimens of N. snowii (= omahaensis Swenk) usually have a complete white band on tergum 1, stronger bands on the remaining terga, and a somewhat smaller pro-coxal spine rudiment than typical specimens. Both forms have been col�lected at the same time and place in both Colorado and South Dakota. I feel the two forms represent a clinal variation rather than distinct taxa. There is a specimen from Arriola in Montezuma Co., Colorado which differs from typical N. snowii in having light lemon yellow maculations instead of white to cream-colored markings. There are no apparent structural differences between this specimen and typical N. snowii. In the absence of more specimens of this form it seems unadvisable to recognize it as a separate taxon.


Reprinted from: Cresson, E.T., 1878. Descriptions of new North American Hymenoptera in the collection of the American Entomological Society. Trans. Am. Entomol. Soc.7:75.


Black? opaque, densely and strongly punctured ; middle of face, clypeus. antenna at base and beneath, pleura beneath, two dots on metathorax and flanks, legs and first abdominal segment above and beneath, ferruginous; mark on each side of face, apex of labrum obscurely, spot at base of mandibles, posterior orbits, collar, tubercles, tegula, scuteilums and large mark, notched behind, on pleura, white; second joint of flagellum equal in length with the third; scutellum nearly flat, very faiutly impressed medially; wings slightly dusky, hyaline near tips; line on four anterior femora beneath near tip?, line on all the tibia at base and spot at tips, white; abdomen opaque finely and closely punctured, a dot on each side of first segment near apex, a broad band narrowed medially on segments 2?4, and the fifth segment entirety pale yellowish-white; venter banded with white. Length .34 inch. %.?Marked like the ?, but without any ferruginous color, except on an tenna beneath and on legs; sides of face, clypeus, labrum, mandibles except tips, spot on scape beneath, collar, scuteilums, tubercles, large uotched mark immediately beneath tubercles and tegula, yellowish-white; face silvery; legs ferruginous, the femora more or less black behind, knees and tibia in front yellow, a black spot on four posterior tibia near tips; first segment of abdomen with a narrow yellow band, deeply indented on each side anteriorly and nearly interrupted on the disk, segments 2?6 each with a yellow band, broad on second segment aud narrowed in the middle; venter banded with yellow. Length .35 inch. Hah.?Colorado, (Prof. F. H. Snow 9 ; Morrjson o ). Two speci mens. A very pretty species.

Identification
Diagnosis: Differs from the other species by the rufo-ferruginous coloring on the legs strongly contrasting with the black propodeum. Differs from aquilarum and pla-cida by having uninterrupted medial transverse maculations on the abdominal terga (except tergum 1 which often lacks any light maculation). Differs from placida, tim-berlakei and verecunda by the presence of white rather than yellow maculations.

Male: Length 6.3-11.1 mm, forewing length 4.8-8.4 mm, hindwing length 3.6-6.7 mm; scape moderately punctate, interior and posterior punctation very sparse, inter-punctural surface highly polished; IOD 0.48 mm, OOD 0.43 mm, MLOD 0.18 mm, MOD 0.19 mm, MOOM 0.56 mm; pre-occipital ridge thick, subcarinate; labrum with apical transverse carina, broken into distinct denticles; pre-lobar carina thick�ened, gently sloping to pronotal lobe; pronotal ridge apex sharply angulate; rims of scutal punctures angulate; tegulae sparsely, shallowly punctate, highly polished; scu-tellum slightly depressed medially, glossy; metanotum not flattened or laterally ex-panded medially; propodeum with thick, rounded supra-spiracular ridge, not promi�nent; hypo-spiracular area shiny, sparsely punctate; metapleuron with ventral half densely punctate; pro-coxal spine rudiment present, not prominent; hind tibial apex with single row of light ferruginous bristles; forewing with 3 sub-marginal cells, apex clear to somewhat clouded; pygidium entire with broadly rounded sides and flat�tened apex: COLOR: clypeus, sub-antennal area, ring around eye (broken dor-sally), labrum, basal two-thirds of mandibles, pronotal ridge and lobes, tegulae, first axillary sclerite, scutellum, metanotum, anterior mesopleuron with posteriorly di�rected projection, coxal apices, ventral apical stripe on fore- and mid-femora, exte�rior of mid- and fore-tibiae, broad apical and basal patches on hind tibiae, transverse median band on tergum 2 broadly emarginate anteriorly, slightly narrowed trans�verse median bands on tergum 3-5, broad apical band on tergum 6, rectangle on sternum 1, broad transverse bands on remaining sterna, white; legs, ferruginous; re�mainder of body black.

Female: length 6.5-9.6 m, forewing length 4.9-6.1 mm, hindwing length 3.7-4.6 mm; similar to males except: acetabular carina virtually absent, pro-coxal spine rudi�ments virtually absent, hind tibial apex with 4 heavy bristles and long thin posterior bristle, supra-clypeal area and basal half of clypeus ferruginous, posterior ventral mesopleuron ferruginous, tergum 1 ferruginous with white posterolateral patch, pro�podeum ferruginous.

Discussion: The type of Nomada antonita (except for sexual differences) is virtu�ally indistinguishable from the female lectotype of N. snowii. The characters used by Rodeck to distinguish N. antonita in his revision (1949) are all variable in Nomada. I am therefore placing N. antonita Cockerell in synonymy with N. snowii Cresson. Northern specimens of N. snowii (= omahaensis Swenk) usually have a complete white band on tergum 1, stronger bands on the remaining terga, and a somewhat smaller pro-coxal spine rudiment than typical specimens. Both forms have been col�lected at the same time and place in both Colorado and South Dakota. I feel the two forms represent a clinal variation rather than distinct taxa. There is a specimen from Arriola in Montezuma Co., Colorado which differs from typical N. snowii in having light lemon yellow maculations instead of white to cream-colored markings. There are no apparent structural differences between this specimen and typical N. snowii. In the absence of more specimens of this form it seems unadvisable to recognize it as a separate taxon.


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