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| Links | Identification Summary: Females are very large; black pronotal collar; pits on the scutum are large; T1 can have some amber at the very base or can be completely black; appears most commonly along the coast, particularly near salt marshes
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© Copyright source/photographer
· 5
Hylaeus schwarzii, F, Back, MD, Dorchester County |
© Copyright source/photographer
· 5
Hylaeus schwarzii, F, Face, MD, Dorchester County |
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© Copyright source/photographer
· 5
Hylaeus schwarzii, F, Side, MD, Dorchester County |
Mitchell, Bees of the Eastern United States, Vol. I, 1960 · 1
Hylaeus schwarzii, figure11b |
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Mitchell, Bees of the Eastern United States, Vol. I, 1960 · 1
Hylaeus schwarzii, figure12i |
Mitchell, Bees of the Eastern United States, Vol. I, 1960 · 1
Hylaeus schwarzii, figure14e |
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John B. Pascarella · 1
Hylaeus schwarzii, female, abd top close |
John B. Pascarella · 1
Hylaeus schwarzii, female, abd top |
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John B. Pascarella · 1
Hylaeus schwarzii, female, face |
John B. Pascarella · 1
Hylaeus schwarzii, female, face2 |
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John B. Pascarella · 1
Hylaeus schwarzii, female, face3 |
John B. Pascarella · 1
Hylaeus schwarzii, female, mandibles |
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John B. Pascarella · 1
Hylaeus schwarzii, female, side |
John B. Pascarella · 1
Hylaeus schwarzii, female, top |
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Overview |
Reprinted with permission from: Mitchell, T.B. 1960 Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 141.
FEMALE—Length 6.5-8.0 mm.; black, antennae blackish above, more piceous beneath; face marks pale yellow or ivory, filling area between clypeus and eyes below, but diverging from clypeus above, constricted to the truncate tip just at level of antennae; collar entirely black; tubercles each with a small yellowish maculation; tegulae piceous, not maculated; wings hyaline at base, but becoming quite deeply infuscated over apical half, veins and stigma piceous; legs black, but front tibiae ferruginous anteriorly, mid tibiae with a small basal ivory spot, basal third or more of hind tibiae ivory; face somewhat narrowed below; cheeks slightly narrower than eyes; inner orbits quite strongly elevated above level of eye margin; foveae deep and distinct, separated from eye by a slightly wider space, slightly divergent from eye above; scape slender, 2nd and 3rd segments of flagellum short, broader than long, the others about as long as broad; front coxae simple; dorsal area of propodeum sloping, about equal in length to metanotum, very coarsely reticulate, posterior and lateral surfaces very finely rugose and covered with thin silvery tomentum, margin of posterior face not conspicuously carinate; metanotum relatively smooth, dull and tessellate, impunctate; punctures of lower face sparse, shallow and obscure, area above antennae closely punctate or subrugose, becoming rather sparse on vertex; punctures of scutum and scutellum deep and distinct, close but not crowded, those on pleura below very coarse and distinct, well separated but not sparse, becoming subrugose above; abdomen impunctate, basal segment shining.
MALE—Length 7.0-7.5 mm.; black; antennae black above, brownish-ferruginous beneath, scape entirely black; mandibles and labrum black; collar and tegulae entirely black; wings deeply infuscated apically, becoming hyaline at base, veins and stigma fuscous; maculations pale yellow or ivory, as follows: clypeus, sometimes black in part above, supraclypeal area variable, lateral face marks protruding above antennae rather narrowly along eye margin and truncate at apex, tubercles with a very small spot, basal third of hind tibiae and hind basitarsi except tip; mid basitarsi somewhat whitened at base; front tibiae ferruginous anteriorly; legs otherwise black; face narrowed below; cheeks narrower than eyes in lateral view; scape rather robust, slightly curved, apex slightly broader than flagellum; 1st and 2nd segments of flagellum subequal, about as long as broad, following segments slightly longer; front coxae simple; dorsal area of propodeum sloping, about equal in length to metanotum, coarsely reticulate, posterior and lateral surfaces also coarsely reticulate, a sharp carina on each side delimiting these surfaces, the carina interrupted medially by a deep cavity; metanotum more finely but very densely rugose; punctures of scutum rather fine and densely crowded over most of disc, those of scutellum somewhat more coarse and distinctly separated, although close, pleural punctures very coarse and well separated below, becoming somewhat finer and densely crowded or rugose above; punctures of abdomen very fine but quite deep and distinct, sparse on the shining basal segment, close on the others; 3rd and 4th abdominal sterna each with a shining, impunctate, basal, median elevation, that on the 4th usually hidden beneath the apical portion of the 3rd sternum.
DISTRIBUTION — Massachusetts to Florida; April to September in the North, to December in Florida.
FLOWER RECORDS—Hydrocotyle umbellata, Medicago lupulina, Melilotus alba, Sagittaria and Salix.
Schwarzi is very closely related to nelumbonis, although the red base of the abdomen in nelumbonis will readily separate them. In addition, the metanotum in the female of nelumbonis is very short and fiat, and is densely and finely rugose. In schwarzi the metanotum is longer, more convex and quite smooth, although dull and tessellate. In the males, the basal elevations of the 3rd and 4th abdominal sterna are poorly developed or completely absent in nelumbonis.
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Identification | |
In addition to the characters scored in this guide, H. schwarzi also has an impunctate, but quite uneven clypeal surface that is finely roughened. Also the pits on the upper half of the scutum are shallow, not terribly distinct, especially in comparison to many other species, H. annulatus for example.
When double checking your H. schwarzii identification, check to see if your bee is hairy - at least for a Hylaeus. H. schwarzii females are not wholey unique, but are distinct in having a dense covering of almost fur like white hair on the sides of the pronotum and on the sides of the propodeum. Also, the pronotal lobes should have quite a bit of longish, white hair on them. Some other species share this hairy nature, but this is the only Eastern species that combines it with nearly impunctate clypeal and paroccular areas.
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Updated: 2024-04-26 00:31:10 gmt
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