On the North American Species of the Genus Osmia

Cover On the North American Species of the Genus Osmia
On the North American Species of the Genus Osmia
Ezra Townsend Cresson
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Female. — Head rather large, as wide as the thorax, dark purple, densely and finely punctured, thinly clothed with yellowish-white pu- bescence, which is longer on the sides of the face and cheeks, and short and sparse on the clypeus ; anterior margin of the clypeus entire and fringed beneath with fulvous pubescence, the mandibles also clothed with short fulvous pubescence ; antennae short and black. Thorax dark purple, finely and densely punctured, clothed with yellowish- white pubescence whic
...h is paler beneath ; tegulae black, smooth and shining. Wings subhyaline, apical margin faintly clouded. Legs black, with short pale pubescence, tarsi beneath with fulvous pubescence.
Abdomen subglobose, dark purple, slightly tinged with blue, densely, rather finely and confiuently punctured, clothed with short, suberect, pale yellowish pubescence ; on the basal segment and on the sides, the pubescence is rather long and whitish; the posterior margins of the second and three following segments are fringed with whitish pubes- cence, sometimes interrupted on the middle of the second and third segments; on the apical segment the pubescence is short, dense and whitish; beneath, the ventral scopa is rather dense and black.


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