The Megachilidae of Southern Maine
Psyche: A Journal of Entomology
TIlE value of the older collections of bees, which usually consist of specimens bearing only localitylabels, is greatly impaired by the absence of flower-records; and they require to be supplemented by later and more carefully collected material. It is hardly worth while to-day to make a large collection of bees without placing on record for each specimen the name of the plant species upon which it was captured, the date of visit, and the locality. It is also desirable to observe whether the
... erve whether the insect is sucking honey or gathering pollen. As bees are chiefly dependent upon nectar for food and upon pollen for brood-rearing they are of necessity constant and diligent visitors of flowers. Monotropic and oligotropic bees confine their visits to one or a few species of plants, while in the case of polytropic bees the species may fly only a part ,of the season, as with some species of Andrena. Even when the species fly during the entire summer there may be a portion of the time when only one sex is on the wing, as with the females of Bombus and Halictus in spring. It is evident that accurate flower-records will greatly facilitate both the labor of collection and determination. Of the nineteen species of Megachilidae enumerated in this paper none so far as is known to the authors are oligotropic. The species of Osmia have been taken for the most part in May or June, while the species of Megachile and Coelioxys have all been collected later than July 9th. None of the species can be said to be common; and most, as an examination of the flower-records given below will show, are rare. Osmia atriventris and O. melanotricha are most frequently found on he flowers of Rubus strigosus, while Megachile latimanus is usually a visitor of the Compositae. These three species are the most common local forms belonging to this family. OSMIA. OSMIA ATRIVENTRIS Cr. 1864 Osmia atri,entris Cr. 9, Proc. Ent. Soc. Phil. 3: 29. 1903 Osmia atriventris Robt. 9 , Trans. Am. Ent. Soc. 29" 170. The female has been collected on Rubus strigosus and Epilobium angustifo]ium and several other plants from June 16th to July 23rd. Three males were taken on Salix, May 6th and 7th, 1905. This species probably occurs throughout New Eng-.land and the Eastern States; the type locality is Connecticut.