Metallic forms of Nomia (Mdlitidia) of New Guinea in the collection of Bishop Museum (Hymenoptera, Halictidae)

概要

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This paper has been prepared primarily to describe new species of the subgenus Mellitidia, which is one of the most interesting subgenera of the genus Nomia, although it concerns only the metallic forms of that subgenus. Previously four metallic species of Mellitidia, namely, longicornis Smith, metallica Smith, gressitti Michener and simplicinotum Michener, have been known from the Austro-Papuan Region. In this paper, seven more species will be described as new, and the male of simplicinotum will newly be described. The subgenus Mellitidia Guerin-Meneville is composed of medium-sized Nomia bees which, either black or metallic, are characterized in having the malar area being at least one-half as long as the basal width of the mandible and the metanotum armed with a median projection (although sometimes weak). The females are further distinct in having the mandibles being tridentate and the inner spurs of the hind tibia pectinate because of the presence of two or rarely three large projections. So far as the elongate malar area is concerned, Mellitidia is most closely related to the subgenus Ptilonomia Michener, but is easily separable from the latter in the absence of the darkening along the costa of the hind wing beyond the hamuli. The subgenus has not been found outside the Austro-Papuan Region.
九州大学の論文
1967-03-30