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Perdita missionis Timberlake, 1958
Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Perdita
Subgenus: Perdita


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Identification
Extracted from: Timberlake P.H., (1958). A Revisional Study of The Bees of the Genus Perdita F. Smith, with Special Reference to the Fauna of the Pacific Coast (Hymenoptera, Apoidea) Part III. University of Caifornia Press Berkeley and Los Angeles 1958, Volume 14, No. 5, pp. 303-410, plates 4-15.

In 1929 I recorded and described a male specimen of Perdita that differed apparently only in minor details from sexmaculata, which at that time was known to me only by description. Later, after receiving specimens of sexmaculata from Cockerell I discovered that the genitalia of this specimen from Mission, Texas, of which I had drawn a figure, were appreciably different from the same parts in specimens from New Mexico. Recently I have checked additional material and am able to distinguish the new species missionis from localities in the Rio Grande Valley as far west as Sanderson in Terrell County, north to Mason County, and south in Mexico to San Luis Potosi. I am unable to discover any characters to separate sexmaculata and missionis except in the male terminalia, and the difference in the number of joints in the maxillary palpi as brought out in the key. The latter character is unfortunately difficult to see as the mouth parts are retracted in most cabinet specimens. Consequently comparatively few of the specimens of both species were checked for this character, but it presumably holds good. The range of the two species probably overlaps considerably in certain parts of Texas, but as yet the occurrence of the two together has been verified at only three stations, namely, 36 miles south of Sonora, presumably in Edwards County, 15 miles southeast of Dryden, Terrell County, and at Sanderson, Terrell County. Of two females from San Ygnacio, one is missionis and the other is sexmaculata by the palpal character.

The principal differences in the male genitalia are given in the preceding key, and are shown perhaps more intelligibly in the figures. It might be considered that the differences are only of subspecific value, but no intergradation has been observed in the mixed populations noted above.


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