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Perdita agasta Timberlake, 1958
Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Perdita
Subgenus: Hexaperdita


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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.

The female of agasta runs to heterothecae in my key to the species of Hexaperdita, but it differs in its larger size, and in having the lateral face marks attenuate above, the upper margin of the clypeus black, the abdomen with a white band on tergites 1 to 4 and the tarsi brown instead of white. It also has some resemblance to blatchleyi and asteris, but differs in the shining and almost polished frons and mesonotum.

Female.—Head and thorax dark blue-green, the clypeus and lateral marks white. Supraclypeal area black, as well as the upper margin of disk of clypeus rather broadly, with the white notching the black in the middle. Lateral marks anteriorly broad and filling space between clypeus and eye, but the orbital extensions slender to level of antennae. Mandibles rufotestaceous, becoming redder at apex and brown at base. Collar of pronotum, narrow marks on posterior corners of disk, and the tubercles white. Abdomen brownish black, the pygidium ferruginous; a narrow, slightly interrupted white band at base of tergites 2 to 4, and a broadly interrupted band at summit of the basal declivity of tergite 1. Antennae fuscous, the Bcape blackish, the flagellum brown beneath. Legs brown, darker toward base, the tarsi pale brown. Tegulae testaceous hyaline, with a dark base. Wings hyaline, with a just perceptible duskiness, the nervures pale testaceous, the subcosta and margins of stigma pale brown.

Head slightly broader than long. Mandibles slender, gently curved and reaching far margin of proboscidial fossa. Proboscis moderately long, the galeae about equaling the stipites and the labial palpi. Facial foveae tear-shaped, pointed below, and reaching from upper level of antennal sockets about halfway to level of anterior ocellus. Pygidial plate not much longer than wide, the slightly rounded apex about half as wide as the base. Head and thorax shining, with a distinct tessellation on the vertex and a weak tessellation around borders of the mesoscutum and the scutellum; punctures of the frons and mesoscutum fine and sparse. Pubescence whitish, rather long, erect, and mosslike, the hair of face much shorter. Scopa of hind tibiae rather thin, but long and finely plumose. Length, 4.75 mm.; anterior wing, 3.5 mm.


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