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Perdita rehni Cockerell, 1907
Perdita (Perdita) rehni extensa Timberlake, 1962, valid subspecies; Perdita (Perdita) rehni praeclara Timberlake, 1968, valid subspecies

Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Perdita
Subgenus: Perdita


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Identification
Extracted from: Timberlake P.H., (1962). 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 V. University of California Publications in Entomology Editors, Volume 28, No. 1, pp. 1-124.

P. rehni is an anomalous species, for although it is undoubtedly allied to dasy-lirii and rhois it is very distinctive in both sexes. The face marks of the female are restricted to small L-shaped marks, with a narrow line on the orbits and a short thick anterior arm. In extreme macrocephalous male specimens the cheeks arevery broad and armed with a large anterior process, the mandibles are extremely long, with each reaching slightly beyond the base of the other, and the flanks of the pronotum are extraordinarily excavated on the posterior side, with the dorsal disk becoming longer than wide and narrowed toward the broad collar. The genitalia (figs. 789 and 790) are very peculiar and distinctive. The type locality of rehni is Alamogordo, New Mexico, where it was taken by Viereck, June 6-9,1902, at flowers of Dasylirion wheeleri.

Female,—Head and thorax dark green; labrum, clypeus, and supraclypeal area, brown to blackish. Basal half of mandibles, narrow orbital line to middle or a little above middle of eyes, oblique or often rectangular short arm to sides of clypeus, and sometimes a narrow band across dorsal border of clypeus including more rarely entire lateral extensions of clypeus, yellowish white. Apex of mandibles reddened. Collar of pronotum and its hind border from tubercule to tubercle, yellowish white. Abdomen fuscous or brownish, with a yellow band, usually enclosed, on tergites 1 to 4, abbreviated on tergite 1, basal on others; venter, lateral margins of tergites 2 to 4, and tergite 5, yellow or testaceous yellow, the pygidial plate rufotestaceous. Legs yellow; sometimes a patch on posterior side of front femora or line on posterior side of front and middle tibiae, apical half of hind femora on dorsal side, and hind tibiae and tarsi, brown or fuscous. Antennae dark brown, scape and pedicel yellowish white beneath, flagellum narrowly brownish yellow beneath. Tegulae pale yellow at base and nearly clear hyaline exteriorly. Wings somewhat whitish hyaline, nervures pale testaceous, margins of stigma and subcosta pale brown.

Head as broad as long. Proboscis moderately long, included within fossa in repose, galeae somewhat shorter than stipites. Mandibles with a small blunt inner tooth. Clypeus large, convex, and strongly rounded above. Facial f oveae linear, about half as wide as interval between them and eyes and reaching from above level of upper margin of antennal sockets about halfway to level of anterior ocellus. Pterostigma large and slightly broader than first submarginal cell; part of marginal cell beneath stigma much longer and considerably narrower than part beyond. Pygidial plate longer than wide at base, with sides converging to acute apex. Head and thorax finely tessellate and dullish, face below antennae more shining; clypeus with sparse minute punctures and mesoscutum with widely separated obscure punctures. Pubescence whitish, short, and thin, but longer, and denser on cheeks, undersurface of head and thorax, and front coxae; somewhat squamiform on mesonotum. Length: 4-5 mm.; anterior wing, 2.9-3.4 mm

Male.—Head and thorax green or blue-green, more shining than in female. Undersurface of head, anterior half of cheeks, proboscis, mandibles except red tips, labrum, face to level of f oveae, prothorax except band across disk of notum, broad middle of mesopectus, and anterior half of mesepisternum, bright yellow. Abdomen yellow, tergite 1 except for enclosed oval or quadrate mark, and moderately broad band at apex of tergites 2 to 4 or 5, brown. Legs yellow; a mark at apex of hind femora above, outer side of hind tibiae, and hind tarsi, brown or fuscous. Antennae yellow, a spot at apex of scape, pedicel, and flagellum narrowly above, brownish, color fading toward apex of flagellum. Tegulae and wings similar to those of female.

Head little wider than long. In extreme macrocephalous examples, cheeks broad and angulate anteriorly, with large conical process; head also more quadrate, with inner orbits diverging anteriorly; and mandibles extremely long, tapering, slender, falcate, each reaching a little beyond base of other. Facial f oveae punctif orm. In small-headed examples, flanks of pronotum moderately impressed and dorsal disk transverse as usual: in extreme macrocephalous specimens pronotum greatly enlarged, as much as three-fourths as long as mesoscutum, disk longer than wide and narrowed nearly one-half toward collar; flanks deeply impressed with fundus beneath posterior margin and surface anterior to impression broadly exposed and roundly ridged close to anterior border. Head and thorax weakly tessellate, shining, and virtually impunctate; seutellum and metanotum duller than other parts. Pubescence whitish: moderately abundant on underparts of head and thorax; face nude; vertex, cheeks, and mesonotum with short sparse hair, becoming slightly coarser on scutum. Tergite 7 with a pygidium-like median lobe slightly longer than wide and distinctly notched at apex. Subgenital plate about twice as long as wide, widest just before middle and thence narrowing to blunt apex. Dorsal lobes of caulis strap-shaped, rounded at apex,curved outward, reaching near end of basal fourth, of parameral lobes, and not fimbriate beneath; parameral lobes a little longer than caulis, appearing slender and acute in dorsal view and strap-like and angulated in lateral view; volsellae mainly beneath dorsal lobes as seen from above, superior pair small and inferior pair broad and broadly notched at apex as seen from side; sagittae large, stout, fused at middle, expanding on apical part, and dividing into a forci-pate structure as seen from above, with inner angles of forceps very sharp, and as seen from side ovally and thickly fusiform, but narrowed at apex. Length.: about 3-4 mm.; anterior wing, 2.4r-2.9 mm.

Perdita rein extensa n. subsp. Extracted from: Timberlake P.H., (1962). 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 V. University of California Publications in Entomology Editors, Volume 28, No. 1, pp. 1-124.

Female.—Like typical rehni except for more extensive markings of face. Lateral marks, labrum, clypeus except two abbreviated dark stripes on disk, and two spots or transverse mark on supraclypeal area, pale yellow, or yellowish white. Yellow bands of abdomen broad and not enclosed, except on tergite 2, but light mark on tergite 1 more or less small and roundish, or sometimes divided by a dark line in median crease. Length: 4-4.5 mm.; anterior wing, 2.9-3.2 mm.

Male.—Not appreciably different from typical rehni. Length: 3-3.5 mm.; anterior wing, 2.4r-2.8 mm.


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Updated: 2024-03-28 22:21:35 gmt
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