|
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.
This interesting species from Utah is related to oregonensis in the grooved flanks of the pronotum and characters of the male genitalia, but it has the mesonotum more distinctly tessellate than usual in this group.
Female.—Head and thorax dark green, with the mesonotum more yellowish green. Mandibles except tips, labrum, clypeus, lateral and supraclypeal marks yellow; lateral marks subtriangular and ending rather bluntly against lower end of the foveae; subantennal plates black, sometimes with a small yellow spot adjacent to the antennal sockets. Pronotum yellow, with a large green mark, pointed above, down the middle of the flanks. Abdomen yellow, with four blackish bands situated at junction of tergites 1-2 to 4-5, the first one as broad as the yellow band on tergite 2, the following ones successively more narrowed, the fourth mainly restricted to base of tergite 5; basal declivity of tergite 1 with a black line in the median crease and a black spot or mark on each side, the marks sometimes confluent to form a crossband, with the resultant yellow band broad and slightly interrupted. Legs yellow, except the front coxae. Antennae yellow, the pedicel and flagellum dark brown above. Tegulae yellow at base and hyaline on outer margin. Wings whitish hyaline, the nervures whitish, with subcosta and margins of stigma pale testaceous brown.
Head slightly broader than long. Facial foveae rather small, but well impressed, reaching from upper level of antennal sockets not more than halfway to level of anterior ocellus. Mandibles moderately dilated on inner margin and abruptly narrowed close to apex, without formation of an inner tooth. Flanks of .pronotum strongly grooved. Pygidial plate as long as broad at base, ogival and notched at apex. Proboscis rather short, the galeae not quite equaling the stipites. Frons and vertex tessellate but rather shiny, the lower two thirds of the frons rather closely and finely punctured. Thorax tessellate, but shining, the mesonotum having the tessellation delicate and the puncturation fine and unusually close for this group. Pubescence white, the hairs rather close-set, short, erect, and finely mosslike on the mesonotum and considerably longer on the metanotum and pleura. Length, about 5-5.5 mm.; anterior wing, 4.5-4.9 mm.
Male.—Head and thorax dark yellowish green, the propodeum more blackish. Somewhat more than lower half of the face and nearly the anterior half of underside of head bright yellow; yellow of face almost if not quite enclosing antennal sockets, but not proceeding higher than upper level of sockets in median line; proboscis and mandibles, except the slender red tips, yellow. Prothorax, including the sternum and flanks of pronotum almost all yellow, but the disk of pronotum with two dark spots or a narrow crossband. Mesosternum with a rather large yellow mark on each side of the anterior border. Abdomen yellow, with five black bands, including one at base of tergite 1, the yellow band on tergite 1 interrupted and the dark band at base of tergite 5 narrow or evanescent. Legs and antennae yellow, the firBt four or five joints of the flagellum narrowly pale brown above. Tegulae and wings as in female.
Head distinctly broader than long, the cheeks broader than usual in this group, and widest opposite the end of anterior third of the eyes. Mandibles elongate, each reaching almost to base of the other, slightly dilated within at middle, then tapering into a long slender apical part. Facial foveae faint, about twice as long as wide. Flanks of pronotum deeply grooved, the groove bounded anteriorly by a curved ridge proceeding from middle of the anterior margin of the flank to middle of side margins of the disk. Sculpture and pubescence nearly as in female, but the frons dull, obscurely punctured, and mesoscutum generally somewhat dullish from the tessellation. Subgenital plate about twice as long as wide and truncate at apex. Mediodorsal lobes of caulis short and truncate at apex; ventral part of parameral lobes broad and well exposed in dorsal view; body of sagittae rather short and broad, widest at the preapical angulation and subacute at apex. Length, 4-4.5 mm.; anterior wing, about 3.2-3.4 mm.
|
