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 is similar to arenaria but differs in having the thorax dark except small marks on pronotum and tubercles, the femora and hind tibiae marked with black, and the black spots of abdomen larger. In the key to the species of Heteroperdita (Univ. Calif. Publ. Bntom., 9:366) the female goes to bellula and the male runs out at couplet 10, and is easily distinguished by the creamy-white abdomen with dark spots.
Female.—Head and thorax very dark green, the disk of mesoscutum blackish. Mandibles except reddish tips, labrum, clypeus except pair of black dots, transverse lateral marks, and supraclypeal mark yellowish white. Thorax entirely dark except narrow mark on posterior corners of disk of pronotum and the tubercles, which are white. Abdomen creamy white, tinged slightly with flesh color, especially toward the apex; tergites 1 to 5 each with a round black spot on each side subapically, those on tergite 2 larger than the others and those on tergite 5 much smaller and transverse; tergite 1 with two large spots at summit of basal declivity in alignment with preceding marks, and the median crease of base also black; tergites 2 to 5 each with mediobasal mark, angulate behind and a little larger than the sublateral spots; tergites 3 and 4 each with a small round spot at basal corners, and tergite 2 having the lateral foveae black and sometimes also the lateral margins broadly, or the black at base restricted to usual median and lateral marks. Legs pale yellowish, the front and hind coxae except at apex, blotchon dorsal margin and anterior side of front and middle femora, dorsal margin of hind femora and small suffused blotch on outer side of hind tibiae fuscous or black. Flagellum of antennae pale brown above, narrowly dark at the articulations, especially toward base and pale dull yellow beneath, the pedicel and scape clear pale yellow. Tegulae pale yellowish hyaline, with a whitish basal mark. Wings hyaline, the nervures and margins of stigma pale brown.
Structural characters and sculpture as in arenaria, the pubescence white, rather dense and appressed, with a nude area on f rons and on each side of disk of mesoscutum, and the postgenae, prosternum, and front coxae provided as also in arenaria with much longer fine hairs, those on the postgenae extending obliquely inward and backward. Length, about 3.5 mm.; anterior wing, 2 mm.
Male.—Similar to female in color and markings, tergite 6 with small transverse sublateral spots like those on tergite 5, but the mediobasal spot may be present or absent; laterobasal marks present on tergites 2 and 3, and sometimes the basal margin of tergite 2 black or with a small spot on each side in alignment with the other sublateral spots; mediobasal mark on tergite 2 sometimes small or faint and that on tergite 4 always largest, these median marks sometimes much larger than any of the others except the two at summit of basal declivity on tergite 1. Antennae brown, the flagellum much beneath, the scape clear pale yellow.
In structural characters including sculpture and pubescence similar to the male of arenaria. Subgenital plate similar to that of arenaria, with the apical quadrate part not quite twice as long as wide, with sides of basal half reflexed, the disk with extremely fine short setae which leave only a small part of the apical half nude (a large nude area on apical half in arenaria, but the oval clear area shown in fig. 135 does not show in one preparation and is possibly an artifact). Aedeagus too similar to that of arenaria to offer good distinguishing characters. Length, about 2.5 mm.; anterior wing, 2 mm.