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Perdita dimidiata Timberlake, 1962
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.

The male of dimidiata is similar to exilis but is dark above and almost entirely yellow beneath, with the yellow of the head almost reaching the summit of the eyes. The cheeks are armed anteriorly with a small conical process and the under-surf ace of the head is covered with short, dense, plumose, white hair, although the insect is otherwise only slightly hairy. The female is unknown.

Male.—Vertex and occiput of head and dorsum of thorax shining black with a bluish luster; luster most distinct on anterior part of mesoscutum and propodeum, faint on head. Face and undersurface of head almost to level of summit of eyes, bright yellow; black of vertex extending forward about halfway between level of anterior ocellus and foveae, with a very short median lobe (either broad, or small and angular). Small spot on anterior corners of mesoscutum, andprothorax including sternum, yellow; but disk of pronotum black except collar and narrow posterior border. Thorax otherwise yellow beneath and on sides, including flanks of propodeum, except for a dark oblique band with a bluish tinge extending from beneath tegulae to middle coxae. Abdomen yellow, with a broad fuscous band on each segment above, but with lateral margins of tergites 1 to 5 (more broadly on basal corners) and narrow intersegmental bands remaining yellow. Legs yellow; hind tibiae slightly, hind tarsi more strongly, dusky on outer side. Antennae yellow, pedicel and flagellum above pale brown. Mouthparts yellow, apex of mandibles red. Tegulae yellow at base, broadly subhyaline on outer margin. Wings hyaline, nervures pale testaceous, subcosta and margins of stigma brown.

Head moderately enlarged, distinctly broader than long; cheeks broad but receding and armed anteriorly with a small conical process. Lateral plates of face somewhat broader than space between them. Clypeus much broader than high, obtusely dentate on each side of base of labrum, and with lateral extension strongly reflexed and only partly visible in frontal aspect. Occipital concavity shallow but as broad as space between summit of eyes. Facial f oveae ovally punctiform. Mandibles tapering from broad base, acute at apex, and reaching a short distance beyond far margin of proboscidial fossa. Proboscis of moderate length, tip of galeae almost reaching base of stipites. Flanks of pronotum only moderately impressed. Pterostigma about three times as long as wide and not quite as wide as submarginal cells; marginal cell about as long as stigma, part beneath stigma longer than part beyond, which narrows somewhat toward apex. Head and thorax polished and impunctate. Vertex, meso- and metanotum with sparse, short, erect hair; face nude except for a few hairs on margin of disk of clypeus; cheeks with sparse microscopis hairs; undersurface of head with dense, plumose, white hair. Tergite 7 narrowed to a short, rounded, median lobe. Subgenital plate a little longer than wide, sides nearly straight to rounded apex, and apical part of disk more evidently hairy than in some of allied species. Aedeagus somewhat similar to that of cmstini, but dorsal lobes of caulis separated and slightly divergent, blunt at apex in dorsal view but ending acutely as seen from side, and sagittae blunt at opposed tips. Length: 3 mm.; anterior wing, 2.2 mm.


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FamilyScientific name @ source (records)
Polygonaceae  Antigonon sp @ BBSL (2)

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