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Andrena crudeni LaBerge, 1971
Andrena (Nemandrena) crudeni LaBerge, 1971

Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Andrena
Subgenus: Melandrena


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Overview
Reprinted with permission of the Pan-Pacific Entomologist from: LaBerge, W. E. 1971a. A new subgenus of Andrena found in California and Oregon (Hymenoptera: Apoidea). Pan-Pacific Entomologist 47: 47-57.

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Andrena crudeni is almost indistinguishable from A. torulosa except for the fact that A. crudeni lacks completely the pronotal humeral angle and ridge in both sexes.

FEMALE. MEASUREMENTS AND RATIOS. — N = 20; length, 9-12 mm; width, 2.5-4.0 mm; wing length, M = 3.61 ± 0.102 mm; FL/FW, M = = 0.86 ± 0.003; FOVL/FOVW, M = 3.22 ± 0.072.

INTEGUMENTAL COLOR. — As in A. torulosa.

STRUCTURE. — Structure and sculpture of head as in A. torulosa except as follows: maxillary palpus with segmental ratio about 1.0:1.0:0.7:0.7:0.6:0.4; labial palpus with ratio about 1.0:0.6:0.4:0.6. Thoracic and metasomal sculpture and structure as in A. torulosa except pronotum completely lacks humeral angle and dorsoventral ridge, laterally pronotum rather evenly and finely tessellate.

VESTITURE. — As in torulosa but head with vertex and along inner margins compound eyes usually with abundant reddish-brown hairs.

MALE. MEASUREMENTS AND RATIOS. — N = 9; length, 8-10 mm; width, 2.0-2.5 mm; wing length, M = 3.32 ± 0.229 mm; FL/FW, M = 0.80 ± 0.008; FS1/FS2, M = 2.37 ± 0.087.

INTEGUMENTAL COLOR. — As in A. torulosa.

STRUCTURE. — Structure and sculpture of head as in torulosa except as follows: maxillary palpus with segmental ratio about 1.0:1.0:1.0:0.9:0.7:0.6; labial palpus with ratio about 1.0:0.5:0.4:0.4. Thoracic and metasomal structure and sculpturing as in A, torulosa except as follows: pronotum completely lacks humeral angle and dorsoventral ridge, surface finely and regularly tessellate; terminalia as figured: (Figs. 6-10), note apical process gonocoxite longer, less falcate; sternum 7 broader at apex; shape of volsellae; sternum 8 lacking short stout hairs medially.

VESTITURE. — As in A. torulosa.

Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
Boraginaceae  Nemophila menziesii @ UCRC_ENT (1); BMEC_ENT (1)
Hydrophyllaceae  Nemophila sp @ BBSL (21)
Ranunculaceae  Ranunculus @ BMEC_ENT (2)
_  Withheld @ BBSL__YOSE (169); BBSL (49); BBSL__PINN (168)

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Updated: 2024-03-29 08:50:45 gmt
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