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Hylaeus calvus (Metz, 1911)
Prosopis calvus Metz, 1911

Life   Insecta   Hymenoptera   Apoidea   Colletidae   Hylaeus
Subgenus: Paraprosopis


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Overview
Reprinted from: Snelling, R. 1970. STUDIES ON NORTH AMERICAN BEES OF THE GENUS HYLAEUS. 5. THE SUBGENERA HYLAEUS. S. STR. AND PARAPROSOPIS (HYMENOPTERA: COLLETIDAE) Contributions in Science, No. 180.

This common species ranges from southern Oregon to northern Baja California. A disjunct population exists in north central Arizona. In California H. calvus occurs through much of the Upper Sonoran area, along the coast ranges and the eastern foothills of the Sierra Nevada. Although in flight from early April until the middle of July it is most abundant during May and June. The females are often taken in large numbers at flowers of various chaparral shrubs such as Rhamnus, Eriodictyon, Rhus and Ceanothus.

The following are the marginal localities known to me for H. calvus: MEXICO. Baja California del Norte: 1 ~,Encinas, 4 mi. S., Sierra San Pedro Martir, VI-2-1958 (1. Powell; CIS). UNITED STATES. Oregon: 2 g g, Griffin Creek, Jackson Co., VI-6-1957 (C. Fitch; UCD). Nevada: 1 g, 1 ~, Verdi, Washoe Co., VI-25-1961 (F. D. Parker; UCD). Arizona: 1 g, Parker Creek, Sierra Ancha, V-4-1947 (H. and M. Townes); 4 g g, 1 ~,Oak Creek Canyon, Coconino Co., V-16-1947 (H. and M. Townes); 1 g, same locality and collectors, V-19-1947; 1 g, 2 ~ ~, same locality and collectors, V-20-1947; 1 ~,same locality, VI-26-1950 (L. D. Beamer; all UK).

This is one of the least variable of our species of Paraprosopis and one of the most easily recognized. In the female the combination of maculate clypeus, angularly produced laterobasal angle of the anterior coxae, shining, sparsely punctate mesopleurae and sparsely punctate abdomen are diagnostic. Typical males may be recognized by the lateral face marks truncate at the level of the antennal sockets, the finely, sparsely punctate shining mesopleurae and dull, densely tesselate abdomen. Males of this species, as well as those of H. nevadensis and H. polifolii, may have the clypeal borders broadly infuscated and the lateral face marks strongly narrowed above, ending acutely on the eye margin. Such males of this species may be recognized by the shining mesopleurae and dull abdomen with the punctures obscured by the dense tesselation.


Names
Scientific source:

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FamilyScientific name @ source (records)
Asteraceae  Baccharis pilularis @ AMNH_BEE (2)

Gutierrezia microcephala @ UCRC_ENT (1)
Boraginaceae  Eriodictyon trichocalyx @ UCRC_ENT (1)

Eriodictyon @ AMNH_BEE (50)
Hydrophyllaceae  Eriodictyon sp @ BBSL (5)
Liliaceae  Calochortus sp @ BBSL (1)
Malvaceae  Fremontodendron californicum @ UCRC_ENT (1)
Onagraceae  Clarkia sp @ BBSL (1)

Clarkia @ AMNH_BEE (3)
Rhamnaceae  Ceanothus cordulatus @ UCRC_ENT (32)

Ceanothus integerrimus @ UCRC_ENT (4)

Ceanothus @ AMNH_BEE (2); UCRC_ENT (1)

Rhamnus californica @ BBSL (2); UCRC_ENT (160)

Rhamnus crocea @ UCRC_ENT (2)

Rhamnus ilicifolia @ UCRC_ENT (2)
Salicaceae  Salix laevigata @ UCRC_ENT (1)
_  Withheld @ BBSL__YOSE (19); BBSL (96); BBSL__PINN (10)

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Updated: 2024-06-14 18:08:11 gmt
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