Extracted from: Grigarick A.A., & Stange L.A., (1968). The Pollen Collecting Bees of the Anthidiini of California (Hymenoptera: Megachilidae) Bulletin of the California Insect Survey Volume 9.
Heteranthidium bequaerti Schwarz, 1926. Amer. Mus. Novi-tates, 218:6-7.
Holotype 9, Redondo, California (AMNH), Geographic range.—Southern California, Colorado Desert. California records.—IMPERIAL Co.: Coyote Wells, 4.S mi. E, 1 6, VI-10-56 (R. Snelling, SS). RIVERSIDE Co.: Indio, 20 mi. E, 17 S, 3 2, VI-21-58 (C. MaeNeill, CAS). Palm Springs, 1 3, V-3-39 (SS); 1 $, V-24-34, on Dalea (T. Laningham, SS); 1 $, VI-12-54 (J. Hall, UCD); 22 5,3 5, VI-24-52, on Dalea spinosa (P. Timberlake, CIS); 30 £, 14 2, VI-25 to 28—41, on smoke bush flowers (E. Van Dyke, CAS); 3 mi. S, 1
The markings of the face and abdomen of this species are cream but the remainder of the macula-tions are pale yellow on a black background. The metasomal bands are slightly V-shaped, angling posteriorly. Color patterns vary somewhat in extent and may be present or absent on such structures as the scutellum of the males. The females of bequaerti are readily separated from the other species of Heteranthidium in California by a prominent median pro-jection of the apical margin of the fifth tergum (fig. 113). This projection is present but not as prominent on the males. The wide median projection of tergum VII and concave tergum VI distinguish the males from the other species.
H. bequaerti is infrequently collected, but long series are generally taken when they are found in association with flowers of Dalea spinosa, the smoke tree. One hundred and ten males and 39 females were recorded, all within 40 miles of Palm Springs except a male from Imperial Co., four females from San Bernardino Co. and the type from Redonde. The type label shows the locality ending in an e, but Schwarz listed it as Redondo.
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