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Anthidium placitum Cresson, 1879
Anthidium bernardinum Cockerell, 1904; Anthidium hesperium dentipygum Swenk, 1914; Anthidium permaculatum Cockerell, 1925; Anthidium bernardinum var mesaverdense Schwarz, 1927; Anthidium niveumtarsum Schwarz, 1927

Life   Insecta   Hymenoptera   Apoidea   Megachilidae   Anthidium
Subgenus: Anthidium

Anthidium placitum, male, S8 apex post, VG
© Kimberly Huntzinger, 2007 · 2
Anthidium placitum, male, S8 apex post, VG

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Anthidium placitum, male, S8 apex profile, VG
© Kimberly Huntzinger, 2007 · 2
Anthidium placitum, male, S8 apex profile, VG
Anthidium placitum, male, T6, VG
© Kimberly Huntzinger, 2007 · 1
Anthidium placitum, male, T6, VG

Anthidium placitum, male, S6, VG
© Kimberly Huntzinger, 2007 · 1
Anthidium placitum, male, S6, VG
Anthidium placitum, male, S7, VG
© Kimberly Huntzinger, 2007 · 1
Anthidium placitum, male, S7, VG

Anthidium placitum, male, S8, VG
© Kimberly Huntzinger, 2007 · 1
Anthidium placitum, male, S8, VG
Anthidium placitum, female, T6, VG
© Kimberly Huntzinger, 2007 · 1
Anthidium placitum, female, T6, VG
Identification
Extracted from THE POLLEN-COLLECTING BEES OF THE ANTHIDIINI OF CALIFORNIA (Hymenoptera: Megachilidae) by GRIGARICK A., A. (1968).


Anthidium placitum Cresson, 1879. Trans. Amer. Ent Soc., 7:206. Holotype 9, Nevada (ANSP). Anthidium bernardinum Cockerell, 1904. Bull. South. Calif. Acad. Sci., 3:74. Holotype $, Strawberry Valley, California (AMNH). Anthidium hesperium dentipygum Swenk, 1914. Nebr. Univ. Studies, 14:19. Holotype 9, Laramie, Wyoming (UN). NEW SYNONYMY. Anthidium permaculatum Cockerell, 1925. Proc. Calif. Acad. Sci., series 4, 14:349. Holotype 9, Sparta, Baker Co., Oregon (CAS). NEW SYNONYMY. Anthidium bernardinum mesaverdense Schwarz, 1927. Amer. Mus. Novitates, 252:15. Holotype 9, Mesa Verde, Colorado (AMNH). NEW SYNONYMY. Anthidium niveumtarsum Schwarz, 1927. Amer. Mus. Novi¬tates, 252:18, 9, £. Holotype 9, Jackson, Wyoming (AMNH). NEW SYNONYMY. Geographic range.—Arizona, California, Colorado, Idaho, Nevada, New Mexico, Oregon, Utah, Wyoming. California records.—EL DORADO Co.: Fallen Leaf Lake, 1 9, VII-14-15 (E. Van Dyke, CAS). INYO Co.: Lee Flat, 6 9, VIII-29-58 (A. Menke, L. Stange, UCD). Lone Pine, 1 9, V-6-37 (SS). Westgard Pass, 1 9, VI-15-37 (C. Michener, UCR). LAKE CO.: Upper Lake, 1 9, VIII-9-59 (S. Fidel, UCD). LASSEN CO.: Hallelujah Junction, 1 $, VI-27-49 (H. Hunt, UCD). Los ANGELES CO.: Big Pine Camp, 2 S, 2 9, VII-17-27, on Cordylanthus Nevinii (P. Timberlake, UCR). Mt Baldy, 2 $, VIII-22-20, on Cordylanthus rigidus ssp. brevibracteatus (P. Timberlake, UCR). Tanbark Flat, 2 9, VII-16-56 (H. Moffitt, UCD). MODOC CO.: Davis Creek, 1 $, VII-13-22 (C. Fox, CAS). MENDOCINO CO.: Hopland, 1 9, VII-15-37 (S. Fidel, UCD). MONO CO.: Crooked Creek, White Mts., 10,150 ft, 1 8,1 9, VI-26-61 (J. Buckett, UCD). Tom's Place, 1 mi. S, 2 9, VIII-8-62 (A. Menke, L. Stange, UCD). ORANGE CO.: Santiago Canyon, Santa Ana Mts., VII-25-60 (M. Irwin, UCD). PLACER CO.: Carnelian Bay, Lake Tahoe, 1 9,VII-22-57 (R. Bohart, UCD). PLUMAS CO.: Quincy, 4 mi. W, 1 9, VII-6-49 (H. Hunt, UCD). Meadow Valley, 1 6\ VII-4-24 (E. Van Dyke, CAS). RIVERSIDE CO.: Idyllwild, 4 o\ 1 9, VII-29-38 (E. Van Dyke, CAS). Whitewater Canyon, 7 o\ 6 9, IX-11-33, on Cordylanthus filitolius (P. Timberlake, UCR). SAN BERNARDINO CO.: Big Bear Valley, 1 <$, 2 9, VIII-6-33, on Solidago confinis, Cordy¬lanthus Nevinii (P. Timberlake, UCR). Forest Home, 1 $, VI-1-28 (E. Van Dyke, CAS). Mill Creek Canyon, 4 $, 7 9, VIII-11-35, on Cordylanthus Nevinii (P. Timberlake, UCR); 1 9, VIII-2-46, on Monardella (P. Timberlake, UCR); 1 9, VIII-11-35, on Chrysopsis villosa (P. Timberlake, UCR). SAN DIEGO CO.: Mt Palomar, 1 $, 1 9, VI-28-63, on Cryptantha intermedia (P. Hurd, CIS). Warner Springs, 1 $, X-ll-43 (UCR). SANTA BARBARA CO.: Carpinteria, 1 ,5, VIII-21-37 (B. White, SS). SANTA CLARA CO.: Palo Alto, 1 9, VIII-25-15 (P. Stinchfield, CIS). SANTA CRUZ CO.: Highland District 2 $, IX-2-56 (S. Fidel, UCD). SIERRA CO.: Gold Lake, 1 9, VII-19-21 (C. Fox, CAS). Sardine Lakes, 3 9, VII-31-58 (A. Grigarick, UCD). TULARE CO.: Mineral King, 1 9, VII-30-23 (C. Fox, CAS). TUOLUMNE CO.: Dardanelles, 2 9, VII-13-51 (E. Schlinger, UCD). A. placitum is structurally similar to A. edwardsii, since both species have the entire apical margin of the female clypeus emarginate and the clypeus of the males has a slight apical indentation on the midline. The clypeal emargination of the females is not as strong in placitum as in edwardsii, and this feature is more obscure in specimens examined from Nevada. Tergum VII of the males is distinctive since the la-teral lobe is broad in placitum (fig. 46) and spini-form in edwardsii (fig. 49). Similarly, the female ter¬gum VI of these two species provides taxonomic dif¬ferences. In placitum (fig. 78), the posterior mar¬ginal band is prominent as contrasted to the nearly obscure band of edwardsii (fig. 79). A. pallidiclypeum also has the apical margin of the clypeus emarginate, but in this case the emargination is directed distally from the clypeus whereas in placitum it is directed proximally. Also, the female clypeus of placitum is nearly flat, whereas it is more convex in pallidicly¬peum. A. placitum is also confused with mormonum since the male tergum VII (figs. 43, 46) is similar and the coloration comparable. However, the lateral lobe of the tergum VII is narrower in mormonum. A. placitum is one of the largest species in California with well-developed yellow bands on the abdomen. The female clypeus is typically marked with a me-dian dark stripe as in edwardsii. The maculations are somewhat reduced in the Great Basin states. The distribution of placitum appears to be centered in the Great Basin. In California, placitum is found in all the major mountain ranges and Great Basin areas of eastern California. Judging from the known plant associations, Cordylanthus of the Scrophulari-aceae is a favored host, although records are sparse and scattered in five families. Material examined from California included 90 males and 85 females.

Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
Asteraceae  Ericameria nauseosa @ UCRC_ENT (1)

Ericameria @ UCRC_ENT (1)

Gutierrezia californica @ UCRC_ENT (1)

Heterotheca villosa @ UCRC_ENT (1)

Solidago confinis @ UCRC_ENT (1)
Boraginaceae  Eriodictyon crassifolium @ UCRC_ENT (1)

Eriodictyon trichocalyx @ UCRC_ENT (1)

Phacelia heterophylla @ UCRC_ENT (1)
Lamiaceae  Monardella linoides @ UCRC_ENT (3)

Stachys albens @ UCRC_ENT (3)
Loasaceae  Mentzelia laevicaulis @ UCRC_ENT (1)
Orobanchaceae  Cordylanthus nevinii @ UCRC_ENT (41)

Cordylanthus ramosus @ UCRC_ENT (1)

Cordylanthus rigidus @ UCRC_ENT (23)
Polygonaceae  Eriogonum umbellatum @ UCRC_ENT (1)

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Updated: 2018-11-18 06:36:16 gmt
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