Extracted from Taxonomy of Five Nearctic Subgenera of Coeliozys (Hymenoptera: Megachilidae) by Baker, J.R. (1975).
Coelioxys hirsutissima Cockerell, 1912, Can. Entomol. 44:168469 ( $ , CaliforŽnia, key, type in the American MuŽseum of Natural History).
FEMALE. Agrees with description and figures of Coelioxys sodalis except as follows: (1) Length 9-12 mm; (2) inŽtegument black; antenna, venter of meta-soma black to piceous; mandible piceous to rufous; legs, tegula, subapical portion of 6th tergum piceous to ferruginous; (3) pubescence white, white to pale ochreous on mesosoma, golden on tarsi; (4) ocular hairs medium length (about 0.8 mm); (5) clypeus visible to almost hidden by short, appresscd setae; slightly convex, margin, with 3-5 small denticles; (14) hypostomal area of gena with setae shorter than those on rest of gena; (16) scutum closely punctured anteriorly and laterally, rest moderately to closely punctured; erect setae inconspicuous, about 0.2 mm long; (20) some metanotal setae apprcssed mediŽally; (22) terga 1-5 with apical fasciae as or less conspicuous than shown in Figure 21; (23) sternum 6 with portion distal to constriction 2/3-1/2 as long as shown in Figure 45E.
MALE. Agrees with description and figures of Coelioxys sodalis except as folŽlows: (24) Length 840 mm; (25) inŽtegument as in female (2 above); (28) clypeus hidden by setae about 0.45 mm long, margin as in female (5 above); (30) paraocular area hidden by setae up to 0.45 mm long; (31) rest of face almost hidden by setae up to 0.45 mm long; (35) vertex moderately punctured; (37) excavation of hypostomal area of gena covered anteriorly or completely by setae shorter than those on gena; (39) scutum as in female (16 above); (40) lateral surface of mesepister-num with setae about 0.35 mm long; (45) terga 1-5 with fasciae as in female (22 above); (47) margin of sternum 4, sterŽnum 5 as in Fig. 26B; sternum 6 as in Fig. 46B, apical margin rounder (as in Fig. 46F); gonocoxites blunter than shown in Fig. 46D, gonobase simple (Fig. 46E). DISTRIBUTION AND SEASON OF FLIGHT. This bee ranges from northern California southeastward into Texas (Fig. 48) and is in flight at least from March 15 (Texas) to July 16 (California).
HABITAT. Coelioxys hirsutissima ranges from areas classified as mixed conifŽerous forest (Abies, Finns, Pseudotsuga), red fir forest (Abies), and oak-juniper woodland (Quercus, Juitiperus) to areas classified as chaparral (Adenostoma, Arc-tostaphyllos, Ceanothus), and coastal sageŽbrush (Salvia, Eriogomim) and into areas classified as California steppe (Stipa), creosote bush-bur sage (Larrea, Franserta), grama-tobosa prairie and shrubsteppe (Bouteloua. Hilaria, Larrea), sagebush steppe (Artemisia, Agropyron), and trans-Pecos shrub savana (Flourensia, Larrea, also with funiperus).
COMPARATIVE COMMENTS. Coelioxys hirsutissima resembles C. sodalis and C. immaculata closely, but females differ from C. sodalis by shorter ocular hairs and brighter coloration of the legs and from C. immaculata by the flat or
slightly rounded clypeus (slightly raised in C. immaculate). Males of C. hirsutisŽsima differ from males of C. sodalis by shorter ocular hairs and brighter colorŽation of the legs and from males of im-macttlata by pubescence on the excavation of the hypostomal area of the gena (alŽmost bare in C. immaculata').
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