Extracted from Taxonomy of Five Nearctic Subgenera of Coeliozys (Hymenoptera: Megachilidae) by Baker, J.R. (1975).
FEMALE. Agrees with description and figures of Coelioxys sodahs except as follows: (1) Length 10-12 mm; (2) in¬tegument black; antenna, legs, tegula, venter of metasoma black to piceous; (3) pubescence white; white to golden on head, mesosoma; golden on tarsi; (4) ocu¬lar hairs medium (0.08 mm long); (5) clypeus with slender, inconspicuous setae; strongly convex; closely punctured, shiny; margin with 3-5 denticles (Fig. 45B); (8) ventral portion of rest of face convex; (9) clypeoantennal distance greater than an-tennocular distance, shorter than inter-antennal distance; (14) hypostomal area of gena with setae subequal or shorter than those on disc; (15) mandible with hump on outer surface (Fig. 45B); (17) lateral surface of the mesepisternum with slender, prostrate setae up to 0.45 mm long; (18) scutellum similar to Figure 45D; (19) axilla as in Figure 37D; (20) metanotum with setae prostrate medially; (22) terga 1-5 with apical fasciae similar to or more conspicuous than those shown in Figure 21; uniformly, closely punctured with smaller punctures than shown in Figure 21; tergum 6 very closely punc¬tured (Fig. 45F); (23) sterna 1 to basal portion of 5 closely, uniformly punctured; most of sternum 5, 6 very closely punc-tured; sternum 6 with subapieal margin
serrate (Fig. 45F, serrations visible in sil¬houette against light source).
MALE. Agrees with description and figures of Coelioxys sodalis except as fol¬lows: (24) Length 9-11 mm; (25-26) in¬tegument, pubescence as in female (2-3 above); (28) margin of clypeus as in fe-male (5 above); (32) clypeoantennal, an-tennocular, interantcnnal distances as in female (9 above); (35) vertex closely punctured; (38) mandible as in female (15 above); (41-42) scutellum, axilla as in female (18-19 above); (45) terga 1-5 with fasciae and punctures as in female (22 above); tergum 6 with dorsal spines curved and sloped medially (Fig. 45H); (47) margin of sternum 4 as in Fig. 390, lacking longitudinal carinae; sternum 6 with shoulders distinct (Fig. 46J); gono-coxites with setae 2/3 length shown in Fig. 46E.
DISTRIBUTION AND SEASON OF FLIGHT. This bee has been collected from May 5 to July 6 in the Pacific coast states (Fig. 49).
HABITAT. Coelioxys serricaudata has been taken from areas classified as mixed conifer forest (Abies, Pinus, Pseudotsuga), Iodgepole pine-subalpine forest (Pinus, Tsciga), ponderosa pine shrub forest, and California mixed evergreen forest (Oucr-ens, Arbutus, Pseudotsuga); areas classi¬fied as open grassland such as fescue-oat-grass (Festuca, Danthonia), fescue-wheat-grass (Agropyron), California steppe (Stipa), tule marshes (Scirpus, Typha), and alpine meadows and barrens (Agro-stis, Carex, Festuca, Poa).
COMPARATIVE COMMENTS. Females of Coelioxys serricaudata are slender, dark bees which resemble C. moesta, but differ from all other North American Coelioxys by the strongly con¬vex clypeus and serrated margin of the sixth metasoma! sternum (Fig. 45F). Males of C. serricaudata are darker than most Coelioxys males and differ from all
other North American Coelioxys by the dorsal spines of the sixth metasomal ter-gum which are strongly curved and sloped medially.
TYPES, Holotype female, Hastings Nat. Hist. Reservation, Santa Lucia Mts„ Jamcsburg, Monterrey Co., California, 1900-2700 ft., June 12, 1938 (C. D. Mich-encr), deposited in Snow Entomological Museum, the University of Kansas. Para-types females, one, Prospect, Oregon, June 20, 1924 (C. L. Fox); one, Antelope Mt. L. O., Grant Co., Oregon, El. 6500 ft., August 7, 1941 (M. & R. E. Rieder); one, Corvallis, Oregon, July 1, 1910 (J. C. Brid-well); one, Palouse, Washington, June 26, 1961 (R. W. Dawson); the remaining paratypes are from California; one, Tan-bark Flat, Los Angeles Co., June 20, 1956
(R. C. Bechtel); one, Twaine-Harte, Tuolumne Co., 4000 ft., July 1937, Grin-delia sp. (F. E. Blaisdell); one, Chile Bar, Eldorado Co., July 5, 1948 (C. Chan); Redwood City, San Mateo Co., June 10, 1961 (P. H. Arnaud, Jr.); one, 16 mi. E. Glenville, Kern Co., June 25, 1961 (R. L. Macdonald); one, Mormon Bar, 2 mi. S., Mariposa Co., June 16, 1959 (G. I. Stage); one, Miguel Meadows, Yosemite National Park, Elcv. 5200, July 6, 1940 (E. G. Linsley); one, Pine Flat, Tulare Co., June 14, 1961 (G. I. Stage, R. R. Snelling); one, Ryan Creek, Mendocino Co., June 27, 1954, Godetia amoena (P. D. Hurd); one, Nipinnawasee, Madera Co., July 4, 1960 (G. I. Stage, R. R. Snelling); one, Santa Margarita, 6 mi. N. E., S. L. Obispo Co., June 22, 1958 (E. G. Linsley); two, Ar-royo Seco, Monterey Co., May 2, 1959 (Don Burdock), May 5, 1956 (Dave Rib-blc); two, California Hot Springs, Tulare Co., June 4, 1934 (E. C. VanDyke), (E. R. Leach); five, Antioch, Contra Costa Co., two, May 6, 1939, one, May 16, 1936 (M. Cazier), one, April 25, 1936 (M. Cazier), one, June 23, 1957 (G. I. Stage). Paratypes are in collections of the California Acad¬emy of Sciences; the University of Cali¬fornia at Berkeley and Davis; the Los Angeles County Museum; the National Natural History Museum; San Jose State College; Utah State University; G. I. Stage, the University of Connecticut; and P. H. Timberlake, the University of Cali¬fornia, Riverside.
The specific name refers to the serrate margin of the apical sternum of the female
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