Reprinted with permission of the University of Nebraska State Museum from:|
LaBerge, W. E. 1967. A revision of the bees of the genus Andrena of the Western Hemisphere. Part I. Callandrena (Hymenoptera: Andrenidae). Bulletin of the University of Nebraska State Museum 7: 1-316.
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This medium-sized bee from Arizona and Mexico is very similar and closely related to A. barberi Cockerell. A. monticola can be readily distinguished from barberi in both sexes by the short narrow sulcus on the posterior surface of the propodeum. A. monticola is similar to barberi but differs from rava in having dark hairs on the vertex, mesoscutum, scutellum and last two metasomal terga of both sexes and in having dark basitarsi and tibiae. As in rava, the tibial scopal hairs are only weakly plumose in the female and the propodeal corbicula is formed as in both rava. and barberi.
FEMALE. MEASUREMENTS AND RATIOS. — N = 20; length, 11-13 mm; width, 3-4 mm; wing length, M = 3.59 ± 0.068 mm; FL/FW, M = 0.99 ± 0.014; FOVL/FOVW, M = 2.82 ± 0.102.
INTEGUMENTAL COLOR. — Black except as follows: mandible dark rufescent; flagellum below dark brownish-black; tegulae piceous; wing membranes hyaline, colorless or slightly infumate apically and along veins, veins dark brown to black; terga 1-4 extremely narrowly hyaline apically; sterna 2-5 narrowly hyaline apically, somewhat rufescent basally; distitarsi dark rufescent; basitarsi piceous; tibial spurs yellow.
STRUCTURE. — Scape length and flagellar segments as in rava. Eye almost four times as long as broad, inner margins parallel. Malar space, mandibles and galeae as in barberi. Maxillary palpus as in helianthi but segmental ratio about 1.2:1.0:0.9:0.8:0.6:0.9. Labial palpus as in helianthi but segmental ratio about 2.7:1.0:0.9:1.2. Labral process as in barberi. Clypeus as in barberi but usually not dulled except at extreme base (not dulled in holotype) and with sparse irregular transverse weak rugulae often present. Supraclypeal and genal areas as in barberi. Vertex above lateral ocellus equal to about one ocellar diameter, sculptured as in barberi. Face above antennal fossae and facial foveae as in rava.
Thoracic structure and sculpturing as in barberi except propodeum with posterior longitudinal sulcus narrow, short, with distinct lateral margins. Wing venation, tibial spurs, middle basitarsi as in barberi.
Metasomal terga 1ó4 sculptured as in barberi but basal area punctures slightly more distinct. Pygidial plate V-shaped, apex rounded, without raised internal triangular area. Sterna 2-5 sculptured as in barberi.
VESTITURE. — Generally as in barberi with the following differences; terga 1-4 with apical fasciae white; tergum 1 with a complete but weak apical fascia or fascia interrupted medially and weak at sides; tergum 2 with apical fascia weak or narrowly interrupted medially; scopal hairs weakly plumose throughout, an occasional hair simple.
MALE. MEASUREMENTS AND RATIOS. — N = 20; length, 10-12 mm; width, 2.5-3.0 mm; wing length, M = 3.37 ± 0.115 mm; FL/FW, M = 1.02 ± 0.005; FS1/FS2, M = 1.93 ± 0.029.
INTEGUMENTAL COLOR. — Black except as follows: mandible with apical half rufescent; flagellar segments 2-11 dark brownish-black below; clypeus yellow except apical margin, dark maculae below and mesad of tentorial pits, lateral angles and narrow basal margin dark; tegulae piceous; wing membranes hyaline, slightly infumate apically, veins dark brown to black; terga 1-5 extremely narrowly hyaline apically, occasionally slightly rufescent basad of hyaline margins (allotype); sterna 2-5 narrowly hyaline, yellowish apically; distitarsi dark rufescent; basitarsi and tibiae piceous; tibial spurs yellow.
STRUCTURE. — Antennae short, in repose extending back to just beyond tegulae; scape length equals flagellar segments 2 and 3 plus half of 4; flagellar segment 1 subequal to segments 2 plus 3; segment 2 shorter than 3 which is shorter than segment 4; segments 4-10 longer than broad. Eye about three and three-fourths as long as broad, inner margins converging slightly towards mandibles. Malar space, mandible and galea as in female. Maxillary palpus as in helianthi but segmental ratio about 1.3:1.0:1.0:0.8:0.6:0.9. Labial palpus as in helianthi but segmental ratio about 1.9:1.0:0.7:1.0. Labral process, clypeus, supraclypeal area, and the genal area as in female. Vertex did Lire above antennal fossae as in female but weak facial rugulae between lateral ocellus and eye.
Thoracic sculpturing and structure as in female except as follows: mesoscutal and scutellar punctures slightly more distinct; propodeum with lateral surface coarsely tessellate, opaque. Wing venation as in helianthi but one specimen with only two submarginal cells in both wings and one specimen with two submarginal cells in left wing. Claws, tegulae and tibial spurs normal.
Tergal sculpturing as in female except terga 1-5 like female terga 1-4 but basal area punctures slightly larger. Pseudopygidial area scarcely discernible, extremely narrow. Sternum 6 flat with deep apical V-shaped emargination.
Genitalia and sterna 7 and 8 (Figs. 119-123) similar to those of rava but note the following: penis valves with sharp apices but greatly expanded near tip, narrow basally; dorsal lobes gonocoxites large, rounded apically; sternum 7 with apicolateral lobes large, horizontal at apices, with short stout hairs; sternum 8 more as in barberi than rava.
VESTITURE. — Generally white to pale ochraceous but vertex, mesoscutum, scutellum and terga 6 and 7 with sparse brown hairs; inner surfaces tarsi golden. Terga 2-5 with complete weak apical fasciae of white pubescence. Sterna 3-5 without distinct subapical fimbriae, subapical hairs of moderate length or short and decumbent.
TYPE MATERIAL. — The holotype (UCB) female and allotype (UCB) male from Rustlers Park, Chiricahua Mts., Arizona, were collected on Cirsium sp., August 26, 1959, by E. G. Linsley. Three female and twenty-six male paratypes were collected with the holotype and allotype. In addition, fifty-four female and twenty male paratypes (UAT; UCB; CAS; USU; SECK; INHS; AMNH; USNM) from the Chiricahua Mts., Arizona, are as follows: BARFOOT CAMP GROUNDS: 2 females, September 13, 1955, C. and M. Cazier. CHIRICAHUA MTS.: 2 females on Solidago sp., September 6, 1953, G. D. Butler; 12 females on Heliopsis sp., September 28, 1960, C. E. Bohart. ONION SADDLE: 1 female, September 13, 1955, C. and M. Cazier; 4 females, September 15, 1955, G. E. Bohart; 2 females, 7 males, September 3, 1959, J. R. Powers; 2 females, 2 males, September 4, 1959, P. H. Arnaud; 1 female, September 4, 1959, J. M. Burns; 7 females 2 males, September 5, 1962, J. G. Rozen, M. Statham, S. J. Hessel. PINERY CANYON: 1 male, September 8, 1950, T. Cohn, P. Boone, M. Cazier; 15 females, 2 males, September 5, 1952, J. G. Rozen, M. Statham, S. J. Hessel; 1 male, September 8, 1959, D. D. Linsdale RUSTLER'S PARK: 1 male, August 27, 1958, J. M. Marston; 2 females, 3 males, September 3, 1959, J. R. Powers; 1 female, 1 male, September 4, 1959, D. D. Linsdale; 1 female, September 4, 1959, J. M. Burns; 1 female, on Aster sp., August 31, 1964, C. D. Michener.
DISTRIBUTION. — A. monticola is known to range from the state Mexico in Mexico north to the Chiricahua Mts. in Arizona. It has been collected from April 20th (in Mexico) through September 28th. In addition to tile type material listed above, 4 females and 5 males from the following localities in Mexico have been examined: CHIHUAHUA: Santa Barbara. DURANGO: Palos Colorados. GUANAJUATO: Guanajuato. MEXICO: Texcoco; Meadow Valley.