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Andrena texana Cresson, 1872
Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Andrena
Subgenus: Callandrena_sensu_lato


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Overview
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 small species from Texas seems to be related to A. gardineri and is similar to the latter in size, punctation, shape of the facial foveae and form of the tergal fasciae. The female of texana differs from that of gardineri in the short, broad labral process, weak subgenal coronet and transverse propodeal rugulae. The male of texana differs from that of gardineri in the black clypeus, transverse propodeal rugulae, flat sixth sternum and longer third flagellar segment. A. texana, although similar to gardineri, is not closely related to that species. It also resembles A. krigiana in size and in the black male clypeus. The transverse propodeal rugulae, the sparsely punctate metasomal sterna and the longer third flagellar segment of the male will serve to distinguish texana from krigiana

FEMALE. MEASUREMENTS AND RATIOS. N = 10; length, 10-11 mm; width, 2.5-3.0 mm; wing length, M= 3.19 0.129 mm; 1L/FW, M = 1.04 0.006; FOVL/FOVW, M = 3.49 0.053.

INTEGUMENTAL COLOR. As in gardineri except wing membranes slightly infumate, especially in apical thirds, yellowish-brown. 1

STRUCTURE. Antennae short, scape length equals segments 1-4; flagellar segment 1 equal in length to succeeding two and one-half segments or more; segments 2 and 3 short, equal in length, considerably shorter than segment 4; segments 4-6 quadrate, 7-10 longer than broad. Eye about four times as long as broad, inner margin converging extremely slightly toward mandibles. Malar space linear.

Mandible as in gardineri but without basoventral lamella and subgenal coronet poorly developed. Galea as in gardineri. Maxillary palpus as in gardineri but segmental ratio about 1.3:1.0:0.6:0.7:0.5:0.8. Labial palpus as in gardineri but segmental ratio about 2.0:1.0:0.9:0.9. Labral process three to four times as broad as long. entire or with shallow median emargination, not at all bidentate. Clypeus flattened medially, protruding beyond ends of eyes by less than one-third length of clypeus; with small round punctures separated mostly by half to one puncture width except along median impunctate line, surface shiny, unshagreened. Supraclypeal area as in gardineri. Genal area slightly broader than eye in profile, sculptured as in gardineri. Vertex as in gardineri but with sparse punctures above facial foveae. Face above antennal fossae with strong longitudinal rugulae slightly diverging above, reaching lateral ocelli and a few between lateral ocelli and foveae; interrugal spaces with coarse, moderately sparse punctures, moderately shiny. Facial fovea short, narrow, deep, separated from compound eye its entire length by a shiny area almost as broad as base of first flagellar segment, slanted inwards towards ocelli, reaching level of upper margin of antennal fossae or lower, separated from lateral ocelli by one-half to one ocellar diameter.

Thoracic structure and sculpturing as in gardineri except as follows: propodeal dorsal enclosure moderately coarsely rugulose, irregularly so basally, becoming transversely rugulose near apex and on posterior surface; mesepisternal punctures shallow, indistinct.

Metasomal structure as in gardineri except as follows: tergum 1 with punctures separated mostly by two to three puncture widths; terga 2 and 3 with basal area punctures separated mostly by one to two puncture widths; tergum 4 with basal area punctures separated mostly by two to four puncture widths. Pygidial plate V-shaped with sides bowed out gently and apex broadly rounded, with raised internal triangular area. Sterna 2-5 with apices impunctate, basal areas extremely sparsely punctate except laterally and pin one or two rows of more crowded punctures subapically; surfaces moderately shiny, with coarse reticular shagreening.

VESTITURE. As in gardineri except as follows: tergum 1 with apical pale fascia broadly interrupted medially by more than half width of tergum; tergum 2 with pale apical fascia narrowly interrupted or weak medially; propodeal corbicula with internal hairs plumose, largely in anterodorsal half; tibial scopal hairs relatively short especially apically.

ale. MEASUREMENTS AND RATIOS. N = 20; length, 8-10 mm; 26f

width, 2.0-2.5 mm; wing length, M = 3.05 0.121 mm; FL/FW, M = 1.10 0.009; FS1/FS2, M = 1.86 0.023.

INTEGUMENTAL COLOR. As in gardineri except as follows: clypeus black; parocular areas black; flagellar segments 2 or 3 to 11 dark reddish-brown below; wing membranes slightly infumate apically, veins dark brown to reddish-brown.

STRUCTURE. Antennae as in gardineri but segment 1 slightly shorter than segments 2 plus 3 and slightly longer than segment 3, segment 2 distinctly shorter than 3; segments 3-9 quadrate or extremely slightly longer than broad, 10-11 longer than broad. Eye about three times as long as broad or slightly longer, inner margins converging towards mandibles. Malar space and mandible as in female but subgenal coronet absent. Galea as in female. Maxillary palpus as in female but segmental ratio about 1.3:1.0:0.9:0.9:0.7:1.1. Labial palpus as in female but segmental ratio about 2.3:1.0:0.9:1.0. Labral process bidentate, though teeth often somewhat blunt. Clypeus, supraclypeal area, genal area, vertex and face above antennal fossae as in female. Extremely small vestige of facial foveae present near inner upper eye margins.

Thoracic sculpturing and structure as in female except as follows: mesoscutum and scutellum often slightly shinier; propodeal dorsal enclosure usually with transverse apical rugulae more distinctly developed. Metasomal tergal sculpturing as in female but tergum 1 with punctures separated mostly by two puncture widths or slightly less and terga 2-5 with basal area punctures separated mostly by one puncture width or slightly more. Pseudopygidial area not evident. Sterna 2-5 sculptured as in female. Sternum 6 flat apically.

Genitalia and sterna 7 and 8 (Figs. 302-306) as figured. Note the following: penis valves short, broad apically, narrow basally; gonoforceps blunt at tip, bent down only moderately; dorsal lobes gonocoxites short; sternum 7 deeply emarginate apicomedially, median length moderately long; sternum 8 with neck region short, apical area large, rounded, entire or almost so.

VESTITURE. Generally as in female with the following differences: tergum 1 with pale apical fascia narrowly interrupted medially; terga 2~5 with complete pale apical fasciae; sterna 2-5 with subapical fimbriae of long, slightly curved, erect hairs.

TYPE MATERIAL. The male lectotype was collected in Texas (PANS No. 2796).

DISTRIBUTION. A. texana has been collected so few times that data for these specimens are given in full.

TEXAS: Roosevelt. 1 female, 11 males, on Amphiachyrus sp., September 25, 1906, F. C. Pratt. Victoria. 11 females and 10 males, on Aster sp., November 6, 1904, A. . Lister. 3 females and 6 males with no data except "TEX." and 2 females from the Belfrage collection with the same data. Mexico. SAN LUIS POTOSI: Valles. 1 male, October 6, 1957, H. A. Scullen.

Names
Scientific source:

References
Andrena texana Cresson, 1872, Trans. American Ent. Soc., vol. 4, p.258.

Andrena imitatrix var. texana: Leonard, 1928, Cornell Univ. Agric. Exper. Sta., Mem. 101, p. 1023; Cockerell, 1929, Ann. Ent. Soc. America, vol. 22, p. 755.

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