Ataenius parkeri

Ataenius parkeri

DISCRIPTION.—Holotype Male: Length 4.3 mm; width 1.5 mm. Very elongate, parallel, piceous, anterior margin of pronotum, anterior margin of head, and legs reddish, strongly shining, polished. Head convex, a low, sharp, widely based tooth each side of the wide, shallow, median emargination, finely reflexed sides weakly arcuate to slightly depressed, rounded genae; clypeal surface narrowly, slightly concave, smooth around anterior margin, disc transversely wrinkled, frontal area with a somewhat irregular transverse band of very moderate punctures separated by their diameters or less, occiput smoother with fewer punctures. Pronotum convex, length 1.2 mm, width 1.4 mm, finely margined, edge entire without setae or crenations, anterior angles narrowly but obtusely rounded, hind angles obliterated, the arcuate sides smoothly rounded into base; surface with mixed, very moderate punctures and intermixed, extremely minute punctures, the moderate punctures are irregularly scattered over much of the surface but more numerous about halfway toward the sides, very few on middle disc and near the margins, noticeably absent posteriorly around sides and posterior angles. Elytra long, parallel, length 2.6 mm, width 1.5 mm, humeri very finely dentate, striae fine, moderately deep, strial punctures as wide as striae, slightly crenating sides of intervals on each side, separated by about three times their diameters; intervals almost flat, only slightly more convex over apical declivity, lateral intervals not different, surface shining, polished but with scattered, very inconspicuous, extremely minute punctures under high magnification. Mesosternum shagreened with fine, alutaceous sculpture and fine, short, appressed hair, a very fine, sharp carina between the coxae. Metasternum smooth, shining, midline fine, scarcely impressed. Abdominal sterna smooth, polished, anterior margin finely fluted, first two sterna with a few minute to fine punctures near sides, 4th sternum about half as long as preceding sternum, 5th about three-fourths as long as 4th. Pygidium convex, shining, polished. Anterior femora without marginal grooves, the anterior edge with two long setae near trochanter, separated by about their length, set in a noticeable pore, outer half of margin flared in a thin, arcuate, almost transparent plate, surface smooth and shining. Middle and hind femora smooth, shining, without posterior femoral lines. First hind tarsal segment slightly longer than following three tarsal segments combined, subequal to long spur. Posterior tibial, apical fringe of seven setae, slightly unequal in length.

Allotype Female: Length 4.4 mm; width 1.5 mm. The greatest difference is in the terminal sterna of the abdomen, the 4th sternum being nearly as long as the preceding sternum, the 5th sternum about three-fourths as long as the 4th and the pygidium relatively much shorter than in the male. The allotype has a relatively longer first segment of the posterior tarsi.

Paratypes vary from 3.5 to 4.4 mm in length and 1.2 to 1.6 mm in width. Many specimens are dark red brown but otherwise there seems to be little variation except in the number of pronotal punctures, some specimens having relatively very few.

HOLOTYPE.—USNM 71734 (also allotype).

TYPE-LOCALITY.—Douglas, Arizona, at black light, 10–16 July 1968, J. H. Russell.

SPECIMENS EXAMINED.—362.

DATES COLLECTED.—May 25 to September 30.

DISTRIBUTION (Figure 3).—Paratypes. Arizona (346): “Arizona” (1), no date, C. Shaeffer Coll. (USNM). Bear Valley Ranch, Santa Cruz Mts. (3), black light, 2 August 1910, S. L. Wood, J. B. Karren, H. B. Shurtleff. Chiricahua Mountains (7): 2 August 1952, 7 August 1957, D. J. and J. N. Knull (3, OSU); 2 August 1961, L. J. Bottimer (3); 28 July to 7 August 1966, Karl H. Stephan (1). Cochise County (5): Near Portal (1), 28 July to 7 August 1966, K. Stephan; San Bernardino Ranch (4), no date, 3750 ft, E. G. Smit (3, U. Kans.), 3600 ft, no date, W. Nutting (1, Werner Coll.). Coyote Mountains (1): 4–7 August 1916 (M. Robinson Coll.). Douglas (121): July-September 1963, 10–16 July 1968, 7, 15 July 1969, 10, 25 August 1969, J. H. Russell (103); 23 August 1952, B. Malkin and Vet (10); August, F. H. Snow (2); 30 September 1957, B. Benesh (2); 13, 20 September 1957, W. Rosenberg (4). Dragoon Mountains, Cochise Stronghold (2): 11 August 1954, F. G. Werner (1); 25–27 July 1955, G. D. Butler and F. G. Werner (1). Huachuca Mountains (3): Sunnyside Canyon, 8 August 1970, 1 September 1970, K. Stephan (2); no other data (1). Madera Canyon, Santa Rita Mtn. (1), 31 July 1954, F. G. Werner. Nogales (39): 23 July 1940, 8 August 1950, 7 August 1952, J. J. and J. N. Knull (3); 7 July 1949, 4 August 1953, 30 July 1957, D. J. and J. N. Knull (35, OSU); 17 August 1947, F. H. Parker (1, Howden Coll.). Oracle (1), 4500 ft, 25 July 1917, Wheeler (MCZ). Patagonia (33): 5 July 1936, M. Cazier (1); 10 July 1936, A. T. McClay Coll. (15); 21 August 1940, F. W. Nunenmacher (3); 11 August 1954, 21 July 1955, 8 August, R. Schmitt (8, Werner Coll.); 2 August 1954 (1); 3 August 1958, R. H. Arnett, Jr. (1); no date, E. S. Ross (2, Saylor Coll.); 2 August 1953, J. J. and J. N. Knull (1, OSU). Near Patagonia, Santa Cruz County (1), no date, R. H. Arnett, Jr. Patagonia Mountains, west slope (2): 4400 ft, 27 July 1949, F. W. Werner and W. Nutting (1); 2 August 1953, D. J. and J. N. Knull (1, OSU). Pena Blanca (9): black light, 5 August 1964, J. Stibick (7); 21 July 1969, R. H. Arnett (1); no date (Santa Cruz County), R. H. Arnett, Jr. (1). Pena Blanca Canyon (13), Pajarito Mountains, black light, 28 July 1970, K. Stephan. Pima County (51): Colossal Cave Park (11), 4–11 August 1970, K. Stephan; Robles Ranch (40), 12 August 1947, Gillogly. Portal (12): 16 June 1956, Ellen Ordway (9); flood debris, 2 August 1961, L. J. Bottimer (3). Ruby (1), 7 August 1952, D. J. and J. N. Knull Knull (OSU). Safford (4), light trap, 23 June, 1 July 1954, F. G. Werner (Werner Coll.). San Carlos (1), 27 August 1935, Parker (M. Robinson Coll.). San Pedro River, Fairbanks (1), 6 September 1927, J. A. Kusche. Santa Catalina Mountains (6): Bear Canyon, 30 July 1970, K. Stephan (1); Sabino Canyon, July 1949, D. J. and J. N. Knull (1, OSU); Sabino Canyon, August 1955, F. G. Werner and G. D. Butler (3); foothills, 19 August 1970, K. Stephan (1). Sycamore Canyon (2), Santa Cruz County: 2 August 1958, R. H. Arnett, Jr. (1); near Ruby, 10 August 1955, F. G. Werner and G. D. Butler (1). Tucson (23): 21 July, 2 August 1970, K. Stephan (2); at light, 9 August 1928, R. B. Streets (1, Mank Coll., Cornell Univ.); 20 July, Hubbard and Schwarz (5); no date, Wickham (6); no date, H. Soltau Coll. (2, USNM); no date, Psota Coll. (6, Field Museum); no date, Cartwright Coll. (1, USNM). Tucson Mountains (1): 1 August 1950, D. J. and J. N. Knull (OSU). Wilcox (1): 24 July. Wilcox Playa, Cochise County (1), 29 August 1970, K. Stephan. New Mexico (13): Rodeo (13 mi N), 16 June 1956, H. and A. Howden (Howden Coll.). Texas (1): San Diego, 25 May, Hubbard and Schwarz. Mexico: Sonora (1): Hermosillo, 19–20 September 1952, B. Malkin.