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Ataenius puncticollis (Le Conte)

Comprehensive Description

provided by Smithsonian Contributions to Zoology
Ataenius puncticollis (LeConte)

Euparia puncticollis LeConte, 1858:66.

Ataenius puncticollis.—Harold, in Gemminger and Harold, 1869: 1067.—Horn, 1887:77.—Schmidt, 1922:434.—Cartwright, 1951:29.

Ataenius inops Horn, 1887:72.—Schmidt, 1922:449.—Cartwright, 1951:29.

DESCRIPTION.—Length 3.1 to 4.2 mm; width 1.2 to 1.7 mm. Oblong, subparallel, moderately convex, shining, dark red-brown, sometimes pronotum and head darker. Head convex, edge finely reflexed, clypeus sharply, triangularly dentate each side of moderately deep median emargination, sides weakly arcuate, right-angled genae sharply rounded; clypeal surface strongly, coarsely, transversely wrinkled, a few close, minute punctures at base, frontal and occipital area closely, very finely punctate. Pronotum convex, two-thirds as long as wide, anterior angles obtusely rounded, posterior angles broadly rounded, base slightly sinuate before middle, sides and base margined, very minutely crenate-fimbriate; surface closely, evenly, very moderately punctate throughout, punctures usually separated by their diameters on disc, smaller and closer along anterior margin. Elytra convex, about seven-tenths as wide as long, humeri very finely, inconspicuously dentate; striae fine, deep, strial punctures fine, crenating inner margins of nearly flat intervals, a row of close, very fine punctures along outside margin. Mesosternum shagreened with fine, alutaceous sculpture and very fine, short, appressed hair, carinate between the coxae. Metasternum smooth, shining, disc with scattered, very minute punctures, midline fine, moderately deep, lateral scabrous area at sides extending inward almost to disc where it breaks up into fine punctures close to middle coxae, metasternal triangle slightly roughened in anterior angle. First visible abdominal sternum with posterior marginal line, remaining four sterna finely fluted along anterior margin, surface very moderately punctate from side to side, finer at middle, coarser toward sides where the punctures are generally separated by their diameter or less, finer and closer on 5th sternum. Pygidium very finely punctate and convex at apex, concave and eroded basally. Anterior femora with perimarginal groove, surface shining, some scattered, very minute punctures. Middle femora smooth, shining, posterior marginal line at knee a little less than half femur length. Posterior femora similar but with a very short line at knee. Posterior apical tibial fringe of eight short, close setae, without accessory spine. First posterior tarsal segment short, enlarged apically and narrowed basally, about three-fourths as long as long spur, a trifle shorter than following three segments combined. The males have the 4th sternum slightly shorter at middle and the pygidium comparatively longer than in the female.

HOLOTYPE.—Museum of Comparative Zoology, No. 3731. (Type of A. inops Horn in Academy of Sciences of Philadelphia, No. 3607.)

TYPE-LOCALITY.—El Paso, Texas. (A. inops, Horn, “Arizona.”

SPECIMENS EXAMINED.—456+.

DATES COLLECTED.—January 25 to November 8.

DISTRIBUTION (Figure 7).—Arizona: Arivaca, Blake Dike Project (Sierrita Mts.), Browns Canyon (Baboquivari Mts.), Carr Canyon (Huachuca Mts.), Chiricahua Mts., Clifton, Cochise Stronghold (Dragoon Mts.), Colossal Cave Park, Continental (Pima County), Douglas, Florence, Fort Grant, Fort Yuma, Gila Bend (Maricopa County), Globe, Guadelupe Canyon (Cochise County), Hot Springs, Kits Peak Rincon (Baboquivari Mts.), Madera Canyon, Marjilda Canyon (Graham Mt.), Mesa (19 mi NE, Maricopa County), Nogales, Noon Creek Mt. (Graham County), Oracle, Organ Pipe Cactus National Monument (Pima County), Pajarita Mts., Palmerlee (Cochise County), Patagonia Mts., Pena Blanca, Piney Canyon (Chiricahua Mts.), Portal (Southwest Research Station), Rimrock, Robles Ranch (20 mi SW of Tucson), Sabino Canyon (Catalina Mts., Pima County), St. Johns (Apache County), Santa Cruz County, Santa Rita Mts., Santa Rosa Mts., San Xavier (near Tucson), Sycamore Canyon (Santa Cruz County), Texas Pass, Tucson, Wickenberg, Wilcox, Williams. California: Napa County. Colorado: Rocky Ford. Indiana: Marion County. New Mexico: Las Cruces, Lordsburg, Mesilla Park, Rodeo (18 mi N). Texas: Alpine, Austin, Big Bend National Park, Cypress Mills, Davis Mts., Del Rio, El Paso, Enchanted Rock, Fort Davis, Lajitas, Laredo, Round Mts., Sanderson, Stockley, Terlingua Creek, Victoria, Weslaco.
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bibliographic citation
Cartwright, Oscar Ling. 1974. "Ataenius, Aphotaenius, and Pseudataenius of the United States and Canada (Coleoptera: Scarabaeidae: Aphodiinae)." Smithsonian Contributions to Zoology. 1-106. https://doi.org/10.5479/si.00810282.154