Ataenius cylindrus Horn 1871

Ataenius cylindrus Horn

Ataenius cylindrus Horn, 1871:289; 1875:142.

Ataenius horni Harold, 1874a:19.

Ataenius cylindricus Schmidt, 1922:454.

DESCRIPTION.—Length 3.3 to 4 mm; width 1.2 to 1.8 mm. Oblong, convex, black, moderately shining. Head convex; clypeus sharply dentate each side of moderately broad, moderately deep, triangular emargination, sides weakly arcuate to nearly right-angled genae, edge finely reflexed; surface concave behind emargination, elsewhere convex and finely, closely, evenly punctate; front and occipital area densely, moderately punctate, the practically contiguous punctures twice the size of the clypeal punctures. Pronotum convex, the sides not completely visible viewed from directly above, about one-fourth wider than long, anterior angles obtusely rounded, posterior angles slightly emarginate, sides and base margined, posterior angles and base distinctly crenate-fimbriate, the setae separated by more than their length, those of the sides anteriorly extremely short and inconspicuous, surface densely, shallowly, moderately punctate throughout, the punctures minutely setigerous and general surface minutely alutaceous under high magnification, punctures gradually a little finer anteriorly at middle. Elytra elongate-oval, humeri dentate, one-third longer than wide, margin without noticeable setae; elytral striae wide, deep, rather coarsely punctate, the punctures slightly crenating the inner side of the intervals, intervals usually subcarinately convex with a minutely alutaceous, more or less distinct shoulder each side of the middle convexity, each interval with two rows of widely spaced, minute punctures, the inside row high up on the shoulder or over the middle of the convexity, the outside row about the middle of the shoulder, extreme lateral interval flat and finely alutaceous. Mesosternum narrowly carinate between the coxae. Metasternum with strong, deep midline, disc with numerous moderate punctures generally separated by their diameters or two times their diameters, the punctures extending outward to the wide, scabrous surface at sides, the scabrous area extending into the metasternal triangle; abdominal sterna finely punctate from side to side, the punctures generally separated by their diameters or two times their diameters, a little finer at middle; sterna fluted anteriorly as usual, the middle fluting of the 5th sternum about one-half its total length; pygidium longer in the male, the median area eroded as usual. Anterior femur with perimarginal groove, punctate and shining along anterior margin, remainder of surface scabrous. Middle and posterior femora punctate throughout, the punctures a little finer and closer than on disc of metasternum, postfemoral lines deep and entire. Posterior tibial fringe a group of seven or eight short, close setae, a short accessory spine of same length, and an intervening seta between the accessory spine and spurs. Long spur, first posterior tarsal segment, and the three following segments combined are about equal in length.

LECTOTYPE (present designation).—Academy of Natural Sciences of Philadelphia, No. 3605.

TYPE-LOCALITY.—Florida. Original description also mentions South Carolina and Georgia.

SPECIMENS EXAMINED.—450+.

DATES COLLECTED.—January 28 to November 6.

DISTRIBUTION (Figure 14).—Alabama: Auburn, near Helena, Mobile, Monroeville, Montgomery, Selma, Spring Hill, Storrsland. District of Columbia. Florida: Alachua County, Archbold Biological Station (Lake Placid), Buck Key, Capron, Centerville, Clewiston, Crescent City, Dunedin, Dunnellon, Enterprise, Fort Lauderdale, Fort Myers, Fort Ogden, Gainesville, Goldhead, Haw Creek, Highlands Hammock State Park, Jacksonville, Jungle Road (Taylor County), Jupiter, Kissimmee, Korishan State Park, La Belle, Lacooche, Lake Harney, Lake Letta, Lake Wales, Levy County, Marion County, McIntosh, Miami, Moore Haven, Myakka River State Park, Ocala, Oneco (Manatee County), Pablo Beach, Palatka, Pensacola, Punta Gorda, Sanford, Sarasota, Tallahassee, Tampa, Winter Park. Georgia: Beachton, Demarest, Hazelhurst, Hinesville, Milner, Nashville, Okefenokee Swamp, Pine Mt., Prattsburg, Tifton, Ware County (S. L. Walker State Park), Waycross. Kentucky: Wolf Creek Lake (Wayne County). Louisiana: Covington. Maryland: “Maryland,” Pocomoke Swamp. Mississippi: Camp Shelby, George County, Gulfport, Horn Island. New Jersey: Martha. North Carolina: Carthage, Southern Pines, Swan Quarter, Tryon. Pennsylvania: “Pennsylvania.” South Carolina: Beaufort, Berkeley County, Blackville, Blaney, Cameron, Cayce, Charleston, Clemson, Colleton County, Columbia, Congaree, Edisto Island, Florence, Folly Beach, Georgetown County, Hampton, l’on Swamp, Lugoff, Marion, Moncks Corner, Mount Pleasant, Oconee CCC Camp, Orangeburg, Pelion, Pontiac, Pritchardville, Ritter, Seabrooks Island, Summerville, Sumter, Walterboro, White Pond, Williamsburg County, Yemassee, York County (Route 91 at Chester County line). Tennessee: “ Tennessee.” Texas: Willis. Virginia: Accomac, Arlington, Camp Picket, Chatham, Fort Monroe, Nelson County, Virginia Beach.

○ lobatus □ tanguidus ● glaseri robustus