Lissorhoptrus buchanani Kuschel, 1952, 1951

O'Brien, Charles W. & Haseeb, Muhammad, 2014, Revision of the “ Rice Water Weevil ” Genus Lissorhoptrus LeConte (Coleoptera: Curculionidae) in North America North of Mexico, The Coleopterists Bulletin 68 (2), pp. 163-186 : 166-167

Lissorhoptrus buchanani Kuschel, 1952 ( Figs. 11, 12 , 24 )

Lissorhoptrus buchanani Kuschel 1952: 35 . Holotype male, Delaware, USA (USNM). 15 paratypes ( FMNH 2 , MCZC 1 , NZAC 6 , USNM 6 ).

Redescription. Male. Body medium-sized; moderately robust. Rostrum: Moderately long, 0.75X as long as prothorax; black, apex reddish brown, broadly subcylindrical; dorsum weakly curved, even; flattened along midline; with venter straight, lacking carina; basal 2/3 with scales contiguous, smooth, agglutinate; apical 1/3 clothed with subcontiguous, rough, plumose scales; sides subparallel; suprascrobal groove strongly developed. Head: Weakly convex; scales nongranulate, contiguous, gray-brown and white; plumose scales whitish and yellowish on articulating area and around and behind eyes; frons with 2–4 indistinct, short submedian setae, broad, 0.61X as wide as head across eyes, flattened, indistinctly set off from rostrum by shallow impression. Antennae: Inserted at apical 1/3; scape moderately short, moderately stout, clavate, with 1–2 subapical setae; scape and funicle reddish brown; funicle long, 1.56X as long as scape; club elongate-oval, asymmetrical, 0.48X as long as funicle, reddish brown, 1 st club segment ca. 0.67X total club length, glabrous. Pronotum: Transverse, 0.84X as long as broad; sides unevenly, weakly rounded, moderately expanding from base and roundly widened just before middle; apical constriction moderately weak, in apical 1/8; scales dense, smooth, agglutinate; apical constriction dorsally distinct and uniform, moderately rounded behind constriction, sides weakly impressed behind round area; disc transversely flattened, not undulate, not rugose or rugulose; sides grayish white; ocular lobes moderately developed. Elytra: Humeri 1.35X wider than pronotum; 1.51X longer than wide at humeri; subparallel behind humeri to declivity, declivity at 75° (in relation to dorsal plane); markedly wider than prothorax; apices subacuminate, conjointly slightly emarginate; humeri well-developed, subangulately rounded, subacutely produced; intervals uneven in width, flattened to weakly convex; odd-numbered intervals without swellings and setae; strial grooves distinct, shallow, moderately narrow, punctures small, narrowly rounded, and separated by own diameter, not wider than strial grooves; scales nongranulate, contiguous, oval, arranged irregularly, usually with 3 or more scales across intervals, gray, grayish brown, and grayish white; fasciate; cuticle reddish black. Venter: Prosternum medially clothed, broadly in front of coxae and broadly behind coxae, with plumose scales. Abdominal ventrites: Ventrite I with median impression moderately deep, broad, less deep in apical 1/2, not narrowed apically, not continued on ventrite II; ventrite I with apical margin not declivous, 1.43X as long as II; ventrite II flattened, apical 2/5 declivous, not impressed on declivity; 2.80X as long as III and IV together; ventrite V transversely convex basally; transversely impressed apically, impression deep, broad, lacking median subapical carina or tubercle; with 2 pairs of coarse, erect apicolateral setae; 4.00X as long as III and IV together; 1.43X as long as II; 1.00X as long as I; I and II completely clothed, with contiguous, agglutinate scales; III and IV completely clothed, with dense, suberect, plumose scales, and setae lacking. Tergite VII: Apical margin nearly straight, truncate. Legs: Moderately long; femora weakly clavate, reddish brown; tibiae slender, reddish brown; fore and hind tibiae with inner margin weakly bisinuate, with outer margin straight or nearly so toward apex (in lateral view), with few inconspicuous bristles on inner surface, with short inconspicuous bristles on outer surface; middle tibiae with long, fine, swimming hairs on inner and outer margins; hind tibial mucro 2-toothed, basal tooth small, acute, posteriorly directed, median tooth lacking, apical tooth large, slightly internally directed; tarsi moderately long, broad, reddish brown, slightly widened toward apex; tarsomere 3 distinctly wider at apex than 2, sublinear, subemarginate; claws reddish brown. Standard length: 2.70 mm.

Female. Rostrum: 0.71X as long as prothorax; frons broad, 0.54X as wide as head across eyes. Antennae: Inserted just behind apical 0.33. Elytra: 1.32X wider at humeri than pronotum; 1.46X longer than wide at humeri. Tergite VII: Apical margin moderately deeply emarginate medially. Abdominal ventrites: Ventrite I 1.67X as long as II; median impression shallow, narrow, transverse basally; ventrite II flattened; not impressed on declivity, apical 1/10 declivous; ventrite V evenly convex basally, transversely impressed apically; impression shallow, broad, lacking median subapical carina or tubercle. Standard length: 2.80 mm.

Intraspecific Variation. This is a relatively uniform species varying slightly in scale color, from gray maculate with white to brown maculate with tan. Occasionally, the patterns of scale color form fasciae, especially at the declivity of the elytra. The elytral intervals are flat to weakly convex and the declivity at times has weakly swollen evident tubercles. The size of the body ranges from 2.20–3.40 mm.

Remarks and Comparative Notes. This species is similar in appearance to L. chapini which is more elongate and narrower, the elytra slightly broader than the pronotum, and lacks the strong premucro on the male hind tibia.

Biological Notes. This species has been reared in large numbers from the roots of wild rice along with even greater numbers of L. oryzophilus (P. Hanson, unpublished thesis 1978).

Distribution. Northeastern USA to the Great Lakes states, from Connecticut, District of Columbuia, Delaware, Michigan, Minnesota, New Jersey, New York, Pennsylvania, and Texas.

Material Examined. 51 specimens, including holotype. CONNECTICUT: Chester, 19-VI-1964 (10). DISTRICT OF COLUMBIA: Washington Kenilworth Aquatic Gardens, 14-VI-1950 (2). MINNESOTA: Aitkin Co., Mahnomen Rice Co., 28-VI-1978 (19), 29-VI-1978 (9), Clearwater, Chamber Creek, 13-VI-1978 (2); Anoka Co., Fish Lake, 15- VII-1978 (2), 24 -VII-1978 (3); Itasca Co., Grand Rapids, Zizania , 10-VI-1978 (1). NEW JERSEY: Burlington Co., Centerton, on Sagittaria , 4-VII-1944 (1). PENNSYLVANIA: Phila. Neck, 25-V (1). Specimens are in ASUT, AUIC, and CWOB.

Figures

Figs. 9–18. Lissorhoptrus species, habitus, dorsal and lateral views. 9, 10) L. lacustris; 11, 12) L. buchanani;

Figs. 19–30. Lissorhoptrus species. 19–27: Male hind tibial mucro (internal lateral view). 19) L. simplex; 20) L. oryzophilus; 21) L. lacustris; 22) L. longipennis; 23) L. longitarsus; 24) L. buchanani; 25) L. chapini; 26) L. insularis; 27) L. robbinsorum. 28) L. oryzophilus, female hind tibial mucro. 29–30: Apical margin of female seventh tergite. 29) L. oryzophilus, a = deep emargination, b = extruded ovipositor; 30) L. simplex, c = shallow emargination.