Lissorhoptrus chapini 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 : 167-168

Lissorhoptrus chapini Kuschel, 1952 ( Figs. 13, 14 , 25 )

Lissorhoptrus chapini chapini Kuschel 1952: 33 . Holotype male, New York City and vicinity, USA (USNM). 5 paratypes ( NZAC 2 , USNM 3 ).

Redescription. Male. Body medium-sized; moderately robust. Rostrum: Moderately long,

0.73X as long as prothorax; reddish black, subcylindrical; dorsum weakly gibbous basally, apex abruptly depressed; convex along dorsal midline; venter straight, lacking carina; basal 2/3 completely clothed, with scales contiguous, smooth, agglutinate; apical 1/3 clothed with contiguous, rough, plumose scales; sides subparallel; suprascrobal groove strongly developed. Head: Moderately convex; scales nongranulate, imbricate, brownish; whitish plumose scales whitish on articulating area and around and behind eyes; frons lacking submedian setae, broad, 0.50X as wide as head across eyes, flattened, indistinctly set off from rostrum by shallow impression. Antennae: Inserted at apical 2/5; scape moderately short, moderately stout, strongly clavate, with 1–2 subapical setae; scape and funicle reddish; funicle short, 0.83X as long as scape, club broad-oval, asymmetrical, 0.73X as long as funicle, reddish brown, 1 st club segment ca. 1/2 total club length, glabrous. Pronotum: Transverse, 0.88X as long as broad; sides sinuately subparallel, moderately expanding from base; apical constriction strong, in apical 1/6; scales dense, roughened, agglutinate; apical constriction dorsally distinct and uniform, moderately rounded behind constriction, sides slightly impressed behind round area; with disc transversely weakly convex, not undulate, not rugose or rugulose; pleuron grayish white; ocular lobes moderately developed. Elytra: 1.25X wider at humeri than pronotum; 1.54X longer than wide at humeri; gradually expanding behind humeri to declivity, declivity at 75° (in relation to dorsal plane); moderately wider than prothorax; apices subacuminate, conjointly slightly emarginate; humeri moderately developed, obliquely angulate, not at all produced or projecting; intervals rather regular in width, moderately convex, odd-numbered intervals with setae inconspicuous; suberect, not curled, fine, associated with scarcely evident swellings; swellings becoming progressively larger and more acute posteriorly; strial grooves distinct, moderately deep, narrow, punctures minute, scarcely evident, elongate, narrow, deep, scarcely wider than strial grooves; scales flattened, contiguous, oval, arranged irregularly, usually with 3 or more scales across intervals, gray, grayish brown, and grayish white; immaculate; cuticle black. Venter: Prosternum medially clothed, narrowly in front of coxae and broadly behind coxae, with plumose scales. Abdominal ventrites: Ventrite I with median impression very deep, moderately broad, uniformly impressed for entire length, not narrowed apically; median impression continued on basal 1/2 of ventrite II, ventrite I with apical margin not declivous, 1.69X as long as II; ventrite II medially impressed, with impression narrow, shallow, apically declivous, weakly laterally impressed on declivity; 2.60X as long as III and IV together; ventrite V basally flat, transversely impressed apically, impression moderately 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; 1.54X as long as II; 0.93X as long as I; I and II completely clothed with contiguous, agglutinate scales; III and IV completely clothed with dense, recumbent, plumose scales, and lacking setae. Tergite VII: Apical margin nearly straight, medially weakly emarginate. Legs: Moderately long; femora clavate, reddish brown; tibiae moderately slender, reddish brown; fore and hind tibiae with inner margin weakly bisinuate, outer margin slightly arcuate toward apex (in lateral view), several moderately short bristles on inner surface, short inconspicuous bristles on outer surface; middle tibiae with short, fine swimming hairs on inner and outer margins; hind tibial mucro 3-toothed, basal tooth moderately large, acute, slightly posteriorly directed, median tooth very small, scarcely evident, externally directed, apical tooth large, acute, apically directed; tarsi moderately long, broad, reddish, broadened toward apex; tarsomere 3 distinctly wider at apex than 2, subemarginate; claws reddish brown. Standard length: 2.80 mm.

Female. Rostrum: 0.64X as long as prothorax. Elytra: 1.22X wider at humeri than pronotum; 1.42X longer than wide at humeri. Abdominal ventrites: Ventrite I lacking median impression; 1.76X as long as II; II convex, not impressed on declivity, apically declivous; V transversely convex basally, transversely impressed apically, impression moderately deep, broad, lacking median subapical carina or tubercle. Standard length: 3.20 mm.

Intraspecific Variation. The few specimens examined are relatively uniform except for the body size, 2.70–3.20 mm.

Remarks and Comparative Notes. This species is similar to L. buchanani , which is shorter and broader, elytra much broader than the prothorax, and has a strong premucro on the male hind tibia. See notes under L. insularis for reasons for changing the rank of these former subspecies to two valid species.

Biological Notes. No host known, but the species has been associated with a saline intertidal marsh and a salt meadow.

Distribution. Massachusetts, New Jersey, New York, and Pennsylvania.

Material Examined. 8 specimens including holotype. MASSACHUSETTS: W Barnstable, Navigation Rd. marsh saline intertidal area, 23-VII-1968 (1). NEW JERSEY: Brigantine, 26- VI (1). NEW YORK: Staten Is., salt meadow, 6-V (2); 10-V (1). PENNSYLVANIA: Norwood , 6-V (1); 31-V1 (1). Specimens are in CWOB and MCZC .

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.