Laccophilus undatus Aubé 1838

Laccophilus undatus Aube (Figs. 225-233, 322)
Laccophilus undatus Aube, 1838, p. 435. Neotype: male, United States National Museum, Bloomington, Monroe Co., Indiana, iv.20.56, J. R. Zimmerman; Crotch, 1873, p. 400; Blatchley, 1910, p. 210; Leng, 1920, p. 77; Zimmermann, 1920, p. 27; Zimmerman, 1960, p. 144.
DIAGNOSIS. — The variegated elytral pattern and darkened palpi and antennae separate undatus from all other North American Laccophilus. The only other species with darkened antennae and palpi is biguttatus, but it has nearly unicolorous elytra of brownish-yellow color.
DESCRIPTION. — Small to medium (length, 3.2 to 4.3 mm; width, 2.0 to 2.3 mm), brown and yellow, variegated species; metacoxal file absent; prosternal process short; ovipositor sawlike. COLOR. Head: yellowish-brown with a tinge of red; slightly darker at occiput; appendages with darkened tips on the last two or three segments of the maxillary palpi; sometimes the labial palpi, and the last six or seven segments of the antennae. Pronotum: variable reddishyellow brown or their combinations; usually darker on the disc and paler on lateral margins; a darkened area on the anterior margin between the eyes. Elytra: complex variegated pattern superimposed on a pale brownish-yellow background tending to form two incomplete irregular transverse yellow fasciae; one subbasally and the other just behind the middle; epipleura pale brownishyellow anteriorly, but darkening to reddish-brown posteriorly. Tergite VIII: light yellowish-brown. Venter: varying combinations of light red, yellow, and brown; prosternum, mesosternum, proand mesolegs usually lighter; metacoxal plates, abdomen, and hind legs usually darker, tending more toward reddishbrown. Genitalia: about the same as the abdomen, but usually tending more strongly to reddish-brown. ANATOMY. Microreticulation: strongly impressed and clearly double on head, pronotum, and elytra; surface shining, especially in males. Head: supraclypeal seam diverging slightly upward at midline. Pronotum: WH/PW, 0.72; LP/PW, 0.39. Elytra: female without epipleural flanges; apices without truncation. Venter: metacoxal file absent; postcoxal processes rounded and laterally projecting well past the midline; last ventral segment of both sexes not truncated, but evenly rounded; median crest weak and nearly symmetrical in males; setigerous punctures sparsely distributed; outline of female segment subtriangular with well-defined median ridge; setigerous punctures thicker near apex. Legs: proand mesotarsi enlarged in a dorsoventral plane; palettes easily visible at 20 power magnification; fifth tarsal segment on both pair of front legs about one and one-half times as long as corresponding fourth; setae on profemoral margin (6) similar in length and diameter to those on mesofemur (6 to 7). Genitalia: oval plate with strongly produced asymmetrical acuminate tip; crest extending anteriorly with slight curvature to the right; more fine lines on right than on left side of the crest; aedeagus curved sharply at about two-thirds its length and twisted with conformation suggestive of a raised cobra; right paramere less broadly triangular than in maculosus; left paramere with less rounded apex than in maculosus tending to form an angle; ovipositor with about 16 sawlike teeth.
NOMENCLATURAL NOTES. — Aube's type of undatus is apparently lost. There seems to be no confusion in the identity of this species, however.
VARIATION. — Females are slightly larger than males (Table 21, fig. 24). The individuals from Indiana may be larger than those from New York; but the western sample may be biased, since I had more material and probably selected specimens that were in better condition. — L. undatus occurs from Massachusetts to the vicinity around the southern margin of Lake Michigan and from northern New York and southern Vermont to near Washington, D. C. It ranges west as far as Bloomington, Indiana, and the southern edge of Michigan (fig. 21). It seems to be restricted to the shaded pools of the northeastern deciduous woodlands. In southern Indiana undatus was consistently found only in slough ponds in the drainage of a former intermittent stream. Those ponds were acidic with a pH of 6.6. Temperatures seldom, if ever, exceeded 30 degrees C. The bulrush Scirpus was abundant along the margins and was the principal emergent plant. Ludwigia and Zannichellia, which are characteristic of temporary aquatic situations, covered the bottom.
L. undatus approaches L. schwarzi near Washington, D. C, but so few specimens of either have been taken from there that it is not known whether they intergrade or not. Their anatomical features are sufficiently different to presume they do not. L. undatus is also sympatric without intergrading with L. biguttatus in upstate New York. UNITED STATES OF AMERICA. — ILLINOIS. Lake County. Lake Forest, 1 6, 2 2, ix.2.— (FM). INDIANA. Lake County. Miller, 2; Pine (Gary), 25, ix.23.30 (USNM). Monroe County. Bloomington, 4 m. N., 25 6, 1 2, iii.6.56; 2 6, 4 2, iii.21.56; 1 6, iv. 10.56; 1 6, iv.20.56; 11 S,
8 9, iv.26.56; 3 9, v. 11.56; 3 9, vi.7.56; 9 9, x.31.56; 10 9, xi.13.56; 8 9, xi.28.56; 2 9, vi. 18.57, JRZ (NMSU). MARYLAND. Montgomery County. Near Plummers Island, 1, ix.12.19, J. L. Wren (USNM). MASSACHUSETTS. Berkshire County. Egremont, 1 9 , C. H. Roberts (AMNH). Essex County. North Saugus, Howlett's Pond, 1, viii.25.07, D. H. demons (USNM). Middlesex County. Framingham, 1, iv. 10.19, C. A. Frost (CNL). Norfolk County. Brookline, 20 (USNM): 1 (CNL). Suffolk County. Boston, 1 9 (ANSP). Cambridge, 1 (USNM). Worcester County. Brookfield, 2, x.24.24, Chamberlain (CNL). Northboro, 1, i.— .37, C. A. Frost (BERK). MICHIGAN. Berrien County. Stevensville, 2 8 , 19, vi.9.63, vii. 10.63, R. B. Willson (MCHS). NEW JERSEY. Bergen County. Fort Lee, 48, ix.22.00, J. D. Sherman, Jr. (USNM). Ramsey, 1 9, v. 17.— , C. H. Roberts (AMNH). Camden County. County, 1 8, vi.ll. — (AMNH). Mercer County. Trenton, 1 9, iv.23. — , E. L. Dickerson (AMNH). Middlesex County. Spotwood, 1 9, C. H. Roberts (AMNH). Ocean County. Lakehurst, 6 8 , 2 9, v.29.— , C. H. Roberts (AMNH). Sussex County. Stanhope, L. Lackawanna, 1 9, viii. 14.32 (CNL). NEW YORK. Brooklyn County. Brooklyn, Cyp. Hills, 2, v.16.10, Shoemaker (USNM). Cattaraugus County. Alleghany, 2 9 (FM). Richmond County. Staten Island, Clove Valley, 1 8 , vi.3.— , W. T. Davis (MCHS) ; 24 (USNM); 6, iv.16.05 (USNM); 2 8, 19, x.11.24, L. B. Woodruff (AMNH); 1 <J, 11 8, 10 9, iv.19.— ; 2 9, v.20.— , C. H. Roberts (AMNH). Erie County. Buffalo, 1 8 , 2 9 (AMNH). Long Island, New York City, and Vic. Cold Spring Harbor, 1 8, viii.10.00 (AMNH). Long Island, Forest Pk., 4, v.—.— (USNM); 12, v.7.10 (USNM). New York City, 2 9 , C. H. Roberts (AMNH). Suffolk County. Orient, 25, vi. 30.43, R. Latham (CNL). Riverhead, 11, iv.30.40, R. Latham (CNL). Ulster County. Esopus, 6, J. D. Sherman, Jr. (USNM); 2 3,2 9, ix.l.— , C. H. Roberts (AMNH). Washington County. Washington County, 1, J. D. Sherman, Jr. (USNM). Westchester County. Peekskill, 3 (USNM). OHIO. Jackson County. Jackson, 1, x.20.50, P. J. Spangler (CAS). PENNSYLVANIA. Delaware County. 3 8, 2 9, v.18.— (ANSP). Philadelphia County. Phila-Neck, 2 (USNM). Philadelphia, Wyoming, 1, iv.29.04, G. M. Greene (USNM). RHODE ISLAND. 1 8, 1 9, Kemp Coll. (ANSP). VERMONT. Bennington County. Bennington County, 1 (USNM); 1 9 (CNG); 3 3,2 9, ix.16.— , 2 8, vii.— .94; 1 9, vii. 14.— , C. H. Roberts (AMNH) ; 1 9 (ANSP). VIRGINIA. Fairfax County. Black Pond, 1, ix.21.— , Shoemaker (USNM).

Laccophilus undatus is a species of predaceous diving beetle in the family Dytiscidae. It is found in North America.

Laccophilus undatus adolah kumbang dari famili Dytiscidae. Spesies ko juo marupokan bagian dari ordo Coleoptera, kelas Insecta, filum Arthropoda, dan kingdom Animalia.

Laccophilus undatus là một loài bọ cánh cứng trong họ Bọ nước. Loài này được Aubé miêu tả khoa học năm 1838.