Thyanta (Thyanta) calceata (Say)

Rider, David A. & Chapin, J. B., 1992, Revision of the genus Thyanta Stal, 1862 (Heteroptera: Pentatomidae) II. North America, Central America, and the West Indies., Journal N Y Ent Soc 100 (1), No. 1, pp. 42-98 : 46-50

Thyanta (Thyanta) calceata (Say)

Figs. 1-15, Map 1

Pentatoma calceata Say, 1831:8 .

Thyanta custator (ofauthors, not Fabricius): Herrich-Schaffer, 1844:96, 106, fig. 771; Uhler, 1886:7 (part); Lethierry and Severin, 1893: 148 (part); Kirkaldy, 1909:94 (part); Banks, 1910:90 (part).

Thyanta custator calceata: Uhler, 1872:399 .

Thyanta calceata: Barber, 1911: 108- 111 ; Van Duzee, 1917:53; Hart, 1919:184, 217, fig. 70; Blatchley, 1926:113, 117-118; Torre-Bueno, 1939:231; Ruckes, 1957a:21- 22; Hoffman, 1971:44; Furth, 1974:22, 23-24; McPherson, 1982:76-77, 79-80, fig. 72; Rolston and McDonald, 1984:figs. 23, 27; Froeschner, 1988:593.

Diagnosis. General form broad, ovate. Transhumeral rubiginous band usually present; vertex of head and tylus often reddish.

Lateral jugal margins nearly parallel for middle third of distance from eyes to apex ( Fig. 2). Humeral angles rounded to angulate; anterolateral pronotal margins piceous, straight to weakly concave in dorsal view (Fig. l); mesial angle of each pronotal cicatrice piceous. Each abdominal sternite with postspiracular spot on each side and posterolateral angles piceous.

Mesial margins of basal plates in caudoventral view slightly concave; posterior margins sinuous; posteromesial angles rounded ( Fig. 13). Posterolateral angles of pygophore continuing onto posteroventral surface as vague carinae, forming semicircular impression in caudoventral view. Posterior margin of pygophore produced posterodorsad, in ventral and dorsal views appearing convex with small, medial, V-shaped emargination ( Figs. 10, 11); slightly concave in lateral view ( Fig. 12).

Types. The type specimen of Pentatoma calceata is apparently no longer in existence, and Say's original description (1831) will fit equally well for either T. calceata or T. custator. Previous usage has, however, fixed both species, and therefore designation of a neotype is not necessary.

Distribution. Eastern U.S. (Map 1).

Specimens examined. 1,105 specimens collected during every months of the year; deposited in AMNH, ARH, AUA, CAS, CNC, CUC, DAR, DBT, EGER, FMNH, FSCA, INHS, ISU, LRH, LSU, MSU, MSUE, NCSU, NDSF, OSUC, POLH, PUL, SIUC, SMEK, TAMU, UAT, UCB, UCR, UCS, UGA, UIM, UMC, USNM, VPI, WSU. UNITED STATES: Alabama: Autauga , Barbour , Bibb , Cherokee , Chilton , Clay , Cleburne , Coosa , Covington , Dallas , De Kalb , Elmore , Houston , Lee , Lowndes , Macon , Madison , Perry , Randolph , Shelby , Tallapoosa , Wilcox , Winston . Arkansas: Benton , Boone , Carroll , Grant , Hempstead , Hot Spring , Logan , Marion , Nevada , Newton , Polk , Sevier , Union , Yell . Connecticut: Litchfield , New Haven. District of Columbia . Florida: Collier , Holmes , Taylor . Georgia: Bartow , Bibb , Bryan , Chatham , Clark , Cobb , De Kalb , Floyd , Franklin , Fulton , Habersham , Hall , Harris , Johnson , Madison , Marion , Oconee , Oglethorpe , Paulding , Peach , Rabun , Sumter , Talbot , Thomas . Illinois: Champaign , Franklin , Hancock , Hardin , Jackson , Johnson , Pope , Union , Vermilion , Williamson . Indiana: Crawford , Howard , Porter , Tippecanoe . Iowa: Henry , Van Buren . Kansas: Bourbon , Douglas . Kentucky: Barren , Carter , Green , Laurel , Trigg . Louisiana: Allen , Acadia , Beauregard , Caddo , Calcasieu , Claiborne , De Soto , East Baton Rouge , East Feliciana , Grant , Jefferson Davis , Natchitoches , Rapides , Sabine , St. Landry , Tangipahoa , Vernon , Webster , West Feliciana , Winn . Maryland: Allegany , Anne Arundel , Calvert , Charles , Frederick , Montgomery , Prince Georges . Massachusetts: Bristol . Michigan: Wayne . Mississippi: Adams , Amite , Copiah , Forrest , Franklin , Jones , Lauderdale , Leake , Lincoln , Monroe , Newton , Oktibbeha , Panola , Perry , Pontotoc , Tallahatchie , Walthal . Missouri: Barry , Benton , Boone , Butler , Callaway , Camden , Carter , Crawford , Dade , Douglas , Greene , Harrison , Jackson , Laclede , Marion , McDonald , Montgomery , Osage , Ozark , Pettis , Phelps , Ralls , Randolph , St. Charles , St. Francois , Scotland , Scott , Shannon , Stone , Taney , Wright . New Jersey: Bergen , Gloucester , Morris . New York: Albany , Erie , Nassau , Orange , Su/folk , Ulster , Westchester . North Carolina: Buncombe , Columbus , Craven , Cumberland , Currituck , Harnett , Johnston , McDowell , Macon , Montgomery , Moore , Orange , Pender , Scotland , Wake . Ohio: Adams , Fair.field , Gallia , Hocking , Licking , Pickaway , Tuscarawas , Washington . Oklahoma: Craig , Latimer , McCurtain , Ottawa . Pennsylvania: Franklin , Lancaster , Philadelphia , Westmorland . South Carolina: Abbeville , Charleston , Chester.field , Dorchester , Florence , Greenville , Horry , Lexington , Oconee , Pickens , Spartanburg , Williamsburg . Tennessee: Cumberland , Decatur , De Kalb , Fentress , Knox , Lauderdale , Marion , Rhea , Scott , Sevier . Texas: Anderson , Angelina , Aransas , Bowie , Brazos , Camp , Cherokee , Dallas , Harris , Harrison , Jasper , Lamar , Sabine , Smith , Walker . Virginia: Charolette , Chesterfield , Clifton Forge City , Fairfax , Falls Church , Floyd , Gloucester , Hanover , King & Queen, Montgomery , Nelson , New Kent , Norfolk , Pulaski , Virginia Beach , Wythe . West Virginia: Monroe , Roane , Upshur .

Comments. Thyanta calceata can be separated from all other congeners except T. custator custator by the distinctly black anterolateral pronotal margins. It can be reliably distinguished from T. c. custator only by the male genitalia. In T. calceata, the pygophoral opening is subtended by a semicircular impression; this impression is rectangular in T. c. custator . Specimens of T. calceata are generally shorter and broader than specimens of T. c. custator , and the black markings on the anterolateral pronotal margins are usually darker and more extensive in T. calceata. These last two characters, however, may be apparent only when a series of specimens of each species can be compared.

Most species of Thyanta occur in two color forms, a green form in the warmer months and a brown form in the cooler months. This is particularly well documented in T. calceata ( McPherson, 1977a, b, 1978a, b; McPherson and Paskewitz, 1982; McPherson et al., 1983).