Xanthocomus rutilans ( Casey, 1916 ) Gimmel, 2011

Gimmel, Matthew L., 2011, Review of the species described in Leptostilbus Casey in North America (Coleoptera: Phalacridae: Xanthocomus Guillebeau), Insecta Mundi 2011 (188), pp. 1-8 : 2-5

Xanthocomus rutilans ( Casey, 1916) , comb. nov.

Leptostilbus rutilans Casey 1916: 72 .

Diagnosis. May be distinguished from X. concinnus by the presence of obvious punctures in the (especially second and third) elytral intervals, especially at about midpoint of elytra ( Fig. 3 ). The male hind tibiae are also modified such that the apical spurs are stouter and directed more medially. The aedeagus provides the most reliable characters for separation ( Fig. 5, 6 ), including the fused parameres (movable apical portion of tegmen) without a median cleft, and the apex of the penis not acutely pointed medially. The main character presented by Casey to separate the two species, namely the extent of the stiff setae at the apex of the prosternal process, is subject to variation due to abrasion.

Type material. Eight syntypes in USNM, lectotype here designated in order to stabilize the species and generic names, point-mounted male with genitalia removed and mounted in DMHF on an acetate card on the same pin, “Brownsville \ Texas \ Wickham // CASEY \ bequest \ 1925 // rutilans 7 \ PARATYPE USNM \ 48982 [species name and numbers handwritten] [red label] // LECTOTYPE \ Leptostilbus \ rutilans Casey \ des. M.L. Gimmel 2010 [red label]” ( Fig. 1 ) ( USNM). Paralectotypes (6): 5 with labels “Brownsville \ Texas \ Wickham // CASEY \ bequest \ 1925 // rutilans [numeral corresponding to paratype number] \ PARATYPE USNM \ 48982 [species name and numbers handwritten] [red label] // PARALECTOTYPE \ Leptostilbus \ rutilans Casey \ det. M.L. Gimmel 2010 [yellow label]” ; 1 with labels “ Brownsville \ Texas \ Wickham // CASEY \ bequest \ 1925 // TYPE USNM \ 48982 [number handwritten] [red label] // Leptostilbus \ rutilans \ Csy. [handwritten] // PARALECTOTYPE \ Leptostilbus \ rutilans Casey \ det. M.L. Gimmel 2010 [yellow label]” .

Other material examined (n=98). USA: ARIZONA: Cochise Co.: Chiricahua Mountains , 16 Jul 1938, R.I. Sailer (1, SEMC) ; FLORIDA: DeSoto Co.: Nocatee , 06 Dec 1988, sweeping, K.E. Jenkins (1, FSCA) ; Highlands Co.: Lake Placid , 08 Dec 1959, A.M. Nadler (1, AMNH) ; Hillsborough Co.: Ruskin , 26 Jan 1989, in palms, J. Shirley & P. Forkgen (1, FSCA) ; Indian River Co.: Vero Beach , 12 Dec 1974, at light, M.C. Thomas (1, FSCA) ; same but 18 Feb 1975 (1, FSCA) ; Miami-Dade Co.: Miami Beach , 15 Feb 1940 (1, FMNH) ; Homestead , 20 Aug 1952, M.H. Hatch (1, OSAC) ; same but 30 Apr 1955 (2, OSAC) ; 6 miles N of Homestead , 15 Jul 1972, beating, M. Druckenbrod (2, USNM) ; Monroe Co.: Matecumbe , Nov 1931, Siepmann (1, FMNH) ; Long Key , 23 Jul 1948, L.B. Beamer (1, SEMC) ; Key Largo , 26 Feb 1956, H.V. Weems, Jr. (1, FSCA) ; Upper Key Largo , 23-24 Jul 1984, E.G. & T.J. Riley (1, TAMU) ; Big Pine Key , 06 Jan 1977, W.E. Steiner (1, USNM) ; Fleming Key , 15-16 May 1979, insect flight trap, J.A. Acree & H.V. Weems, Jr. (1, FSCA) ; Everglades National Park, Flamingo , 12 May 1990, E.G. Riley (4, TAMU) ; Saint Lucie Co.: Saint Lucie , 12 Dec 1980, L.E. Watrous (1, FMNH) ; TEXAS: Cameron Co.: Sabal Palm Grove Sanctuary , 19-20 Jun 1981, blacklight trap, R. Turnbow & E. Ortiz (1, TAMU) ; Sabal Palm Grove Sanctuary , 02 May 1982, R. Turnbow (1, TAMU) ; same except 04 Oct 1986, E. Riley & J. Negrón (1 [disarticulated], LSAM) ; same except 05 May 1989, E. Riley (1, TAMU) ; same except 18 Oct 1989, N.M. Downie (1, FMNH) ; same except 20 Oct 1990, T. Carlow & E. Riley (1, TAMU) ; same except 16 Oct 1993, UV light, Backmon, Quinn & Riley (2, TAMU) ; Sabal Palm Grove Sanctuary , 16-17 Oct 1993, E.G. Riley (10, TAMU) ; same except 08 Apr 1994 (8, TAMU) ; same except 23 Apr 1994, UV light (10, TAMU) ; Sabal Palm Grove Sanctuary , 10 Oct 1994, E.G. Riley-13 (2, TAMU) ; Sabal Palm Grove Refuge (site 7), 25.85125°N, 97.41864°W, 20 Sep 2008, palm forest margin, E.G. Riley-108 (5, TAMU) ; Sabal Palm Grove Refuge (site 9), 25.85092°N, 97.41604°W, 21 Sep 2008, re-vegetated area, E.G. Riley- 111 (1, TAMU) ; Sabal Palm Grove Refuge (site 8), 25.85158°N, 97.42028°W, 18 Oct 2008, palm forest margin, resaca bank, E.G. Riley-277 (3, TAMU) ; same except 16 May 2010, E.G. Riley-1995 (1, TAMU) ; Sabal Palm Grove Refuge (site 11), 25.85601°N, 97.41726°W, 18 Oct 2007, beating dead palm fronds, E.G. Riley-279 (3, TAMU) ; Sabal Palm Grove Refuge (site 1), 25.84799°N, 97.41881°W, 21 May - 05 June 2009, UV light, palm forest, E.G. Riley-1037 (1, TAMU) ; Laguna Atascosa NWR (site 1), 26.22375°N, 97.35454°W, 25 Mar 2009, dense coastal brush, beating, J. King & E. Riley-594 (1, TAMU) ; vicinity Southmost School , 01 May 1979, C.L. Smith (1, UGCA) ; Brownsville , 01 Jun 1904, H. Barber (1, USNM) ; same but 08 Jun 1934, J.N. Knull (1, OSUC) ; same but 08 May 1935 (1, OSUC) ; same but 07 Apr 1950, D.J. & J.N. Knull (1, OSUC) ; same but 04 Jul 1939, J. Russel (1, SEMC) ; same but 04 Mar 1936, on cotton roots in soil, P.A. Glick (1, TAMU) ; same but 06 March 1936 (1, TAMU) ; Hidalgo Co.: Santa Ana National Wildlife Refuge, Willow Lake , 13 m, 26°04[.]832´N, 98°08[.]458´W, 07 Feb 2005, C.L. & S.L. Staines (1, USNM) ; same except Jaguarundi Trail , 23 m, 26°03[.]727´N, 98°08[.]458´W, 09 Feb 2005, C.L. & S.L. Staines (6, USNM) ; Santa Ana National Wildlife Refuge , 25 m, 26°05[.]041´N, 98°08[.]194´W, 22 Jan 2005, blacklight, C.L. & S.L. Staines (1, USNM) ; Lower Rio Grande Valley NWR, La Coma (site 2), 26.05611°N, 98.03635°W, 09 Apr 2009, re-vegetated site, beating, J. King & E. Riley-697 (1, TAMU) ; same except 23 Apr 2009 and J. King & E. Riley-806 (2, TAMU) ; San Patricio Co.: Welder Wildlife Refuge , 27 Sep 1976, blacklight trap, R. Turnbow (1, FSCA) ; Willacy Co.: Lower Rio Grande National Wildlife Refuge, East Lake Tract , 22 m, 2[6]°31[.]462´N, 97°52[.]291´W, 25 Jan 2005, C.L. & S.L. Staines (2, USNM) .

Distribution ( Fig. 9 ). Restricted to subtropical portions of the United States, southern Florida, southern Texas, and southeastern Arizona. The species also occurs south to at least Venezuela and Trinidad.

Figures

Figures 1-4. Xanthocomus spp. lectotype labels and dorsal habitus. 1,3) X. rutilans (Casey). 2,4) X. concinnus (Casey).

Figures 5-8. Aedeagus of Xanthocomus spp. 5-6) X. rutilans (Cameron Co., Texas). 5) Tegmen, ventral aspect. 6) Penis, ventral aspect. 7-8) X. concinnus (West Feliciana Par., Louisiana). 7) Tegmen, ventral aspect. 8) Penis, ventral aspect. Scale bars = 0.5 mm.

Figures 9-10. Distribution of Xanthocomus spp. in North America (star = type locality; square = state record only). 9) X. rutilans. 10) X. concinnus.