Pandeleteius sahlbergi Howden

Howden, Anne T., 2011, On some species of Pandeleteius Schoenherr, 1834, in South America south of the tenth parallel (Coleoptera, Curculionidae: Entiminae: Tanymecini), Zootaxa 2977, pp. 50-60 : 56-57

Pandeleteius sahlbergi Howden , new species

Figs. 5, 6, 16–21, 22

Diagnosis. Resembling a pale Pandeleteius platensis , but noticeably differing as follows. Prothorax longer than wide, sides parallel. Elytra of male almost parallel-sided, only slightly wider at distal third; elytra of female inflated from basal sixth, 1.5 times wider at distal third. When present, swellings on elytral interval 3 higher than apical umbo, low and rounded, not conical. Profemur on inner edge smooth, lacking denticles. Male genitalia with aedeagus parallel-sided in dorsal view; apex elongate-elliptical; internal sac seen through aedeagus complex, two-fifths length of aedeagus, surrounding membranes spiculate.

Description. Holotype, male, length 3.7 mm, width 1.5 mm. Color: integument medium brown; scales shades of brown, tan, and white; white scales forming vitta on side of prothorax; small, irregular white spot on intervals 4 and 5 at basal fourth, with “V” on crest of elytra; remainder of dorsal surface brown. Setae of dorsal surface obscure, completely arched; sparse. Scales: very finely granulate, dense on dorsal surface of femora and tibiae; scales imbricate on sides of prothorax and elytral declivity; prosternum and procoxae moderately covered with large thin scales. Rostrum: as long as wide, narrower than head; median line indicated by slightly irregular separation of scales; interantennal line obsolete. Epistoma as wide as one-half anterior edge of rostrum, apex of epistoma separated from interantennal line by width of one scale; epistoma with posterior margin keeled, sides ogival, external edge of keel with some very small enameled scales. Scrobe reaching lower edge of eye, separated from eye by width of two to three scales. Eye moderately prominent, separated from dorsal surface by approximately three scales. Prothorax: 1.1 times longer than wide, in dorsal view sides very slightly rounded between basal and apical constrictions; in profile, apical constriction at midline approximately two times longer than basal constriction; disc of pronotum flat. Pronotum with pair of very slight, short, transverse depressions; foveae sparse; with four or five postocular vibrissae. Scutellum: approximately size of one large scale; with one small scale. Elytra: 2.1 times longer than prothorax, 1.2 times wider across humeri than across prothorax. In dorsal view, sides slightly divergent to distal third, then gradually rounded to apex, apex broadly rounded; apical umbo distinct. At greatest width, elytra 1.2 times wider than across humeri; in profile, elytra flat, gradually elevated to apical third; summit of declivity at apical sixth, there deflected to apex, intervals 9 and 10 vertical. Elytral intervals 3, 5, and 7 slightly wider than other intervals; interval 3 gradually elevated from middle to just before elytral declivity; intervals 5 and 7 with shorter, 1ower elevation; intervals 4, 5, and 7 terminating in moderate umbo on declivity. Legs: procoxae separated by approximately greatest width of scape. Profemur moderately, gradually enlarged, 1.2 times longer than metafemur, 1.6 times wider than metafemur. Protibia almost straight, inner edge with five acute equidistant teeth. Ventral surface: ventrite 5 1.9–2.0 times wider than long; very slightly convex medially; explanate margin present on sides only; surface of ventrite 5 squamose on basal half. Genitalia: aedeagus approximately as long as abdomen, slightly narrowed basally, gradually tapered to distal third, apex ending in minute hook; in profile, approximately distal two-thirds straight. Internal sac with darkly sclerotized tube connected to aedeagus by densely, minutely spiculate membrane.

Allotype, female, length 4.5 mm, width 2 mm; differs from holotype as follows. Older specimen with darker integument; elytra with conspicuous line of scales from humeral fifth, abruptly curving to interval 5 at basal twofifths; with wide diagonal band of dark brown scales between intervals 3 and 7 abutting narrow band of white scales. Profemur as wide as rostrum. Prothorax in profile dorsal surface longer than ventral surface. Elytra 2.6 times longer than prothorax; 1.3 times wider across humeri than across prothorax. In dorsal view, sides of elytra briefly, slightly divergent; thence divergent in straight line to apical umbo at distal sixth, umbo conspicuous, prominent; at greatest width, 1.5 times wider than across humeri. Ventral surface: sternite 5 2.0 times wider than long; explanate margin almost continuous on basal half of ventrite 5. Genitalia: distal coxite deformed, 0.3 mm long. Vagina with proximal end with two pairs of blade-like rods 0.75 mm; distal end with pair of ornate sclerites with minute spicules similar to those of internal sac of male. Spermathecal duct approximately 2.5 mm long, sternite 8 1.37 mm long.

Type series. Holotype: male, Rolandia, Paraná, Brazil, X.1947 ( AMNH). Allotype: female, Caviuna, Paraná, Brazil, I 1946, A. Maller, Coll. Frank Johnson Donor ( AMNH). Paratypes: 5 males, 12 females. ARGENTINA. Misiones: 1 male, “Arg. Misiones, Pindapoy, Jan. 1943, P. Bridarolli” ( CMNC). BRAZIL. 1 female, (no locality data), 4997, on minute yellow triangle, Pascoe Coll. 93-60 ( BMNH). Minas Gerais: 1 female, Albuquerque de Castelnau, 1847; 1 female, minute black triangle, Santa Rita, Aug (?) 1850, Sahlberg, Sharp Coll. 1905-313 ( BMNH). Paraná: 1 male, pink oval, Pascoe Coll. B.M. 1893-60 ( BMNH); 1 female, Caviuna, IV-1945, A. Maller, Coll. Frank Johnson Donor ( CMNC); 1 female, Rolandia, XI-1947, A. Maller, Coll. Frank Johnson Donor ( AMNH); 1 female, P. Grossa, Pedreira G[obscured by pin]chuva, 9-44, 2041, Colecão F. Justos Jor, Dpto. Zool. UF-Paraná ( DZUP); 1 female, Curitiba, 16-II-66, C. Ext. D.Z. U.F.P. ( DZUP). Santa Catarina: 1 male, Nova Teutonia, 27°–11'B, 52°–23'L, I 1974, 300– 500 m, Fritz Plaumann, Depto. Zool., UF-PARANA ( DZUP). São Paulo: 1 male, 1 female, 55864, Campinas, A. Fry Coll. 1905-100 ( BMNH); 2 females, Cantareira, Halik, 1 XI 1938, 5525 (1), 8148 (1) Halik 1966 collection ( USNM); 1 female, Vila Amalia, S.Paulo-Capitol 21.IV.1960, J. Halik, 16757, Halik 1966 collection ( USNM); 1 male, São Paulo, Bras Mraz, Mus Pragense LGT ( NMPC).

This species is known from Argentina (Pindapoy) and south eastern Brazil from Santa Catarina to southern Minas Gerais states ( Fig. 22 ).

Variation. Male paratypes are 3.2–4.8 mm long and 1.2–1.8 mm wide; female paratypes are 3.1–4.8 mm long and 1.5–2.4 mm wide. The color pattern on the distal declivity of the elytra is often white, but the dorsal surface of the elytra varies considerably. On one male from Paraná the basal half of the dorsal surface of the elytra is entirely white. On two specimens (one each from Santa Catarina and Curitiba) interval 3 is much more prominent than on the other females.

Etymology. The new species, Pandeleteius sahlbergi , honors R. F. Sahlberg, professor at the University of Helsinki. A review of Sahlberg’s work is given by Nelson Papavero (Papavero 1973) in which he relates that Sahlberg in 1849 “undertook at his own expenses a trip to Brazil.” He collected in “the interior of the Provinces of Rio de Janeiro and Minas Gerais from Chapeu d’Uvas to Diamantino...” “Martins had specimens collected by Sahlberg in Santa Rita, on August 1850.”

Figures

FIGURE 22. Map of collection localities for Pandeleteius griseus (black dots) and P. s a h l b e rg i (grey dots).