Belostoma dallasi De Carlo, 1930

Ribeiro, Josė Ricardo Inacio, 2007, A review of the species of Belostoma Latreille, 1807 (Hemiptera: Heteroptera: Belostomatidae) from the four southeastern Brazilian states, Zootaxa 1477 (1), pp. 1-70 : 25

Belostoma dallasi De Carlo, 1930

( Figs 6M–P ; 17D ; 23A )

Zaitha anurus: Berg 1879 (probably in part): 192.

Belostoma boscii: Kirkaldy & Torre-Bueno 1909 (in part): 190.

Belostoma dallasi De Carlo, 1930: 114 , plate V ( Fig. 12 ).

Belostoma bosci: De Carlo 1960 (according to Lauck 1962): 54, 57 ( Figs 21 –26).

Types.—According to De Carlo (1930), Lauck (1962), and Schnack (1976), B. dallasi was described based on a male holotype and a female paratype [locality not mentioned] deposited in MLPA, and on paratypes (Salta Province, Argentina) in MACN, and Lizer’s and Trelles’ collections. These specimens have not been examined.

Material examined.— BRAZIL. Ceará — * 1 m ( DPIC): Praia de Lagoinha , 07.VII.1999, (M. H. Pereira), A. L. Melo det. 1999. Minas Gerais — * 1 m ( DPIC 1821 ): Itacambira, Peruaçu River , 24.XI.1997, (A. L. Melo), N. Nieser det.

Distribution.— ARGENTINA: Salta ( De Carlo 1930). BRAZIL ( De Carlo 1960): Ceará (new record), Goiás ( Menke & Lauck 1962), Minas Gerais ( Nieser & Melo 1997). MÉXICO ( De Carlo 1960).

Description.—Measurements (m / f). Total length (from apex of head to apex of hemelytra at rest) 31.8– 34.6; largest width of body 13.8–14.5; median length of pronotum 5.43–6.00; greatest pronotal width 9.86– 10.71.

General coloration brown.

Body relatively slender. Length of anteoculus 0.91–0.97 times length of interoculus; length of rostral segment I 1.20–1.29 times length of segment II; anterior frontogenal suture equal to or longer than posterior frontogenal suture; clypeus reaching ocular line or not (0–0.21 mm); vertex without longitudinal median carina; posterior interocular width 1.15–1.29 times length of anteoculus, and 1.33–1.39 times width of eye; eyes rounded. Pronotum without longitudinal median carina; greatest pronotal width 1.79–1.82 times its length; scutellum reaching nodal line, with weakly longitudinal median carina posteriorly; prosternal keel prominent, slightly triangular, rounded at apex ( Fig. 6M ). Pilosity not extending along genital operculum, covering part of connexivum.

Male genitalia ( Fig. 6N–P ).—Dorsal arms short, converging, narrowed apically in dorsal view; ventral diverticulum with dorsal caudal protuberance in dorsal and lateral views, and with developed ventroapical protuberance in lateral and ventral views; caudal lateral margins of ventral diverticulum convex, not sinuous in ventral view; width of ventral diverticulum 1.3 times its length in ventral view.

Comparative notes.—According to Nieser and Melo (1997), B. dallasi differs from B. anurum because in the latter the anteoculus is longer than the interoculus. Moreover, the width of the ventral diverticulum of B. anurum is twice its length in ventral view.

Figures

FIGURE 6. Belostoma cummingsi De Carlo, 1935 and B. dallasi De Carlo, 1930. B. cummingsi. 6A–C, Prosternal keel (lateral view): 6A, Specimen from São Paulo (SEMC). 6B, Specimen from Rio Grande do Sul (SEMC). 6C, Specimen from Santa Catarina (SEMC). 6D–L, Phallus: 6D–F, Specimen from Rio Grande do Sul (SEMC). 6G–I, Specimen from Rio Grande do Sul (MACN 49963). 6J–L, Specimen from São Paulo (SEMC 28329). B. dallasi. 6M, Prosternal keel (lateral view): specimen from Ceará (DPIC). 6N–P, Phallus: Specimen from Minas Gerais (DPIC 97042). 6D, 6G, 6J, and 6M, Dorsal views. 6E, 6H, 6K, and 6N, Ventral views. 6F, 6I, 6L and 6O, Lateral views. Scale bar: 1.00 mm.

FIGURE 12. Belostoma micantulum (Stål, 1860) and B. plebejum (Stål, 1860). B. micantulum. 12A–B, Prosternal keel (lateral view): 12A, Specimen from Suriname (MACN); 12B, Specimen from Corrientes, Argentina (MACN 50331). Scale: 0.50 mm. 12C–E, Phallus: specimen from State of Pará (AMNH). Scale: 1.00 mm. B. plebejum. 12F, Prosternal keel (lateral view): specimen from State of Bahia (AMNH). 12G–O, Phallus: 12G–I, Specimen from State of Bahia (AMNH). 12J–L, Specimen from State of Minas Gerais (AMNH). 12M–O, Specimen from State of Rio de Janeiro (DZRJ 22). Scale bar: 1.00 mm. 12C, 12G, 12J, and 12M, Dorsal views. 12D, 12H, 12K, and 12N, Ventral views. 12E, 12I, 12L, and 12O, Lateral views. (MED) median depression.

FIGURE 17. Dorsal habitus. 17A, Belostoma candidulum Montandon, 1903: specimen from State of São Paulo (SEMC). 17B, B. costalimai De Carlo, 1938: specimen from State of Roraima (AMNH). 17C, B. cummingsi De Carlo, 1935: specimen from State of São Paulo (MACN 37791). 17D, B. dallasi De Carlo, 1930: specimen from State of Ceará (DPIC). Scale bar: 5.00 mm.

FIGURE 21. Dorsal habitus. 21A, Belostoma stollii (Amyot & Serville, 1843): specimen from State of Amazonas (SEMC 9). 21B, B. testaceopallidum Latreille, 1807: specimen from State of Rio de Janeiro (MACN 3680). Scale bar: 5.00 mm. (LOC) longitudinal carina.

FIGURE 23. Geographic distribution map of Belostoma species in southeastern Brazil. 23A, = B. costalimai, = B. cummingsi, = B. dallasi. 23B, = B. dentatum, = B. dilatatum, = B. discretum, = B. elongatum.