A new species of Acrosternum Fieber, subgenus Chinavia Orian, from Cuba (Hemiptera: Pentatomidae)
1987; BioOne; Volume: 95; Linguagem: Inglês
ISSN
1937-2361
Autores Tópico(s)Coleoptera: Cerambycidae studies
Resumo-A description is provided for Acrosternum (Chinavia) cubensis, n. sp. New locality records are given for A. wygodzinskyi Rolston from Puerto Rico. A key to the eight species of Acrosternum known to occur in the West Indies is provided. The genus Acrosternum Fieber, 1860, belongs to the group of pentatomine genera having on the ventral surface of the second visible abdominal segment an anteriorly directed spine or tubercle which is unapposed by an elevated metasternum. Such genera occurring in the Western Hemisphere are keyed by Rolston and McDonald (1981). The New World species of Acrosternum, subgenus Chinavia Orian, 1965, were recently revised by Rolston (1983). and Rolston (1986) described 3 new species of Acrosternum from Mexico and provided a key to the species occurring in Mexico. Also, the previously unknown male of A. istum Rolston was described by (1986). Since the revision by Rolston, an undescribed species has been discovered from Cuba. A key is provided here for the identification of species of Acrosternum occurring in the West Indies. KEY TO WEST INDIES SPECIES OF ACROSTERNUM 1. Abdominal spine projecting past middle of mesocoxae ...... 2 Abdominal spine not reaching beyond anterior margin of metacoxae ..... ....... 3 2(1). Lateral margins of head black; each humeral angle rounded, not produced laterally beyond base of corium (Jamaica; Cayman Island) ....... sparnium (Dallas) Lateral margins of head reddish-yellow; each humeral angle right-angular, produced laterally beyond base of corium by more than half the width of an eye (Hispaniola) insulani Rolston 3(1). Each ostiolar ruga extending only 0.5-0.6 distance from mesial margin of ostiole to lateral margin of thorax 4 Each ostiolar ruga extending 0.7-0.8 distance from mesial margin of ostiole to lateral margin of thorax . 6 4(3). Abdominal tubercle reaching middle of metacoxae; each spiracle unattended by a yellow callus (Bahama Islands) euri Rolston Abdominal tubercle barely attaining posterior limit of metacoxae; each spiracle located on or near a conspicuous yellow callus 5 5(4). Proximal ends of tibiae green; each spiracle located just outside posterolateral margin of yellow callus (Fig. 5); rostrum reaching beyond middle of metacoxae (Cuba) ... cubensis, n. sp. This content downloaded from 157.55.39.91 on Thu, 22 Sep 2016 07:19:28 UTC All use subject to http://about.jstor.org/terms 1987 A NEW SPECIES OF ACROSTERNUM 299 Proximal ends of tibiae crimson; each spiracle located within posterolateral margin of yellow callus (Fig. 6); rostrum not reaching anterior margin of metacoxae (southern Mexico into Panama; Hispaniola) montivagum (Distant) 6(3). Abdominal tubercle barely attaining posterior limit of metacoxae (Hispaniola; South America; Galapagos Islands) ubicum Rolston Abdominal tubercle reaching middle of metacoxae 7 7(6). Connexiva with black macule at each posterolateral angle confined to edge of sternite, not expanding onto laterotergite (Fig. 7); each spiracle usually surrounded by a distinct yellow spot (Virgin Islands; Puerto Rico) ...... ........ wygodzinskyi Rolston Connexival spots at least on basal segments expanding onto laterotergites (Fig. 8); each spiracle unattended by yellow spot (southwestern United States to northern South America; Florida to Guadeloupe) marginatum (Palisot de Beauvois) Acrosternum (Chinavia) wygodzinskyi Rolston Fig. 7 Acrosternum (Chinavia) wygodzinskyi Rolston, 1983:142-144, figs. 124-127. In his revision of Acrosternum, Rolston described A. wygodzinskyi from St. Thomas and St. John Islands in the Virgin Islands, West Indies. Since this revision, a series of A. wygodzinskyi has been collected from Puerto Rico. The label data is PUERTO RICO: Guanica For., Hwy 333 nr. Playa Tamarindo 27-V-1986, E. G. Riley & D. A. Rider (13Y2, 5d6) and PUERTO RICO: Guanica Forest, Hwy 334 at Ranger Sta. 28-V-1986, E. G. Riley & D. A. Rider (23QY, 1 188). Acrosternum (Chinavia) cubensis, new species Figs. 1-5 Description. Dorsum medium green, except head, anterior one-third of pronotum, and anterior two-thirds of scutellum dark green; a few pale-yellow spots on interstices between punctures on coria and scutellum. Anterolateral margin of pronotum and margin of head pale yellow, apex of tylus fuscous. Dorsal punctation dense, dark green. Venter pale yellow, punctures green. Length excluding hemelytral membrane 11.2 mm. Head narrowly rounded apically; lateral margin of each juga sinuous, nowhere parallel. Length of head 2.1 mm, width across eyes 2.6 mm. Each antenna with segment 1 green; segments 2 and 3 dark violet-brown; segment 4 pale green except basal one-sixth violet-brown; segment 5 pale yellow-brown; distal one-half of segment 3 and segments 4 and 5 distinctly pilose; length of segments 1-5 about 0.4, 1.0, 1.2. 1.7, 1.7 mm. Pronotum 6.9 mm wide across humeri, mesial length 2.2 mm. Each humeral angle narrowly rounded, almost angular, distinctly produced beyond base of corium, but by less than half the width of an eye (Fig. 1). Anterolateral margin of pronotum straight. No black on cicatrices. Scutellum 4.3 mm wide at base, 4.8 mm long, with 5 equally spaced white spots along base. No black on basal corners of scutellum. Corium rounded apically, reaching beyond middle of sixth (fifth visible) abdominal segment. Connexivum pale green, no black on posterolateral angles. Rostral segments 2-4 about 1.4, 1.1, 0.8 mm, ventral surface with median black This content downloaded from 157.55.39.91 on Thu, 22 Sep 2016 07:19:28 UTC All use subject to http://about.jstor.org/terms 300 JOURNAL OF THE NEW YORK ENTOMOLOGICAL SOCIETY Vol. 95(2)
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