Scaphoideus cinerosus Osborn, 1900

Dmitriev, Dmitry, 2009, Nymphs of some Nearctic leafhoppers (Homoptera, Cicadellidae) with description of a new tribe, ZooKeys 29 (29), pp. 13-33 : 19-20

Scaphoideus cinerosus Osborn, 1900 ( Fig. 2A )

Material. USA, 2 ♁, Illinois, Vermilion Co., 1.7mi S Muncie, 40°05'27" N, 87°50'11" W, 20 VI 2001 (Dietrich).

Description. Coloration pale brownish with brown color pattern. Crown pale with dark median longitudinal stripe divided into two parts by pale median line and broken by pale ecdysial line; with small spots laterally in front of eyes. Notum and abdomen with two stripes with ragged inner edges, these stripes fused together on abdominal tergite VII and at posterior margin of tergite VIII; lateral margins of abdominal tergites pale; tergites III–VI with large pale patch medially; setal areolae pale. Pronotum, mesonotum, and abdomen with narrow median stripe divided medially by pale median line. Pygofer with two large black spots laterally. Venter pale; apex of first hind tarsomere darkened. Body length 3.2–3.3 mm; head width 0.9 mm.

Notes. Nymphs of Scaphoideus titanus Ball , S. immistus (Say) , and S. major Osborn were illustrated by Barnett (1977), and the nymph of S. luteolus Van Duzee was illustrated by Oman (1949). Oman (1943) placed Scaphoideus and several related genera in the tribe Scaphoideini , but never validated this tribe providing a formal description. The group is considered nomen nudum (see Zahniser and Dietrich in press for details). The nymphs of Scaphoideini are very similar to the nymphs of Platymetopiina (Athysanini) , another poorly defined group recognized by some researchers (see Emeljanov 1999; Dmitriev 2006), but usually treated as a synonym of Athysanini (Zahniser and Dietrich in press). Th ey have similar body proportions, chaetotaxy, and color pattern. The only difference found so far is longer macrochaetae in the posterodorsal row of the hind tibia; these are usually much longer than macrochaetae in the anterodorsal row. Further investigation is needed to evaluate the status of Scaphoideini .

Tribe Cochlorhinini Oman, 1949

Description. Body slender. Head long; crown 2–3 times as long as pronotum, longer than wide, apex narrowly rounded, posterior margin slightly concave. Crown-face transition carinate; acrometope distinct. Face as long as wide or longer; anteclypeus parallel sided, 1.5–1.7 times as long as wide; lorum about as wide as anteclypeus, 1/2 of its inner margin bordered by postclypeus; postclypeus elongated, sometimes with faint median longitudinal carina in dorsal half. Gena with single hair like seta, its lateral margin slightly S-curved or straight. Antenna short, slightly extended beyond anteclypeus apex. Pronotum 3–3.5 times as wide as long, with lateral carina. Forewing pads 1.5 times as long as pterothorax medially. Fore tibia with 4 longitudinal rows of macrochaetae: anteroventral row with numerous setae, increasing in size towards apex of tibia; anterodorsal, posterodorsal, and posteroventral rows with 4–5 macrochaetae each. Middle tibia with 4–5 macrochaetae in dorsal rows and 5–6 macrochaetae in ventral rows. Setal formula of hind femur 2+2+1. Hind tibia with 7–9 macrochaetae in dorsal rows, and 1– 3 intercalary setae among them, with pecten of setae at apex (setae II–IV are platellae, other setae regular). First hind tarsomere with platellae in anteroventral row and in distal pecten; one platella on the border between second and third tarsomere. Entire body covered with short setae. Pygofer 1.5–2 times as long as preceding tergites. Male gonapophyses triangular, about as long as wide, with narrowly rounded apices. Coloration yellowish, usually with two longitudinal stripes.

Figures

Figure 2. Nymphs of leafhoppers. A Scaphoideus cinerosus Osborn B Cochlorhinus pluto Uhler C same, face D Huleria quadripunctata Ball.