Eurystylus

Yasunaga, Tomohide, Nakatani, Yukinobu & Chérot, Frédéric, 2017, Review of the mirine plant bug genus Eurystylus Stål from Japan and Taiwan (Hemiptera: Heteroptera: Miridae: Mirinae), with descriptions of two new species, a new synonymy and a new combination, Zootaxa 4227 (3), pp. 301-324 : 307

Key to Eurystylus species known from Japan and Taiwan

1. Pronotum almost entirely fuscous, concolorous, without noticeable pale portion or macula ( Fig. 3 H, J)...... E. jingfui n. sp.

- Pronotum grayish brown, pale brown, or brown, usually with a pair of darker spots on disk...........................2

2. A pair of dark spots on pronotum surrounded by pale margin, clearly ocellate ( Fig. 2 A); final-instar nymph with four or five pairs of clear, ocellate spots on abdominal sterna II–VII ( Fig. 2 B)................................... E. coelestialium

- A pair of dark spots obscure, ovoid, narrowed ( Fig. 1 E–F) or sometimes absent ( Fig. 3 A); final-instar nymph usually with two pairs of ocellate spots on abdomen ( Fig. 2 C–D)..............................................................3

3. Antennal segment III entirely dark, without pale base; paired spots on pronotum ovoid and comparatively clear ( Fig. 1 D; 3E); corium and clavus speckled with grayish, mossy patterns ( Fig. 3 E); final-instar nymph with almost uniformly whitish or yellowish body, antennae and legs ( Fig. 2 D)................................................... E. ryukyus n. sp.

- Base of antennal segment III always pale; paired spots on pronotum elongate and obscure ( Fig. 1 , E–F), sometimes reduced or obliterated ( Fig. 3 A); hemelytron speckled with small, pale spots, without mossy pattern ( Fig. 3 , A, C); final-instar nymph generally pale brown, partly tinged with red, with apical parts of antennal segment II and femora reddish brown ( Fig. 2 C)................................................................................................. E. sauteri

Figures

FIGURE 1. Habitus images of Eurystylus species. A. Male adult from Chitwan, Nepal, identical to E. jingfui n. sp. B – C. E. ryukyus n. sp., female on Fraxinus griffithii. D. E. sauteri, female on Solidago canadensis, with Taylorilygus apicalis (Fieber) (upper) and Nysius plebeius Distant (middle). E – G. Ditto, male (E, G) and female (F) on Ligustorum japonicum. H, Ditto, head (velvety spots arrowed).

FIGURE 2. Habitus images of adult females and final-instar nymph (B – D) of Eurystylus species. A – B. E. coelestialium (image courtesy of M. Takai). C. E. sauteri Poppius. D. E. ryukyus n. sp. E. E. burmanicus from Chitwan, Nepal. F. E. costalis from Kathmandu Valley, Nepal.

FIGURE 3. Habitus images of dry-preserved specimens for E. sauteri (A – D), E. ryukyus n. sp. (E – G) and E. jingfui n. sp. (H – K).