Dichochrysa arcuata, Kang-zhen & Wen-zhu & Jun-zhi & Xing-ke, 2004

Kang-zhen, Dong, Wen-zhu, Li, Jun-zhi, Cui & Xing-ke, Yang, 2004, Three New Species Of Dichochrysa (Insecta: Neuroptera: Chrysopidae) From China, With A Checklist Of Chinese Dichochrysa, Raffles Bulletin of Zoology 52 (1), pp. 67-74 : 69-70

Dichochrysa arcuata , new species

( Figs. 3 a-f)

Material examined. – Holotype – male, Yunnan Prov.: Hekoudaweishan, coll. Zhou Yao & Yuan Feng, 10 July.1974.

Paratype – 1 female, Yunnan Prov.: Eshan County, 1100m, coll. Yang Ji-Kun, 2 Apr.1981 .

Diagnosis. – Male adult (dried specimen). Length of body 10-12mm, of fore wings 11-12mm, of hind wings 9-10 mm. Head yellow, vertex protuberant, unmarked on the face. Palpi wholly yellow. Antennae longer than fore wings, scape yellow and dilated, slightly longer than wide or as long as wide; flagellum from yellow to brown gradually towards the apex. Pronotum yellowish-green, wider than long, narrow anteriorly and broad posteriorly like a trapezia; green in the lateral and ventral view; two anterior-angles arc-shaped, a shallow transverse vitta before posterior-margin. Meso- and metathroax green in the dorsal and lateral view, yellow in the ventral view. Legs wholly yellow, claws brown and strongly curved, squarely dilated at base ( Fig. 3a )

In fore wings, all veins of wings yellowish-green other than Cu 2. Pterostigma yellow and without crossvein; Costal crossveins 15, R-Rs crossveins 10, branches of Rs 10; Psm- Psc 8; Cell im triangular, r-m crossvein above it; Cu 1 and Cu 3 yellow, Cu 2 brown; number of gradates (inner/outer) =3/6. In hind wings, all veins green, costal crossveins 12; R-Rs crossveins 10; branches of Rs 9; Psm-Psc 5; number of gradates (inner/outer) = 2/4 (left wings) and 2/5 (right wings).

Abdomen yellowish-green in dorsal and lateral view, yellow in ventral view. 7 th tergite three times as long as 8 th tergite ( Fig. 3b ). Ectoproct small and callus cerci proximal to the inner margin. 8+9 sternum slender and faintly broad at base and slightly narrow at apex. Gonarcus broad on bottom and two lateral lobes expanded at apex ( Figs. 3c, d ). Entoprocessus bifurcated and like a “Y”. Pseudopenis bifurcated proximal to the bottom and tapered off. Two arms of tignum slender and arcessus small ( Fig. 3e ). Two lateral parts of gonapsis symmetrical and arcessus like a rod ( Fig. 3f ).

Etymology. – This new species is named according to arcshaped anterior angles of pronotum.

Remarks. – This species resembles Dichochrysa gradata Yang & Yang, 1993 , on the general form except that palpi of the latter are yellowish-brown, and yellow longitudinal mid-dorsal vitta is present on the thorax. In addition, the morphologic characters of entoprocessus, tignum and gonapsis of D. gradata are larger and broader than those of this species.

Distribution. – China: Yunnan.

Figures

Fig. 3. Dichochrysa arcuata, new species, male. a. claw; b. apex of abdomen in male; c. male genitalia, ventral view; d. male genitalia, lateral view; e. tignum; f. gonapsis.