Xenoschesis Förster Known

Sheng, Mao-Ling, Sun, Shu-Ping & Wang, Tao, 2013, Xenoschesis Förster (Hymenoptera: Ichneumonidae) parasitizing webspinning and leafrolling sawflies with descriptions of four new species and a key to Chinese species, Zootaxa 3626 (4), pp. 543-557 : 544

Key to species of genus Xenoschesis Förster Known in China

1. Propodeum smooth, without transverse carina, with evenly arcuate dorsal profile from base to attachment of metasoma, without dorsal and posterior slanting profile. Ovipositor sheath approximately 0.5x as long as apical depth of metasoma....... 2

- Propodeum with posterior transverse carina, or wrinkles, or ridges, with dorsal and posterior slanting profiles. Ovipositor sheath approximately as long as apical depth of metasoma.................................................... 4

2. Fore wing without areolet. First tergum approximately 1.6x as long as apical width, without longitudinal groove. Second to seventh terga with dense, short, brown hairs. Coxae brownish black......... X. (Polycinetis) inareolata Sheng & Sun , sp. n.

- Fore wing with areolet. First tergum at least 1.7x as long as apical width, median portion with longitudinal groove........ 3

3. First tergum approximately 2.0x as long as apical width. Terga almost smooth, with fine, dispersed punctures ( Fig. 2 e). Antenna and hind femur blackish brown. Hind coxa black................. X. (Polycinetis) truncata Sheng & Sun , sp. n.

- First tergum approximately 1.6–1.7x as long as apical width. Terga smooth, shining, with fine, sparse, indistinct punctures. Antenna, hind coxa and femur reddish brown.................................. X. (Polycinetis) ustulata (Desvignes)

4. Hind leg black........................................................................................ 5

- Hind leg red, yellow or yellowish brown, at least coxae, trochanters and femora or trochanters, femora and tibiae yellow or yellowish brown......................................................................................... 6

5. Area petiolaris of propodeum smooth, shining, defined by distinct carina. Hind wing vein 1-cu shorter than cu-a. First tergum at least 1.6x as long as apical width. Fore and mid femora and tarsus ( Fig. 6 a) dark brown.................................................................................................... X. (Xenoschesis) crassicornis Uchida

- Area petiolaris of propodeum slightly rough, or with fine sparse indistinct punctures, defined by weak wrinkles or indistinct carina. Hind wing vein 1-cu as long as cu-a. First tergum 1.4–1.5x as long as apical width. Fore and mid legs ( Fig. 9 a) except coxae yellow to yellowish brown........................................ X. (Xenoschesis) weii Sheng & Sun , sp. n.

6. Area petiolaris of propodeum defined by distinct wrinkles. Lower-median portion of face with yellow spot. Hind coxa black. First trochanter and femur of hind leg red to yellowish red; trochantellus, apex of femur, tibia and tarsus yellow to yellowish brown ( Fig. 8 a)............................................... X. (Xenoschesis) tianzhuensis Sheng & Sun , sp. n.

- Area petiolaris of propodeum defined by carina. Face entirely black. Hind coxa, trochanter and femur red to brownish red ( Fig. 7 )................................................................... X. (Xenoschesis) fulvipes (Gravenhorst)

Figures

FIGURE 2. Xenoschesis (Polycinetis) truncata Sheng & Sun, sp. n. Holotype. 2 a. Body, lateral view. 2 b. Face. 2 c. Vertex. 2 d. Mesopleuron. 2 e. Second and third terga of metasoma. 2 f. Apical portion of metasoma, lateral view.

FIGURE 6. Xenoschesis (Xenoschesis) crassicornis Uchida, 1928. 6 a. Body, lateral view. 6 b. Cocoons.

FIGURE 7. Xenoschesis (Xenoschesis) fulvipes (Gravenhorst, 1829). Body, lateral view.

FIGURE 8. Xenoschesis (Xenoschesis) tianzhuensis Sheng & Sun, sp. n. Holotype. 8 a. Body, lateral view. 8 b. Face. 8 c. Vertex. 8 d. Mesopleuron. 8 e. Second and third terga of metasoma,. 8 f. Apical portion of metasoma, lateral view.

FIGURE 9. Xenoschesis (Xenoschesis) weii Sheng & Sun, sp. n. Holotype. 9 a. Body, lateral view. 9 b. Face. 9 c. Vertex. 9 d. Mesopleuron. 9 e. Apical portion of metasoma, lateral view.