REDIA, 101, 2018: 31-33 (*) Department of Agriculture and Forestry Sciences (DAFNE), University of Tuscia, Viterbo, Italy (**) Via De Gasperi 10, Viterbo, Italy (°) Corresponding author: olmimassimo@gmail.com Guglielmino A., Olmi M., Speranza S. – Description of Gonatopus xui sp. n. from India (Hymenoptera Dryinidae). A new species of Dryinidae (Hymenoptera: Chrysidoidea) is described from India: Gonatopus xui sp. n. It is the first species of Dryinidae reported from Himachal Pradesh. The new species belongs to group 7 of Gonatopus. The key to the females of the Oriental species of Gonatopus group 7 is modified to include the new taxon. The new species is named after the late Professor Zaifu Xu, from Guangzhou (China), well-known specialist of Chinese dryinids. KEY WORDS: Gonatopodinae, Himachal Pradesh, Oriental region, taxonomy, keys. ADALGISA GUGLIELMINO (*) - MASSIMO OLMI (**) (°) - STEFANO SPERANZA (*) DESCRIPTION OF GONATOPUS XUI SP. N. FROM INDIA (HYMENOPTERA DRYINIDAE) INTRODUCTION Dryinidae of the Oriental region were studied in recent years by XU et al. (2013). Their monograph was followed by sup- plements published by GUGLIELMINO & OLMI (2013), KIM et al. (2013), OLMI et al. (2013, 2014, 2015a, 2015b, 2015c, 2016), MITA & PHAM (2014), GUGLIELMINO et al. (2017), MITA et al. (2017). In the Oriental region, the genus Gonatopus Ljungh, 1810, includes 59 species (XU et al., 2013; MITA et al., 2017), among which 20 are reported from India. In 2017 the authors have examined a further new species of Gonatopus collected in India. It is described below. MATERIALS AND METHODS The description follows the terminology used by OLMI (1984) and XU et al. (2013). The measurements reported are rela- tive, except for the total length (head to abdominal tip, without the antennae), which is expressed in millimeters. In the descrip- tions POL is the distance between the inner edges of the lateral ocelli; OL is the distance between the inner edges of a lateral ocellus and the median ocellus; OOL is the distance from the outer edge of a lateral ocellus to the compound eye. The term “metapectal-propodeal complex” is here used in the sense of KAWADA et al. (2015). It corresponds to the term “metathorax + propodeum” sensu OLMI (1984) and XU et al. (2013). The types of all Oriental species of Gonatopus were exam- ined. The material studied in this paper is deposited in the following collections: TAMU: Department of Entomology, Texas A. & M. University, College Station, Texas, USA. USNM: National Museum of Natural History, Washington, DC, USA. RESULTS Gonatopus xui sp. n. (Fig. I, 1-2; Fig. II, 1) MATERIAL EXAMINED Holotype, 1 female: INDIA: Himachal Pradesh, Kothi Village and environs, IN-11, 32°18’N 77°11’E, 2300-2600 m, 29.V-8.VI.1999, Yu. M. Marusik leg. [TAMU (to be transferred to USNM)]. DESCRIPTION Apterous female; length 4.2 mm. Head black, except mandible, clypeus, gena and anterior region of face testaceous; antenna brown, except antennomeres 1-2 testaceous; mesosoma black; metasoma brown; legs brown, except tarsi and part of trochanters testaceous. Antenna clavate; antennomeres in following pro- portions: 9:5:17:11:8:8:6:6:6:9. Head excavated, shiny, unsculp- tured; frontal line complete; occipital carina incomplete, only present behind ocellar triangle; POL = 1; OL = 2; OOL = 9. Palpal formula 5/3. Pronotum crossed by strong transverse impression, with anterior collar and disc shiny, punctate, unsculptured among punctures. Scutum shiny, sculptured by many longitudinal striae, laterally with two pointed apophyses (Fig. I, 1). Scutellum shiny, smooth, flat. Mesopleuron shiny, unsculptured. Metanotum slightly hollow behind scutellum (Fig. I, 2). Metapectal-propodeal complex shiny, with disc and anterior surface unsculptured; posterior surface trans- versely striate. Metapleuron with anterior half unsculptured and posterior half transversely striate. Meso-metapleural suture very thin, slightly distinct and complete. Protarsomeres in following proportions: 16:3:5:18:26. Enlarged claw (Fig. II, 1) with one small subapical tooth and one row of five peg- like setae, in addition to one bristle. Segment 5 of protarsus (Fig. II, 1) with one row of 20 lamellae; distal apex with about 10 lamellae. Tibial spurs 1/0/1. Male: unknown. DISTRIBUTION Only known from the type locality (see above). HOSTS Unknown. ETYMOLOGY The species is named after the late Prof. Zaifu Xu, spe- cialist of Chinese dryinids and author, with Prof. Junhua He, of the monograph on Dryinidae of the Fauna Sinica (HE & XU, 2002). REMARKS The female of the new species is apterous, with pronotum crossed by a strong transverse furrow, the enlarged claw – Received 1 February 2018 Accepted 9 March 2018 http://dx.doi.org/10.19263/REDIA-101.18.05