Lycogaster rufiventris (Magretti)

Smith, David R. & Tripotin, Pierre, 2015, Trigonalidae (Hymenoptera) of Thailand, other southeastern Asian records, and a new Trigonalys from India, Journal of Hymenoptera Research 44, pp. 1-18 : 2-5

Lycogaster rufiventris (Magretti)

Figs 4-7

Trigonalys rufiventris Magretti 1897: 311, figs 2, 3; Carmean and Kimsey 1998: 70.

Lycogaster rufiventris : Schulz 1908: 28, fig. 2; Bischoff 1938: 10; Weinstein and Austin 1991: 428; Chen et al. 2014: 45.

Diagnosis.

Female: Length, 8.0-10.0 mm. Antenna black. Head black with clypeus except for black narrow anterior margin and mandible except black apex white. Mesosoma black with anterior margin of pronotum, spot on posterior lateral corners (near tegula) of pronotum, tegula, small oval spot on posterior-central prescutum, oval spot on anterocentral area of mesoscutellum, and metascutellum white. Legs black with most of trochanters except ventrally, extreme tip at base and apex of femora, outer surface of fore tibia, foretarsus, and extreme bases of mid- and hind tibiae white. Metasoma orange with tergite 5 or 6 to apex, and sterna 3 to apex black; apical broad margin of sternite 2 white. Wings lightly infuscated, a little darker toward apex; veins and stigma black. Head: Antenna with 24-25 antennomeres; flagellum somewhat incrassate at center. Shiny; vertex almost without punctures; frons more densely punctate; covered with fine white hairs. Mesosoma: Shiny, uniformly densely punctate; covered with fine white hairs. Metasoma: Shiny, uniformly densely punctate; covered with fine white hairs. Medio-apical process with small indentation at center on sternite 2 (Figs 4 , 6 ).

Male: Length 8.0-9.0 mm. Color similar to female. Antenna without tyloids. Paired protuberances at center near apex of 2nd sternite (Fig. 7 ).

Specimens examined.

THAILAND: Prachuab Khiri, Khan, Khao Sam Roi Yot NP, Sailine wetland/Pa Gwad/N, 12°9.2'N, 99°58.298'E, Malaise trap, 1-8.ii.2009, Yai; Amnad leg., T4191 (1 ♂, QSBG)); Prachaub Khiri, Khan, Khao Sam Yot NP, Saline wetland/Pa Gwad/N, 12.153°N, 99.972°E, MT, 18-26.i.2009, Yai; Amnad, H2648 (1 ♀, QSBG); Lampang, Chae Son NP, behind youth camp, 18.831°N, 99.458°E, 445 m, MT, 14-21.ii.2008, B. Kwannui & A. Sukpeng, H2572 (1 ♂, USNM); Loei, Phu Kradueng NP, Mixed deciduous/S Na Noy office, 16.817°N, 101.794°E, 276 m, MT, 7-14.v.2008, Thonghuay Phatai, H2611 (1 ♀, USNM); Sakon Nakhon, Phu Phan NP, stream entrance of Nam Pung substation, 16°54.63'N, 103°54.266'E, 281 m, Malaise trap, 6-12.v.2007, Sailom Tongboonchai leg., T2611 (1 ♀, QSBG); Nakhon Si Thammarat, Namtok Yong NP, Behind campground lavatory, 8°10.434'N, 99°44.508'E, 80 m, Malaise trap, 23-29.vii.2008, U.prai.K. leg, T3082 (1 ♀, PT).

Distribution.

Myanmar; Thailand.

Comments.

The contrasting red metasoma is not known in any other species of Lycogaster . Magretti (1897) described this species from Myanmar. The species was assigned to Lycogster by Schultz (1908), Bischoff (1938), and Weinstein and Austin (1991). Carmean and Kimsey (1998) could not locate the holotype and placed it in Trigonalys based on similarly colored specimens from central and southern India. We have examined those specimens from India, borrowed from the MCZ and OSAC, and confirm that they are a species Trigonalys . However, as explained by Schultz (1908), who redescribed the species from the holotype and corrected the sex to a female, and Chen et al. (2014), Magretti’s species is clearly a Lycogaster . Our specimens from Thailand agree with Magretti’s description of Lycogaster rufiventris , and confirm placement in Lycogaster . The discovery of the male further confirms placement in Lycogaster . The absence of tyloids on the antenna and presence of a pair of protuberances centrally near the apex of sternite 2 (Fig. 7 ) is typical for the genus. This is the first collection of both sexes of this species since the original description.

Figures

Figures 4 - 7. Lycogaster rufiventris. 4 Lateral, female 5 Head, front, female 6 Apex of second sternite of female, ventral 7 Apex of second sternite of male showing paired protuberances.