Baeosega humida Krombein, 1983

Mita, Toshiharu, 2021, Taxonomic study of Baeosega and its allies, with description of a new species of Nipponosega (Hymenoptera, Chrysididae, Amiseginae), ZooKeys 1041, pp. 1-25 : 1

Baeosega humida Krombein, 1983 Figures 1A , 3 , 4

Baeosega humida Krombein, 1983: 46, holotype ♀ by original designation. Type locality: Central Province, Kandy District, Kandy, Udawattakele Sanctuary (Sri Lanka).

Baeosega laticeps Krombein, 1983: 48, holotype ♀ by original designation, new synonymy. Type locality: Central Province, Kandy District, Kandy, Udawattakele Sanctuary (Sri Lanka).

Specimens examined.

Holotypes. Baeosega humida : Sri Lanka ♀, " SRI LANKA: Kan. Dist. / Udawattakele Sanct./ Elevation 1800 ft. / 23-25-IX-1980 ", "Collected/ on or in/ leaf litter", " K.V. Krombein / P.B. Karunaratne / L. Jayawickrema / V. Gunawardane / P. Liyanage " " HOLOTYPE / BAEOSEGA/ HUMIDA/ Karl V. Krombein ", "Type No./ 100454/ U.S.N.M." (USNM); Baeosega laticeps : Sri Lanka ♀, " SRI LANKA: Kan. Dist. / Udawattakele Sanct./ 25-27-IV-1981 ", "collected on or/ in leaf litter", " K.V. Krombein / T. Wijesinhe / L. Jayawickrema ", " HOLOTYPE / BAEOSEGA/ LATICEPS/ Karl V. Krombein ", "Type No./ 100455/ U.S.N.M." (USNM) . Paratypes. B. humida : Sri Lanka 1♂ (allotype), same locality as holotype, but collected at 21-22.IX.1980 (USNM) ; 4♀, same as above but K.V. Krombein, L. Jayawickrema, V. Gunawardane, T. Wijesinhe leg. (USNM); 4♀ 1♂, same locality as above, but collected at 23-25.IX.1980, K.V. Krombein, P.B. Karunaratne, L. Jayawickrema, V. Gunawardane, P. Liyanage leg. (USNM) ; 1♀, same locality as above, but 12-14.X.1980, K.V. Krombein, P.B. Karunaratne, L. Jayawickrema, V. Gunawardane, T. Wijesinhe leg. (USNM) ; 8♀, same locality as above, but 25-27.IV.1981, K.V. Krombein, T. Wijesinhe, L. Weeratunge leg. (USNM) ; 1♂, same locality and collectors as above, but 22.V.1981 (USNM); B. laticeps : Sri Lanka 2♀, same as locality as holotype of B. laticeps , but 12-14.X.1980, K.V. Krombein, P.B. Karunaratne, L. Jayawickrema, V. Gunawardane leg. (USNM) .

Diagnosis.

The female of Baeosega humida Krombein can be distinguished from B. torrida Krombein, the other known species of Baeosega , by having the smooth metasoma. The male is similar to B. torrida , however, B. humida can be distinguished from B. torrida by the short F3 (2.7 × as long as wide). Punctures on mesepisternum are often separated with each other, but sometimes contiguous as in B. torrida . The body color of both female and male is brownish unlike B. torrida . Other diagnostic characters are as follows: (female) body length 2.3-2.7 mm; head (Figs 1A , 3A, B ) black, bearing faint bronzy tint, punctate with interspaces granulated, except the costate scapal basin; malar sulcus indicated by a faint groove; occipital carina absent, only posterior margin of vertex forming corner behind ocellar triangle; mesosoma (Fig. 3C, D ) dark brown to brown, part of pronotum, mesoscutum and metanotum darkened; surface punctate with interspaces granulated; (male) body length 2.3-2.7 mm; head (Fig. 4A ) dorsally dark brown with face testaceous, punctate by densely located punctures; occipital carina absent; mesosoma (Fig. 4C ) dark brown with mesoscutum blackish, punctate as head; postero-lateral corner of propodeum with distinctly producing angle.

Distribution.

Sri Lanka (Central Province, Kandy District).

Remarks.

According to Krombein (1983), the slender proportion of the head and mesosoma of Baeosega laticeps Krombein is the important diagnostic character separating it from B. humida Krombein. However, the body proportion can be variable to some extent. This variation is probably caused by the different shape of the host egg. Because there is no significant difference except for the proportion (slightly compressed laterally or not), B. laticeps is considered to be a junior subjective synonym of B. humida .

Figures

Figure 1. General habitus of Amiseginae A Baeosega humida Krombein, holotype ♀ B B. torrida Krombein, holotype ♀ C ditto, allotype ♂ D Nipponosega lineata sp. nov., holotype ♀. Scale bars: 1.0 mm.

Figure 3. Baeosega humida Krombein ♀ A holotype of B. humida, head in frontal view B ditto, dorsal view C ditto, mesosoma D holotype of B. laticeps, mesosoma. Scale bars: 0.5 mm.

Figure 4. Baeosega humida Krombein, allotype ♂ A head in dorsal view B forewing C mesosoma. Scale bars: 0.5 mm.