Macrophya maculitibia group

Li, Zejian, Liu, Mengmeng & Wei, Meicai, 2019, Three new species of the Macrophyamaculitibia group (Hymenoptera, Tenthredinidae) with a key to known species from China, Zoosystematics and Evolution 95 (1), pp. 37-48 : 37-38

Macrophya maculitibia group

Remarks.

Body black without metallic luster; posterior margin of metepimeron with a distinct appendage, appendage strongly elongated and polished, without long hairs; antennae and all trochanters black entirely; lancet narrow and long, with 20-21 serrulae, serrulae somewhat oblique, almost linear, middle serrulae each with 2 proximal and 12 or so distal teeth, subbasal teeth somewhat small and clear. This species group is a small lineage of Macrphya and is very close to the Macrophya imitator group but can be distinguished from the latter by having the posterior margin of metepimeron straight or slightly concave and the metepimeral appendage differentiated, but not elongated, at least partly punctured and evenly pilose, and without basin.

Description.

Body slender; black, always with a few white maculae on mandibles and subbasal part on dorsal side of hind tibia; sometimes with a few white maculae on anterior of fore femur and anterior largely of fore tibia; stigma and veins black; usually apical 1/3 of below stigma with smoky macula; clypeus slightly broader than the shortest distance between lower inner orbits; lateral margins convergent forwards, anterior margin shallowly incised to approximately 1/5-1/4 length of clypeus, apex of lateral lobe obtuse; malar space narrower than diameter of an ocellus; postocellar area broader than long; antenna slender, antennomere III clearly longer than antennomere IV, as long as antennomeres IV–V together; mesoscutellum rounded and elevated; mesoscutellar appendage with a high and acute middle carina; posttergite with a low and short middle carina; dorsal margin of mesepimeron with a distinct platform, as broad as diameter of an ocellus; posterior margin of metepimeron with a distinct appendage, appendage strongly elongated and polished, without long hairs and basin; anal cell of fore wing shortly constricted at approximately basal 1/4, with a long spot-like vein; anal cell of hind wing petiolate; inner spur of hind leg slightly longer than 1/2 length of metabasitarsus, metabasitarsus always slender, slightly longer than following four tarsomeres together; claw with inner tooth slightly shorter than outer tooth; dorsal side of head densely punctured; mesoscutellum densely or somewhat densely punctured; abdominal terga without reticulate microsculpture; penis valve longer than broad, harp narrow towards apex, ergot short.

So far, the M. imitator group is the second largest group in Macrophya , with 17 species, which are all present in China: M. bui Wei & Li, 2012, M. changbaina Li, Liu & Heng, 2015, M. circulotibialis Li, Liu & Heng, 2015, M. curvatisaeta Wei & Li, 2010, M. curvatitheca Li, Liu & Heng, 2015, M. flactoserrula Chen & Wei, 2002, M. funiushana Wei, 1998, M. imitatoides Wei, 2007, M. imitator Takeuchi, 1937, M. jiaozhaoae Wei & Zhao, 2010, M. kangdingensis Wei & Li, 2012, M. nigromaculata Wei & Li, 2010, M. omeialpina Li, Jiang & Wei, 2018, M. parimitator Wei, 1998, M. postscutellaris Malaise, 1945, M. semipunctata Li, Liu & Wei, 2018, and M. weni Wei, 1998 ( Li et al. 2018d). Among them, M. imitator Takeuchi is also distributed in Japan, Korea, and East Siberia ( Takeuchi 1937), and M. postscutellaris Malaise is also distributed in Myanmar ( Malaise 1945). This two species groups are easily to be distinguished by the key to species groups worldwide by Li et al. ( Li et al. 2018d).

The M. maculitibia species group includes two known species and three new species described here. They can be separated by the following key.

Key to the Chinese species of the Macrophya maculitibia group