Noteriadina Engel, Tran & Nguyen, 2022

Tran, Ngat Thi, Engel, Michael S., Truong, Lam Xuan & Nguyen, Lien Thi Phuong, 2022, First occurrence of the little-known genus Noteriades (Hymenoptera, Megachilidae) from Vietnam: discovery of a new species and a key to the Southeast Asian fauna, ZooKeys 1102, pp. 191-200 : 191

Noteriadina Engel, Tran & Nguyen subtrib. nov.

Type genus.

Noteriades Cockerell, 1931.

Diagnosis.

Small to modest-sized (4.5-10.2 mm), non-metallic, hoplitiform bees lacking integumental maculation; mandible of female quadridentate, without differentiated cutting edges, mandible of male bidentate; malar space linear; clypeus slightly projecting over clypeal-labral articulation; clypeus and often supraclypeal area with mediolongitudinal carina; paraocular area with dense appressed pubescence; preoccipital carina complete. Pronotum not enlarged nor surrounding mesoscutum anteriorly; pronotal lobe and omaulus carinate, with defined omaular surface; mesoscutellum flat, carinate posteriorly, overhanging metanotum (scarcely so in N. pulchripes ); propodeum wholly vertical, without basal subhorizontal zone; outer surfaces of pro- and mesotibiae apically with an acute angle and distinct notch anteriorly, therefore appearing bispinose in apical view; arolia present on all legs in both sexes (absent in Megachilina except Matangapis Baker & Engel and Heriadopsis Cockerell). Metasomal tergum I carinate dorsally at angle between anterior- and dorsal-facing surfaces; tergum VI of female nearly vertical except for apical flange-like hyaline margin, without preapical carina, tergum VI of male without preapical carina (present in Megachilina); terga V and VI of male strongly curved ventrally (only terga I-IV visible in dorsal view), covering tergum VII and sterna III-VI (no so in Megachilina); sternum I of male produced over its apical margin subapically, forming double carina (not so in Megachilina); volsella distinct, with well-developed digitus and cuspis, with heavily sclerotized denticles resembling those of short-tongued bee families and Pararhophites Friese. Refer to Gonzalez et al. (2019) for the supraspecific classification of Megachilini .