Thrinchostoma, de Saussure, 1890, de Saussure, 1890

Pauly, Alain & Eardley, Connal, 2013, A Revision of Afrotropical Thrinchostoma de Saussure, 1890 (Hymenoptera: Apoidea: Halictidae), Belgian Journal of Entomology 12, pp. 1-76 : 6

Key to the subgenera

(1) Very elongated head, especially very long malar area, equal to three quarters length of eye ( fig. 1a ) …............................................................................................... Subgenus Diagonozus

- Head and malar area shorter, not exceeding one quarter length of eye ( fig. 1b ) …..............(2)

(2) Male: submarginal cells of fore wings without tuft of setae ( fig. 2a ). Female: calcaria on hind tibiae with many small teeth of similar size ( fig. 2c ) .............. Subgenus Eothrincostoma

- Male: wings with a tuft of characteristic setae on crossvein between second and third submarginal cells ( fig. 2b ). Female: calcaria on hind tibiae with first tooth well-developed and laminated ( fig. 2d ) …......................................................................... Subgenus Thrinchostoma

Figures

Fig. 1

Fig. 2