Thrinchostoma 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 : 8-12

Key to the species in Thrinchostoma de Saussure, 1890

Males only:

(1) Antennae composed of only 12 segments ( fig. 5a ) ….................... T. emini Blüthgen, 1930

- Antennae composed of 13 segments ( fig. 5b ) ….................................................................. (2)

(2) Last segment of antennae bent at right angles or nearly so ( fig. 6a ) …............................ (3)

- Last segment of antennae straight ( fig. 6b ) …...................................................................... (6)

(3) Apical margin of S5 with setae ( fig. 7a ) ........................................................................... (4)

- Apical margin of S5 glabrous ( fig. 7b ) ................................................................................ (5)

(4) Hind femora strongly swollen ( fig. 8a ) ….............................. T. nachtigali Blüthgen, 1930

- Hind femora weakly swollen ( fig. 8b ) ........................................... T. sjoestedti ( Friese, 1909)

(5) Apical lobe of hind tibia short ( fig. 9a ); apical margin of S5 slightly curved ( fig. 9c ); terga always black ....................................................................................... T. kandti Blüthgen, 1930

- Apical lobe of hind tibiae longer ( fig. 9b ); apical margin of S5 distinctly concave ( fig. 9d ); terga often partly red, rarely totaly black ........................................... T. petersi Blüthgen, 1930

(6) Hind tibiae very broad and covered with a dense tomentum ( fig. 10a ); apical margin of S5 with long and very dense setae ( fig. 10b ) …............................. T. orchidarum Cockerell, 1908

- Hind tibiae of different shape and without dense tomentum; apical margin of S5 without setae or with less dense setae ................................................................................................. (7)

(7) Punctuation of scutum very sparse ( fig. 11a ) ................................................................. (8)

- Punctuation of scutum dense ( fig. 11b ) ............................................................................... (9)

(8) Metasoma and legs orange; hind femora swollen, apical lobe of hind tibiae acutely angled ( fig. 12a ) ............................................................................ T. amanicum (Strand, 1910)

- Metasoma and legs dark brown; hind femora slender, apical lobe of hind tibiae truncated distally ( fig. 12b ) ..................................................... T. uluguruensis Pauly & Eardley sp. nov.

(9) S5 without apical setae; apical lobe of hind tibiae triangular; posterior basitarsi narrow ( fig. 13a ); antennal segments long ............................................... T. productum (Smith, 1853)

- S5 with apical sertae; apical lobe of hind tibiae truncated distally; hind basitarsi very wide ( fig. 13b ); antennal segments short ................................ T. upembae Pauly & Eardley sp. nov.

Figures

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Fig. 13