9. Scutellum with an obtuse median keel; posterior angles of scutellum rounded
Scutellum depressed in middle, without any keel; posterior angles of scutellum rather prominent Exærele smaragdina (Guérin).
Exærele dentata (Linné). 10. Scutellum with a patch of light fulvous tomentum; scape red.
Scutellum with a patch of black tomentum; scape dark, with a pale yellow mark
Scutellum without a patch of tomentum; scape pale yellow in front. Euglossa decorata ruficauda, new variety; female—K.
Euglossa singularis Mocsáry.—P.
Euglossa decorata ruficauda, new variety; male. 11. Very large bees, anterior wing at least 23 mm. long; integument partly or wholly ferruginous
Anterior wing less than 20 mm. long 12.
13. 12. Abdomen with broad black bands.
Abdomen without black bands Xylocopa frontalis nitens (Lepeletier); male[A]—P.
Xylocopa fimbriala (Fabricius). 13. Wasp-like bee, with fusiform abdomen, reddish wings and red legs; three complete submarginal cells,
    first recurrent nervure meeting second transversocubital
Otherwise formed, the abdomen broad at base Rhathymus beebei, new species
14. 14. Surface of eyes with fine short hair; first abdominal segment red, the others black; female abdomen sharply pointed.
Eyes not hairy; female abdomen not sharply pointed Cælioxys ardescens Cockerell. (Hym. 6 and 138.)
15. 15. Anterior wings with three complete submarginal cells
Anterior wings with submarginal cells incomplete or wanting; stingless social bees 16.
29. 16. Small bee, about 8 mm. long; wings beyond middle milky-white, the extreme apex dusky
Larger bees; the wings not thus colored Tetrapedia lacteipennis Vachal.—P.
17. 17. Abdomen clear ferruginous; large robust bees
Abdomen not ferruginous; or only partly so 18.
19. 18. Hind legs with black hair
Hind legs with pale hair Centris personata Smith; male.—P.
Centris personata Smith; female.—P. 19. Integument with at least some bluish, purplish or greenish tints; abdomen not banded; form very robust
Integument not at all metallic (very slightly in Eulæma nigrita, variety) 20.
21. 20. Larger; anterior wing at least 17 mm. long; head and thorax with black hair; fourth and fifth abdominal segments purple
Much smaller; cheeks densely covered with white hair; clypeus black in female, yellow in male Eulæma nigrita Lepeletier.
Xylocopa barbata (Fabricius). 21. Thorax and abdomen hairy; hair of thorax yellow, with a transverse black band, of abdomen black,
    with a