xv, 3 Cockerell: The Black Halictine Bees 271 
12. Area of metathorax entirely dull, very coarsely reticulate. 
thoracicus sublustrans subsp. nov. 
Area of metathorax shining or closely sculptured 13. 
13. Large species, with dark tegulse and very coarsely punctured mesotho- 
rax; apical area of first abdominal segment closely punctured. 
baguionis Crawford. 
Mesothorax not thus coarsely punctured 14. 
14. Scutellum sparsely punctured 15. 
Scutellum closely or finely punctured, often dullish or dull 22. 
15. Scutellum dullish, with large, very sparse punctures; mesothorax dull, 
with large sparse punctures (Mount Banahao).... oligostictns sp. nov. 
Scutellum shining; mesothorax with fine or close punctures 16. 
16. Mesothorax highly polished, little punctured; tegulae amber 17. 
Mesothorax dull or distinctly punctured . 18 . 
17. Hind margins of abdominal segments testaceous; area of metathorax 
distinctly striate, except the shining apical part (Mount Maquiling). 
lionotulus sp. nov. 
Hind margins of abdominal segments not testaceous; area of meta- 
thorax not distinctly sculptured (Mount Banahao). 
scintillans sp. nov. 
18. Head very large; scape largely red; anterior knees red in male; female 
unknown (Mount Banahao) scintillans sp. nov. 
Head not large; scape dark; abdomen with distinct bands of tomentum 
at bases of at least some of the segments 19. 
19. Larger species; middle of hind basitarsi with ferruginous hair on 
inner side; mesothorax shining and with very distinct punctures. 
luzonicus Strand. 
Smaller species; basitarsi without strongly red or orange hair 20. 
20. Stigma pale testaceous; area of metathorax shining, with very dis- 
tinct longitudinal plicae; first abdominal segment with a tuft of 
white hair on each side philippinensis Ashmead. 
Stigma dark 21. 
21. Disk of mesothorax very sparsely punctured; posterior truncation of 
metathorax brilliantly shining (Baguio) postlucens sp. nov. 
Disk of mesothorax much more closely punctured; posterior truncation 
dull or dullish, except upper end itamimis sp. nov. 
22. Hind margins of at least some of the abdominal segments pale tes- 
taceous; tegulse rufotestaceous ; stigma dull reddish, not dark 23. 
Hind margins of abdominal segments not testaceous..... 25 . 
23. Testaceous band on second abdominal segment in middle occupying 
about half of segment; first segment with broad testaceous margin; 
hind tibia; and tarsi dull reddish (Mount Maquiling). 
fulvovittatus sp. nov. 
Testaceous band on second abdominal segment, if present, not occupy- 
ing a fourth of segment... 24. 
24. Larger; truncation of metathorax distinctly margined above (Davao). 
davaonis sp. nov. 
Smaller; truncation not bounded above nesiotus Crawford. 
Like the last, but more robust, with red knees and redder teguke. 
nesiotus domitus var. nov. 
