Dec, 1907.] Crawford : Notes on Halictus. 187 



5. Face and legs entirely dark 6 



Face and legs not entirely dark lo 



6. Tegiilas punctured all over ; base of metathorax with a triangular enclosure. 



nehitnbonis Robertson. 

 Tegulns not punctured all over ; metathorax not with a triangular enclosure 7 



7. Small species, about 5 mm 8 



Larger species, 7 mm. or more 9 



8. Punctures of mesothorax fine, sparse ; rugre of metathorax finer, enclosure indis- 



tinct .pectoraloides Cockerell . 



Punctures of mesothorax coarse, close ; rugaj of metathorax coarse, enclosure 

 semicircular, distinct .pectoraJis Smith. 



9. Wings clear, pubescence grayish j/jrjj'Wi^r/z Cockerell. 



Wings dusky ; bands on abdomen not complete olympicE Cockerell. 



10. Clypeus light anteriorly, legs dark II 



Legs more or less light 14 



11. Head large quadrate, mandibles long, apex of one reaching to base of other. 



coriaceus Smith. 

 Head and mandibles normal 12 



12. Base of metathorax coarsely rugose siviilis Smith 



Base of metathorax finely wrinkled* 13 



13. Wings dusky, metathorax at apex with a carina fuscipennis Smith. 



Wings yellowish, no carina at apex of metathorax irizonatus Cresson. 



14. Only the tarsi whitish 15 



Tibiae more or less light 17 



15. Head and thorax smooth, shiny, almost impunctate, pubescence long, abundant. 



titttsi Crawford. 

 Head and thorax closely punctured 16 



16. Smaller, antennae red beneath rujicornis Crawford. 



Larger, over 8 mm., antennae dark beneath .forbesii TLohi. 



17. Pubescence of head and thorax appressed, scale-like .galpinsife Cockerell. 



Pubescence of head and thorax not appressed 18 



18. Antennre short, hardly reaching the tegulte /c^x;? Robertson. 



Antenna long, reaching to metathorax at least 19 



19. Tubercles dark f 20 



Tubercles with a light spot. % 23 



20. Hardly 5 mm. long quadrimaciilatns Robertson. 



Over 6 mm. long 21 



21. Mesothorax dull from strong lineolation 7iiger W&r&<^ 



Mesothorax shiny, lineolation obscure 22 



22. Face narrow, metathorax finely rugose .ptillilabris Vachal 



Face broad, metathorax coarsely rugose arcuatus Robertson. 



* Here apparently run diatretus Vachal and synlhyridis Cockerell, which are 

 much smaller species. 



f Here run pacifiais Cockerel! ; granostis Vachal ; peraltiis Cockerell ; nigri- 

 colHs Vachal, all unknown to me. 



X Here run arctous Vachal ; gularis Vachal ; nigrideiis Vachal which I have 

 not seen. 



I 



