664: Mr. T. D. A. Cockerell — Descriptions and 



Bands at bases of second and third seg- 

 ments entire, and usually white 9. 



7. Mesothorax densely punctured all over . . mcmitotieUus, Ckll. 

 Mesothorax sparsely punctured, at least on 



disc 8. 



8. Anterior part of mesothorax closely punc- 



tured. (Washington State.) pacificus, Cldl. 



Anterior part of mesothorax sparsely punc- 

 tured. (Formosa.) l(evidermis, Ckll, 



9. First abdominal segment with a broad 



median band of white hair, thin or inter- 

 rupted in middle. (New Mexico.) .... sisymhrii, Ckll. 

 First abdominal segment without such a 

 band 10. 



10. Mesothorax very shiny, with sparse strong 



punctures 11, 



Mesothorax more densely or very densely 

 punctured , 12. 



11. Larger; first abdominal segment more 



strongly and clearly punctured, (Tan- 

 gier.) platycestus, Dours, 



Smaller ; first abdominal segment with 

 gcattered smaller punctures. (Europe) . . morbillosus, Kriechb. 



12. Area of metathorax irregularly wrinkled. 



(Formosa.) rccognthis, Ckll. 



Area of metathorax distinctly ridged .... 13, 



13. Area of metathorax with very oblique 



ridges ; mesothorax very finely and 



densely punctured, (Formosa,) multistictus, Ckll. 



Area of metathorax with straight ridges ; 

 mesothorax with punctures larger and 

 not so dense. (Europe.) leucozonius (Schr.). 



Halictus lavidermis, sp. n. 



$ . — Length about 9| mm., anterior wing 8. 

 Black, with pale ochraceous pubescence; head broad ; 

 antennae black ; mandibles bidentate, black, very obscurely- 

 reddish subapically ; clypeus very shiny, with strong punc- 

 tures ; front dull and granular (microscopically confluently 

 punctured) ; mesothorax very shiny, with scattered but 

 distinct punctures, in front gibbous; prothorax broadly 

 angulate on each side in front ; disc of scutellum shining, 

 with very few punctures ; area of metathorax not distinctly 

 defined, covered with strong irregular rugse; apical trun- 

 cation subreticulately sculptured, sharply defined all round ; 

 pleura hairy, with a very coarse partly striate sculpture. 

 Legs black, with reddish hair ; hair on inner side of hind 

 tibiae and tarsi shining yellowish ; hind spur with numerous 

 minute teeth, not readily noticeable without the microscope ; 

 tegulae shining piceous, the margin pallid in front. Wings 

 dusky; stigma and nervures rufo-f useous ; second s.ra. very 



