230 HYMENOPTERA. 



Mesothorax red or fulvous 1. 



Mesothorax green or blue 2 . 



1. Abdomen black, slightly stained with red. 



Parasphecod.es callomelittinus Ckll. 

 Abdomen fulvous, slightly stained with blackish. 



Halictus rowlandi Ckll. 



2. Abdomen marked with yellow... .Nomioides pcrditellus Ckll. 

 Abdomen not marked with yellow 3. 



3. Abdomen red or reddish, at least in part 4. 



Abdomen black 5. 



Abdomen green or blue or greenish or bluish 6. 



4. Abdomen entirely bright red Halictus eyrei Ckll. 



Abdomen dark or dusky H. tatei Ckll. 



5. Metathorax green H. urbanus Sm. 



Metathorax black H. lmmilis Sm. 



6. Tibiae red (males) 7. 



Tibia? dark, sometimes with some red 8. 



7. Flagellum long ; abdomen yellowish-green. ...H. daiupiei'i Ckll. 

 Flagellum short ; abdomen bluish H. WOOdsi Ckll. 



8. Mesothorax brilliant blue H. behri Ckll. 



Mesothorax green 9 . 



9. Area of metathorax feebly sculptured H. dauipieri Ckll. 9 . 



Area of metathorax strongly sculptured 10. 



10. Head broader H. flindersi Ckll. 



Head narrower H. WOOdsi Ckll. 9. 



Halictus ewarti sp. nov. 



9 . Length nearly 7 mm. ; head and thorax black, abdomen entirely 

 bright chestnut-red ; femora black, red at apex ; tibiae and tarsi entirely 

 clear red, with yellowish hair ; wings slightly dusky, stigma and ner- 

 vures dilute sepia. Head about as broad as long ; mandibles biden- 

 tate, ferruginous ; clypeus and supraclypeal area very shiny, with 

 scattered punctures ; front and upper part of head generally with ex- 

 tremely dense large punctures ; posterior orbital margins with a series 

 of little ridges ; scape long ; flagellum thickened apically, ferruginous 

 beneath, the last few joints also above ; mesothorax very strongly and 

 densely punctured, but in middle the punctures are separated suffi- 

 ciently to show the shining surface ; area of metathorax large, squarely 

 cut off behind, shining, and with very strong, irregular, coarse ridges, 

 like a Sphecodes ; tubercles densely covered with pale ochreous hair; 

 pleura with exceedingly rough coarse sculpture ; tegulse shining rufo- 

 piceous ; first r. n. joining second s. m. (which is not especially nar- 

 row) before the end; second t. c. on one side with the upper three- 

 fourths wanting ; hind spur microscopically serrate ; abdomen smooth, 

 almost wholly without punctures, but the third and following seg- 

 ments evidently hairy. 



