268 The American Naturalist. [M ar C h, 



Pubescence of abdomen white, dense, concealing 



surface except of 1st and 2d segments, 4. pruinosus. 



Head greenish, thorax hardly metallic, shining, 



face very broad between mandibles, 5. eephalicixs. 



Head and thorax greenish, abdomen black or brown, 

 sometimes with a bronzen reflection ; 

 Two submarginal cells, 10. anomalus. 



Face rounded, clypeus not strongly produced ; 



Disc of metathorax without enclosure, 6. obscurus. 



Disc of metathorax bordered by a raised line ; 



Pale greenish, very sparsely punctured, 9. apopkensis. 



More bluish, not very sparsely punctured, X. 



Face long, clypeus strongly produced; 



Wings and nervures dusky, 7. ashtneadii. 



Wings and nervures whitish, 11. longiceps. 



I. Halictus reticulatus. 9 —Head and thorax bluish, the abdo- 

 men black, clothed with thin pale fulvous pubescence ; face broad, 

 rounded, clypeus not produced ; disc of mesothorax sparsely punc- 

 tured, on the sides coarsely reticulated ; metathorax with a sharp trun- 

 cation bordered by a salient rim; the disc with a rugose enclosure 

 which is triangular, more or less truncate at edge of declivity, the 

 enclosure bare, elsewhere the metathorax clothed with long, thin pubes- 

 cence ; wings fusco-hyaline, more dusky at tips, nervures and tegula 

 testaceous ; legs black, knees, anterior and middle tibiae more or less 

 posterior tibiae entirely and tarsi testaceous; abdomen shining, 

 impunctate base of second and third segments each with a patch of 

 appressed pale pubescence on the sides. Length 7 mm. 



Florida: three 9 specimens taken at Inverness, Citrus Co., Feb. 12 

 and 14, on flowers of Primus umbellata. 



This species is distinguished from the following by its less coarse 

 sculpturing, its more perfectly defined metathoracic enclosure, paler 

 legs, darker wings, etc. Both are distinguished from all other metallic 

 Halictu* known to me by their coarsely reticulated mesothorax. 



2. Halictus hartii. 9 — Black, the head greenish, the thorax 

 bluish, clothed with thin whitish pubescence ; face broad, clypeus some- 

 what produced, punctures dense above antenme, elsewhere sparse, 

 vertex shining; mesothorax with coarse sparse punctures forming 

 coarse reticulations on the sides ; metathorax with abrupt truncation 

 bordered by a sharp rim; the di-c verv ric-m- with enclosure imper- 



