1908] LOVELL — HALICTIDAE OF SOUTHERN MAINE 33 



disc of the metathorax. Opportunity for more extensive comparison would doubt- 

 less reveal numerous differences in other species. 



Only the females of Halictus fly in spring, while the males are foimd in midsum- 

 mer and autumn. In the flower records given in this paper an endeavor has been 

 made to give the earliest and latest dates upon which each sex has been captured. 

 The females have been taken from April 30th to Sept. 6th ; during the early part of 

 the season they are common on the flowers of the willows, plums and blackberries 

 and later on Rosa humllis, Aralia hispida, Rhus tj^hina and other plants. The 

 males have been collected from July 19th to Sept. 12th (garden marigold), but chiefly 

 during the month of August. There is no better collecting ground for this sex than 

 the various species of golden-rod, and on a single inflorescence on Sept. Sth I collected 

 nearly a dozen specimens. The males, however, of H. arcuatus var. parisus have 

 been taken almost exclusively on the flowers of the thoroughvvort, or Eupatorium 

 perfoliatum, one only having been found on Solidago. Late in the season numerous 

 specimens of Halictus may be taken on the fall dandelion, or Leontodon autumnalis; 

 thus I find in my notes a record that twenty-four specimens, mostly of species of 

 Halictus, were collected on this plant on Sept. 6th. The females of H. lerouxii and 

 H. craterus are very common, and the males are nearly equally abundant, in which 

 respect they differ from the males of all other species of Halictus found in this locality. 

 All of the species appear to be polytropic except H. nelumbonis, which at Waldoboro 

 has been observed only on Nuphar advena. In some instances where only one or 

 two flower-records have been given this is due to the rarity of the species or to an 

 insufficient number of observations. The collecting season in this locality closes for 

 all genera except Apis and Bombus by the middle of September. 



Specimens of many of the species envmierated in this paper have been kindly 

 examined by Prof. T. D. A.. Cockerell who has compared them with authentic mate- 

 rial, and furnished valuable notes and suggestions. 



Halictus. 



(Halictus sens, str.) 



Halictus provancheri D. T. 



1882 Halictus constrictus Prov. (not Sm.), d", Nat. Can. 13:202. 

 1888 Halictus constrictus Prov. 9 cJ^, Add. faun. Can. Hym. p. 316. 



1895 Halictus fasciatus Robt. (not Nyl.), Trans. Am. Ent. Soc. 22: 117. 



1896 Halictus provancheri D. T. Cat. Hym. 10:77. 



