36 PSYCHE [April 



nervures, the testaceous apical margins of the abdominal segments, and the light 

 fulvovis apical fimbria. From H. truneatus Robt. the Maine species may be separated 

 by the 1st abdominal segment being punctured all over, and by the serrate hind spur. 

 H. arcuatus Robt. var. parisus n. var. 



According to Mr. J. C. Crawford the female diflfers from typical arcuatus in the 

 weaker striae of the metathorax and the less distinct punctures on the 1st abdominal 

 segment; the male in having the whitish mark on the ch^eus shorter and less distinct, 

 and the apical joints of the tarsi reddish, — in H. arcuatus they are all nearly white. 

 Compared with specimens of both sexes of H. arcuatus received from Mr. Crav\'ford, 

 the males of the ]Maine variety are larger, with the apical margins of the abdominal 

 segments black instead of pale testaceous, and the mandibles are also darker; the 

 females are ver}' similar to those of arcuatus, but the apical margins of the abdominal 

 segments are less testaceous, and the fasciae are thinner. 



The female was taken almost exclusively on Rhus t}'|Dhina, July 10; and the 

 male on Eupatorium perfoliatum, Aug. 25. Descriptions of H. arcuatus Robt. will 

 be found in Trans. Am. Ent. Soc. 20: 145, 1893, 9 ; Can. Ent. 34: 247, 1902, 9 d". 



Halictus pectoralis Sm. 



1853 Halictus pectoralis Sm. 9 , Cat. Hym. Brit. Mus. 1 : 68. 



1898 Halictus pectoralis Robt. c?, Trans. Ac. Sci. St. Louis, 8: 44. 



Female on Crataegus coccinea, June 14; garden blackberry, June 21; Solidago 

 juncea, Aug. 8; Leontodon autumnalis, Sept. 6; male on Solidago, Aug. 9-25; 

 Leontodon autumnalis, Sept. 6. Not common, the specimens are typical, this species 

 has a great north and south tlistribution. 



Halictus foxii Robt. 



1890 Halictus gracilis Robt. (not Mor.), 9 6", Trans. Am. Ent. Soc. 17: 310. 



1895 Halictus foxii Robt., Trans. Am. Ent. Soc. 22: 117. 



1896 Halictus gracillimus D. T., Cat. Hym. 10: 63. 



The Maine bees referred to this species may constitute a distinct variety, but it is 

 doubtful if the differentials prove reliable in a large series. The females differ from 

 typical H. foxii in their larger size, area of metathorax larger and with its margin 

 better defined, stigma darker, abdomen blacker and nearly smooth, wings more dusky, 

 tegulae darker. Female specimens taken on Salix Bebbiana, jMay 12; garden plum. 

 May 28; Crataegus coccinea, June 14; Rubus strigosus, June 16; Epilobium, angus- 

 tifolium, July 23; male on Aralia hispida, July 30, 1904. 



c7*. — Length 5 mm. Clypeus produced, apex yellow, labrum black; mandibles 



