1908[ LOVELL—HALICTIDAE OF SOUTHERN MAINE 39 



however, a male taken on Epilobium angustifolium, July 23 (the same flower-record 

 as the female), and which from its close resemblance is undoubtedly the male of this 

 species. Length a little over 5 mm. Head and thorax very dark green appearing 

 almost black; face thinly clothed with white hair; mandibles black, red at apices; 

 flagellum brown-black, joint 4 = 2 + 3. IMetathorax with fine radiating raised lines 

 at base of area, not extending to the posterior margin, gibbous at apex; tegulae black, 

 stigma and nervures dark brown ; legs and abdomen black. 



Halictus nymphaearum Robt. 



1890 Halictus palustris Robt. (^not Mor.), 9 C?, Trans. Am. Ent. Soc. 17: 317. 



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



1896 Hahctus paludicola D. T., Cat. Hym. 10:75. 



One female on Iris versicolor the latter part of June; two males on Sagittaria 

 latifolia. Rare in this locality. 



Halictus hortensis Lovell. 



1905 Halictus hortensis Lovell, 9, Can. Ent. 37:39. 



Female taken on garden plum, May 28; Sedum acre, July 14; Leontodon autum- 

 nalis, Sept. 6; male on Sedum acre, July 18; Solidago, Aug. 22; and Leontodon 

 autumnalis, Aug. 17. A common species closely allied to H. sparsus, but sparsus is 

 darker colored and smaller (specimens received from Lehigh Gap, Pa., from jNIr. 

 Viereck, are less than 4 mm. in length), with the abdomen obovate, and the pubes- 

 cence upon the apical segments thinner or sometimes nearly absent. From Wash- 

 ington Co., Wis., through the kindness of Dr. S. Graenicher, I have received speci- 

 mens of both hortensis and sparsus; the much darker color of sparsus, and the very 

 thin, sparse pubescence on the apical segments easily separates it from hortensis. 

 The specimens of H. hortensis have the hair on the apical segments inclined to pale 

 buff-color, while in the Maine specimens it is usually white though occasionally vary- 

 ing slightly. Dr. Graenicher informs me, however, that on looking through his 

 material he found several specimens with white pubescence. 



d^. — Length 5 mm. Head longer than broad, face clothed with short, white 

 appressed pubescence; mandibles black, rufous at apices; antennae testaceous be- 

 neath; mesothorax finely punctured; disc of metathorax coarsely rugose, the rugae 

 extending to the apex; nervures and stigma dark bro\\Ti ; tegulae testaceous, or partly 

 dark; legs black, tibiae at base and apex, and tarsi testaceous; abdomen cylindrical, 

 finely punctured, apical margins testaceous. 



