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326 Trans. Acad. Sci. of St. Louis. 



fifth. Provancher's A. tricolor, which is evidently A. 

 radiatus $ and six banded, is described as having only four 

 fasciae. 



Agapostemon viridulus F. 



Apis viridula Fabricius, Ent. Syst. II, 342, 9, 1793. 



Megilla viridula F&bTicina, Syst. Piez., 333. ?, 1804. 



JIalictus viridula Say, Bost. Journ. I, 394, ?, 1837, Lee. Edit. II, 772. 



Halictus dimidiatus Lepeletier, Hist. Ins. Hym. II, 283, $, 1841. 



Agapostemon nigricornis Smith, Brit. Mus. Cat. Hytn. I, 86, $ (non J^ ?), 

 1853. 



Augochlora radiata Provanclier, Nat. Can. XIII, 205, $, 1882. 



Augochlora radiata Provanclier, Faun. Ent. Can. Hym., 705, $, 1883. 



Agapostemon viridula Cresson, Synopsis, 309, 9, 1887. 



Agapostemon nigricornis Cresson, Synopsis, 309, $, 1887. 



Agapos,temon bicolor Eobertson, Trans. Am. Ent. Soc. XX, 148, $J^, 1893. 



Agapostemon viridula Robertson, Trans. Am. Ent. Soc. XXII, 118, 1895. 



Augochlora radiata Dalla Torre, Cat. Hym. X, 96, in part, 1896. 



Agapostemon virescens Dalla Torre, Cat. Hym. X, 98, ? in part, 1896. 



2. — Head and thorax golden green, the abdomen black. 



^. — Wings hyaline; trochanters black, with a more or less 

 greenish reflection; femora black at base behind ; front tibiae, 

 except a spot beneath and rarely a small one above, yellow ; 

 middle tibiae with a black or fuscous spot exteriorly and 

 within; hind femora hardly more thickened than the others; 

 hind tibiae straight, with a black spot at base, another on 

 middle, sometimes wanting, and a little brownish at tip ; 

 metathorax rather evenly reticulated but not coarsely so; 

 abdomen five-fasciate, last ventral segment with central long- 

 itudinal carina, third from last of equal length, not thickened 

 or emarginate, segments black with testaceous margins, 2-5 

 with basal angles more or less yellow, the ventral surface 

 usually two-spotted, often with four, more rarely with 6 or 8 

 spots. Length 10-12 mm. 



90 2, 60 ^ specimens; Can., Vt., N. H., Mass., Ct, N. Y., 

 Pa., Md., Va., N. C, Ga., La., Tex., Mich., 111., Neb., Ks., 

 Col., Utah, Idaho, Wash. 



In the Systema Piezatorum, 333, the Megilla viridula is 

 distinctly credited by Fabricius to North America, while his 

 Apis virescensy Syst. Ent., 378, is only credited to America. 

 It is an absurd affectation of ( authority to give this name to 

 the Cuban species, before iUis shown that Fabricius did not 



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