218 Mr. W. H. Ashmead's 



On account of the variability of venation, some of the 

 species falling in this genus could easily be confused with 

 some of the species in the genus Halietus. In order to 

 prevent confusion, my recently published generic table 

 of the Halictin<v, Tr. Am. Ent. Soc, xxvi, p. 02, line 10, 

 may be modified as follows : 



Ocelli normal, the lateral ocelli very distant from the eye mari^nn. 



Eyes without an emargination within ; tongue short. Halicttis, 

 Latr. 



Eyes with a more or less distinct emargination within ; tongue 

 long. AiKjocldom, Smith (= Oxystoglossa, Smith pars'). 



Genus Halictus, Latreille. 



The species of this genus, five in number, may be separ- 

 ated by the aid of the following table : 



TABLE OF SPECIES. 



1. Abdomen not testaceous 2 



Abdomen testaceous ; head and thorax metallic green, the face 



l>elow the antenna?, scutellum and pleura plumbeous ; knees 

 and tarsi testaceous H. gemm(dn», Smith. 



2. Golden-green, bronzed or brassy-green sjjecies 3 



Blue or plumbeous species. 



Head, thora.\; and abdomen entirely blue ; tegulte and ant'jnnw 

 black ; wings fuscous ; legs black with a whitish pubescence, 

 the tibia) and tarsi dark rufo-piceous ; metanotal area not 

 bounded by an elevated rim, but with strong radiating lines 

 within. H. cyancus, n. sp. 



Head on vertex and sometimes on the face, and the abdomen 

 with' a decided metallic green and seneous tinge, the thorax 

 plumbeous or bluish with a slight metallic tinge in certain 

 lights ; wings hyaline or only faintly tinged ; tegulas dark 

 rufous or rufo-piceous ; metanotal area not bounded by an 

 elevated rim, with the elevated lines within less distinct and 

 more numerous and iri'egular H. phimheas^ n. sp. 



3. Head and thorax bronzed green, sometimes with a brassy tinge, 



the clypeus towards apex purplish and almost impunctate ; 

 head closely punctate ; thorax feebly shagreened and somewhat 

 sparsely punctate ; metathorax above plumbeous ; abdomen 

 bronzed green and pubescent as in H. plumheiisy legs variable 

 from a black to a dark rufo-piceous and clothed with a whitish 

 pubescence, the tibite usually rufo-piceous, the knees tarsi and 

 mandibles testaceous, the inner spur of hind tibite with four 



