HALICTUS. 35 



15. Halictus oblitus. 



Female. Length 3| lines. — Black, shining, and punctured. The 

 head very closely punctured ; the face with thin pale ochraccous 

 pubescence ; the clypeus very slightly produced, with strong punc- 

 tures, and truncate anteriorly ; the mandibles rufo-piceous at their 

 tips ; the flagellum of the antennae obscurely fulvous beneath. 

 Thorax closely punctured ; the postscutellum with fine pale to- 

 mentum ; the metathorax truncate, its base finely rugulose, the 

 margin of the truncation narrowly smooth and shining ; wings hj^a- 

 linc, the nervures black ; the apical joints of the tarsi rufo-testaceous. 

 Abdomen ovate, very finely punctured ; at the base of the second 

 and third segments, laterally, there is a little whitish tomentum. 



Hah. Swan River. 



16. Halictus convexus. 



Female. Length 3 lines. — Black, very finely and closely punctured ; 

 abdomen shining and delicately punctured, ovate, and very convex. 

 Head rotundate ; the clypeus truncate, slightly produced, shining, 

 and with a few strong punctures ; the flagellum obscurely fulvous 

 beneath. Thorax slightly shining ; wings hyaline and iridescent, 

 the nervures testaceous ; metathorax truncate, finely rugulose at 

 the base. Abdomen with a thin cinereous pubescence, shining at 

 the base ; at the basal margins of the second and third segments, 

 there is laterally, a little white tomentum ; on the basal margin of 

 the fourth segment a continuous band of tomentum. 



Hah. Victoria. 



17. Halictus urbanus. 



Female. Length 2^ lines. — Head and thorax green, abdomen 

 brownish black. Head dark olive-green, with a fine longitudinal 

 striation ; the mandibles ferruginous at their apex ; the flagellum 

 fulvous beneath. Thorax of a much brighter green than the head, 

 not shining, of a fine coriaceous texture ; the metathorax ruaose at 

 the base ; wings hyaline and splendidly iridescent, the nervures 

 rufo-testaceous ; legs rufo-piceous, their pubescence cinereous. 

 Abdomen shining and impunctate, the margins of the segments 

 rufo-piceous ; beneath, the segments have a long white pubescent 

 marginal fringe. 



Hah. Champion Bay. 



18. Halictus vividus. 



Female. Length 2 lines. — Green, with pale ferruginous tibiae and 

 tarsi, the posterior tibiae more or less fuscous beneath. Head very 

 finely and very closely punctured ; mandibles ferruginous : the fla- 



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