374 PROCEEDINGS OF THE ACADEMY OF [May, 



the disc on either side impunctate; area of metathorax crescentic, 

 with fine plicse which in the middle run into a reticulation, giving 

 a subrugose effect under a lens; hind femora and trochanters with 

 long curled floccus; hind spur simple; tegulae dark rufous; wings 

 hyaline, stigma and nervures ferruginous; second s. m. very broad, 

 receiving first r. n. at apex; abdomen shining where not covered with 

 tomentum, extremely finely punctured; venter with long white 

 hair, not forming a curled scopa. 



Hab.— Yarrawin, N. S. W. (Froggatt, 233). Close to H. lanarius 

 Sm., but smaller and more shining. 



Halictus confusellus sp. n. 



.9. Length about 7 mm.; black, with dull white hair; lateral 

 bases of second and third abdominal segments with cuneiform 

 patches of dense white tomentum, the apical part of abdomen also 

 hairy, but not densely; legs black. Mandibles black, faintly reddish 

 subapically; clypeus and supraclypeal area shining, sparsely punc- 

 tured; front densely punctured; antennae black; mesothorax and 

 scutellum shining, but very distinctly and quite closely punctured 

 all over; area of metathorax crescentic, with fine radiating plicae; 

 hind spur peculiar, with a very broad rather short lamina, and a 

 low keel-like one beyond, the latter slightly inclined to be double; 

 tegulae rufopiceous; wings slightly dusky; nervures fuscous, stigma 

 dull ferruginous; outer r. n. and t. c. evanescent; first r. n. reaching 

 extreme apex of second s. m.; third s. m. much' broader above than 

 second; abdomen shining, very finely punctured. 



Hab. — Launceston, Tasmania (F. M. Littler). Known from 

 H. imitans Ckll. by the ferruginous stigma and shorter area of 

 metathorax. 



The following key will facilitate the separation of a number of 

 species of Halictus discussed above: 



Mesothorax green 1. 



Mesothorax black; abdomen black 4. 



1. Small species, with red (or mainly red) tibia? 2. 



Larger species, with dark tibiae 3. 



2. Green of thorax very bright urbanus Sm. 



Green of thorax obscure mundulus Ckll. 



3. Mesothorax shining, sparsely punctured demissus Ckll. 



Mesothorax dull, much more closely punctured subinclinans Ckll. 



4. Males 5. 



Females 10. 



5. Lower margin of clypeus not yellow macrops Ckll. 



Lower margin of clypeus yellow or cream-color 6. 



