518 Mr. T. D. A. Cockerell — Descriptions and 



dull, densely but shallowly punctured ; mesotliorax very 

 densely and sliallowly punctured, but glistening ; scutellum 

 shiuing, fiuely punctured; area of metatliorax appearing 

 rough under a lens, but with fine ridges, connected by 

 transverse ones, the apical part with an exceedingly minute 

 cancellation, the cells transversely elongate ; ajncal trun- 

 cation without sharp lateral margins ; tegula? rufo-testaceous. 

 Wings perfectly clear ; stigma light reddish, with darker 

 margin ; nervures sepia ; outer r. n. and t.-e. rather slender, 

 but dark ; second s.m. narrow ; first r. n. meeting second 

 t.-c. Abdomen Avith a veiy thin pruinose pubescence, and 

 indistinct patches of toraentum at lateral bases of segments ; 

 apical plate dark brown, very broad, and rounded. The 

 second abdominal segment is very densely punctured in the 

 subbasal region. 



Hub. Brisbane, Queensland, Oct. 3, 1912 {Hacker ; 

 Queensl. Mus. 72). 



Ueadily known from //. hJackburni by the rough meso- 

 tliorax, the dense punctures visible under a lens. Compared 

 with H. forresti, the clypeus is less produced, and the meso- 

 tliorax is very much more densely punctured. 



Halictus mediojJolUus, sp. n. 



$ . — Length about G^ mm. 



Black, with very pale ochrcous-tinted or creamy hair; 

 mandibles dark ; head broad, clypeus and supraclypeal area 

 shining, with spaise small punctures ; sides of face and 

 front glistening, middle of front dull, striate, with small 

 punctures at intervals between the striae ; flagcllum dark, 

 the last two joints lively red beneath; mesotliorax and 

 scutellum bare, highly polished, and shining ; mesotliorax 

 with sparse very minute punctures and very widely scattered 

 large ones ; scutellum with extremely minute sparse punc- 

 tures, principally about the median dciircsKlon ; area of 

 metatliorax very large, semilunar, appearing giaiiular under 

 a lens, but actually minutely reticulate, the niai-gin finely 

 punctate ; posterior truncation small, sharjily defined at 

 sides below. Logs black, the apical tarsal joints ferruginous ; 

 liind spur with a single large blunt subbasal lamina; teguhe 

 clear rufo-tcstaceous. "Wings clear, stigma and nervures 

 dusky rufous, the stigma very long; outer r. n. and t.-c. 

 evanescent ; second s.m. very broad, receiving first r. n. near 

 apex. Abdomen shining, minutely and (juite closely punc- 

 tured ; segments 2 to 1 with dense basal bands of creamy- 



