164 THE BEES OF THE SOLOMON ISLANDS, 



giving a subcancellate effect ; legs black ; hind spur with four 

 blunt teeth, the first two large ; tegulae piceous ; wings strongly 

 dusky; stigma dark reddish, nervures piceous; third t.c. and 

 second r.n. almost obsolete; third s.m. very short, higher than 

 long ; abdomen shining dark green, the hind margins of the 

 segments broadly blackened ; apical hair dark reddish ; large 

 large ventral pollen-collecting hair-fringes. 



Uab. — Solomon Islands, July- August, 1909(W. W. Frog- 

 gatt. No. C 13). Related closely to //. flimlersi Ckll., from 

 Queensland, but conspicuously differing in colour, and in the 

 sculpture of the metathorax. 



Halictus exterus n.sp. 



Q Length slightly over 6 mm. ; head and thorax shining, 

 dark green, with yellowish hair ; head and mesothorax olive 

 green, the other parts a bluer green; head broad, clypeus 

 rather prominent, smooth and sparsely punctured ; supra- 

 clypeal area smooth and shining ; front finely striate, the 

 striae in front of the middle ocellus transverse ; antennas dark, 

 the flagellum dusky reddish beneath ; cheeks in lateral view 

 as broad as eyes ; mesothorax and scutellum smooth and 

 shining, with scattered punctures ; mesothorax with a lightly 

 impressed microscopic linear sculpture, and some slight trans- 

 verse ridges anteriorly ; area of metathorax with very irregu- 

 lar ridges ; trochanters and femora black, tibiae and tarsi 

 rich ferruginous ; hind spur minutely pectinate ; tegulae shin- 

 ing rufopiceous ; wings hyaline, faintly dusky, stigma piceous, 

 nervures fuscous ; abdomen shining dark bluish-green, with- 

 out hair-bands or spots : hind margins of segments slightly 

 reddish ; no ventral polleniferous fringes. 



Hah.— Solomon Islands, July- August, 1909, 29's (W. W. 

 Froggatt, No. C. 14). Apparently related to H. ralunicola 

 Friese, from the Bismarck Archipelago, but that species has 

 red-yellow mandibles, and the red of the legs includes prac- 

 tically all of the femora. I do not know any very near rela- 

 tive in Australia. 



