58 HYMENOPTERA. 



third and fourth segments a fascia of white downy pul)cscence, 

 interspersed witli loiijr ]):ile hairs, the apex of the ahdomen ful- 

 vons ; heneath, tlie sep;mcnts are smooth at their base and punc- 

 tured towards their apical margins, which are more or less testa- 

 ceous. 

 Hab. Hunter River, Australia. 



71. Halictus sphecodoides, n. s. B.M. 



Female. Length 2 lines. — Head black, with a green hue in 

 some specimens, the flagellum nigro-piceous beneath, mandibles 

 ferruginous at their ape.x. Thorax black, the disk green ; the 

 teguliu pale testaceous, nemires ferruginous, the stigma fuscous ; 

 wings subhyaline, beautifully iridescent ; the anterior tibiae, the 

 knees of the intermediate and posterior pairs, and the tarsi, fer- 

 ruginous ; the anterior tibisc frequently black or fuscous above. 

 Abdomen ferruginous, smooth and shining, the base black ; 

 sometimes the apex fuscous. 

 Hab. New Holland. / 



72. Halictus carbonarius, n. s. 



Female. Length 4 lines. — Jet-black, head rather finely ru- 

 gose, the clypeus having large deep punctures. Thorax shining, 

 strongly, but not very closely punctured ; the enclosed space at 

 the base of the metathorax has a short rugose striation, the me- 

 tathorax truncate, the truncation smooth and shining; wings 

 slightly fusco-hyaline ; legs clotlied with dark fuscous pubescence, 

 the floccus nearly white. Abdomen elongate-ovate, closely and 

 finely punctured, the apical margins of the segments smooth and 

 shining, the anal rima fuscous, margined with black pubescence. 



Hab. Sydney, New South Wales. (Coll. F. Smith.) 



73. Halictus orbatus, n. s. 



Female. Length 3 lines. — Black, head very minutely and 

 closely punctured, the clypeus coarsely punctured and ciliated 

 with fidvous hairs, thinly covered with pale pubescence. Thorax 

 thinly clothed with pale pubescence, the disk strongly punc- 

 tured, the enclosed space at the base of the metathorax covered 

 with radiating rugose sculpture ; the wings hyaline, their 

 extreme base, the nervures and tegulse pale testaceous ; the 

 tibia: and tarsi covered above with silvery white pubescence, 

 tarsi beneath pale fulvous, apical joints of the tarsi ferru- 

 ginous. Abdomen globose, shining at the base, finely and closely 

 punctured, the margins of the segments narrowly rufo-piceous, a 

 patch of white pubescence at the base of the second segment 



