60 HYMENOPTERA. 



piccous. marjrins of the scp;mcnts palest, towards the apex co- 



vcrcil with a short silvery jnibesceuce. 



Hab. Van Diemen's Land. (Coll. J. S. Baly, Esq.) 



77- Halictus reprjESentans, n. s. B.M, 



Female. Length 4 lines. — Black, head closely punctured, 

 the antonuic nigro-pieeous towards their aj)cx. Tiiorax, the disk 

 closely and moderately punctin-ed ; at the base of the metathorax 

 a somewhat concave space, enclosed by an arched elevation, sub- 

 sinuated at the sides, the space covered by smooth radiating 

 grooves; wings subhyaline, the nervures and stigma ferruginous; 

 the legs covered above with a pale pubescence, which has in cer- 

 tain lights a silvery brightness; the tarsi beneath fulvous, the 

 apical joints ferruginous. Abdomen ovate, shining, very closely 

 and finely punctured ; on the basal margins of the second, third 

 and fourth segments a snow-white band, the two lirst interrupted 

 and forming lateral angular patches of downy pubescence, the 

 anal rima ferruginous. 



Male. — Has a general resemblance to the female ; neuration of 

 the wings the same, the whole insect thinly sprinkled with griseous 

 pubescence, dense and white on the face and shoulders ; apex of 

 the clypeus m hite ; the base of the metathorax is finel)' longitu- 

 (Unally rugose ; abdomen somewhat globose in appearance from 

 being incurved, the pubescence thicker on the basal margins of 

 the segments, but not forming patches or decided fasciae. 

 Hab. New Holland ; Van Diemen's Land. 



Obs. This species very closely resembles the H. leucozonius of 

 Kirby, but chtFers in the sculpture of the metathorax, and also in 

 having the second submarginal cell broader. From an examina- 

 tion of a large number of this apparently abundant species, it is 

 found to var)' in the grooving of the enclosed space at the base 

 of the metathorax, the grooving not being always smooth or 

 equally deeply sculptured ; the abdominal fasciaj are frequently 

 nearly obsolete, in others broader, sometimes narrower ; thus in 

 its varieties resembling those of the H. leucozonius. The male 

 is united, from the fact of their having been received together 

 from both localities on numerous occasions. 



78. Halictus PROPiNauu.s, n. s. B.M. 



Male. Length 3-3^ lines. — Bronze-green, closely and finely 

 punctured, extreme apex of the clypeus yellow, antennae fulvous 

 beneath ; the face has a hoary pubescence, the clypeus produced, 

 shining and sti-ongly punctured. Thorax clothed in fi'ont as 



