Marshall. — On New Zealand Diptera. 275 



Avith seven segments in both sexes. Legs long ; tibiae spurred, 

 the spurs of unequal length ; lateral spines missing or exceed- 

 ingly small, one range on the inner side of the fore tibiae, one 

 on the inner side and two on the outer of the hind tibiae. 

 Wings microscopically pubescent, shorter than the abdomen, 

 base broad and rounded off, incumbent in repose. Costal 

 vein extending beyond the tip of the second longitudinal 

 vein, ending before the apex of the wing ; auxiliary vein 

 complete, terminating in the costa before the origin of the 

 third longitudinal vein ; subcostal cross-vein missing ; second 

 longitudinal vein forming a long-stalked fork with a short 

 anterior branch, the latter running into the costa, some- 

 times into the first longitudinal vein ; petiole of the third 

 submargiual cell always short ; fifth longitudinal vein com- 

 plete. 



I have specimens of three species of this genus, all of 

 which are of small size. 



Geroplatus dendiji, sp. nov. Plate IX., fig. 3. 



Length of antennae, 0-046 ; size of body, 0-198 x 0-038 ; 

 expanse of wing, 0-160 x 0066. 



Antennae dark ; scapus with lowest joint moderately long 

 and very thick, second joint about as long as broad, black, 

 with a faint tawny tinge ; joints of flagellum considerably 

 dilated and flattened, broadest at the base, and gradually 

 decreasing in width towards the apex ; surface pubescent, 

 with stiffer hairs on the margins, all joints of flagellum black. 

 Ocelli in a triangle, central, much smaller than the two lateral. 

 Crown dark-brown or black, pubescent. Thorax dark-brown, 

 with two lighter patches over the point of insertion of the 

 wings, and two broad indistinct lighter lines commencing 

 near the collare and coalescing some distance in front of the 

 scutellum. Thorax densely covered with black hairs. Scu- 

 tellum black, its posterior broader, fringed with black hairs. 

 Metathorax brown. Pleurae dark-brown. Halteres with 

 almost white pedicels; club brown for basal three-quarters, 

 apical quarter white. Abdomen black, with brown patches 

 on the middle segments. Forceps of male cinereous. Abdo- 

 men and forceps covered thinly with black hairs. Legs 

 moderate ; coxae straw-coloured, with black hairs, darker 

 at the tips ; femora, tibiae, and tarsi straw-coloured, but 

 covered with black hairs that become more numerous to- 

 wards the distal extremities ; one spur on each anterior 

 tibia, and two, the inner larger than the outer, on each pos- 

 terior tibia ; all black. Wings smoky, with a large dark 

 patch at the apex, and another smaller one proceeding 

 transversely from the costa to the petiole of the third 

 longitudinal. Auxiliary vein joining the costa just before 



