Marshall. — On New Zealand Diptera. 267 



longitudinal about the same length as its anterior branch ; 

 posterior branch ends ia the termination of the costa just 

 before the apex of the wing ; third longitudinal very slender, 

 apex of its fork slightly nearer the apex of the wing than 

 apex of fork of second longitudinal ; inner marginal cell 

 apparently open between second and fourth longitudinals; 

 both branches of fourth longitudinal strong, ending in the 

 margin; fifth longitudinal not complete, and very thin. For- 

 ceps of male dark at base, but yellow towards their apex. 

 Genital appendages of female dark-orange. 



HuTTONiA, gen. nov. 

 Head oval, almost round. Eyes emarginate, with a narrow 

 line of division betv/een them above the bases of the antennae. 

 Palpi moderately long, four-jointed ; first joint very short, almost 

 orbicular ; second rather long and swollen, length about twice 

 the bi'eadth ; third joint about as long as the second, narrow 

 and cylindrical ; third joint slender, rather longer than the 

 others. Front short. Ocelli three, nearly in a straight line, the 

 central one rather smaller than the others. Antennae about 

 as long as the thorax, 2 + 16 jointed ; joints of scapus cupuli- 

 form, about as long as broad, slightly setose ; flagellum rather 

 long, joints about twice as long as broad, pubescent, a few 

 setae situated near the middle point of each joint, terminal 

 joint very small and nipple - like. Thorax highly arched, 

 pubescent, with setae on the lateral margins. Scutellum small, 

 semicircular, with setae on the hind margin. Metathorax 

 acclivous. Abdomen slightly flattened, seven - segmented, 

 narrow in front but becoming broadened posteriorly Forceps 

 of the male large, almost fiabelliform, pubescent. Legs long 

 and slender ; coxae stout, setose on the outer edge and on the 

 apex ; femora about twice as long as the coxae, slightly com- 

 pressed, pubescent ; tibiae long and slender, longer than the 

 tarsi in the intermediate and posterior legs, and covered wath 

 two ranges of short and rather slender spines; spurs unequal, 

 long; tarsi with small prickles on the under-surface. Wings 

 rather narrow, cuneiform at the base and gracefully rounded 

 at the apex, surface pubescent. Auxiliary vein entirely ab- 

 sent ; first longitudinal short, running into the costa about 

 half-way along the wing ; inner marginal cell about one-tliird 

 the length of the wing; anterior branch of second longitudinal 

 running into the costa about two-thirds along the wing, pos- 

 terior branch strongly arcuated, joining the tip of tlie costa 

 at the apex ; anterior branch of third longitudinal a mere rudi- 

 ment extending a very little distance into the disc of the wing, 

 posterior branch commencing in the disc a little beyond the 

 fork of the second longitudinal ; fourth longitudinal not quite 

 joining the margin, disappears just before reaching the inner 



