Marshall. — On New Zealand Diptera. 261 



with setiferous hair. Metathorax highly arched or perpen- 

 dicular. Scutellmn generally small, semicircular, sometimes 

 lai'ge, rounded, triangular, generally setiferous ; no transverse 

 suture. Abdomen six- or seven -segmented, rarely eight- 

 segmented, cylindrical or compressed at the sides, narrower 

 at the base. Male with a large or small anal joint hold- 

 ing forceps ; female with an ovipositor with two terminal 

 lamellae ; the hair, except in a few cases, short and lying 

 close. Legs sometimes long and slender, sometimes short and 

 robust. Coxae very strong and elongated. Femora broadly 

 flattened, usually strong. Tibise spurred, and with lateral 

 spines, rarely without the latter ; fore ones with a spur and a 

 very short spine, two hind ones with two spurs and one to 

 four ranges of lateral spines on the outside, and generally 

 with one range on the inner side ; rarely all the tibiae un- 

 armed. Tarsi long and slender, or short and strong; meta- 

 tarsus frequently prickly. Wings ovate, longer or shorter 

 than the abdomen, with a broad, rounded, more or less cunei- 

 form base. Five or six longitudinal veins, the fifth generally, 

 the sixth always, rudimentary ; three cross-veins, of which 

 the humeral and subniarginal are always present. Third and 

 fourth longitudinal veins almost always, and the second longi- 

 tudinal sometimes, forked. No discoidal cell. The first and 

 fourth longitudinal veins are always complete, and form the 

 most important veins issuing from the root of the wing. The 

 <;ostal vein either extends quite to the apex of the wing or 

 stops rather short. The auxiliary vein is often incomplete. 

 Second longitudinal vein issues from the fourth longitudinal 

 vein near its middle or close to its base — in the former case 

 it is broken in an angle, in the latter case it arises obliquely ; 

 it joins the costa at or before the apex of the wing. The 

 anterior branch of the fourth longitudinal vein issues rarely 

 near the root of the second longitudinal vein. When the 

 second longitudinal vein issues from the middle of the fourth 

 longitudinal vein it is at the base coalescent with the anterior 

 branch of the fourth longitudinal vein, and the third longi- 

 tudinal vein has its origin a little below or above the marginal 

 cross-vein, and its fork lies higher up in the wing-disc. In 

 this arrangement the second longitudinal vein is rarely simple, 

 but usually sends out an anterior branch, which runs into 

 the costa or into the first longitudinal vein ; this branch 

 may be short or long. When the second longitudinal vein 

 issues from the base of the first longitudinal vein the third 

 longitudinal vein issues from the angle before the marginal 

 cross-vein. Earely the anterior branch of the fourth longi- 

 tudinal vein is missing, still more rarely the anterior branch 

 of the thiri longitudinal vein ; infrequently one of these 

 branches is or both are detached at the base. Fifth longi- 



