Dij)tera.] 



SUBANTARCTIC ISLANDS OF NEW ZEALAND. 



131 



Costal mtirgir 



Fig. 3 —Wing. 



Wings. — Greatly abbreviated, about J mm. in length and ^n mm- broad. No 

 veins present, but a slight thickening along the central axis of the 

 wing. No bristles present, except a few hairlike ones scattered 

 along the inner margin (see fig. 3). 



Legs. — Clothed with uniformly distributed and somewhat ad- 

 pressed black hairs. Tibiae slightly darkened at the tip and the 

 tarsi on the last joints. Each tibia has a pair of short but fairly stout pale spurs. 



Abdomen. — Clothed with fairly uniformly distributed pale hairs. Genitalia 

 clubbed, and apparently similar in general form to those of Zalusa. 



Female. — Similar to the male, except as follows : The hairs on the legs are 

 somewhat longer and not adpressed. Abdomen 

 piceous, and provided with a well-developed sabre- 

 like ovipositor about | mm. long. The breadth of 

 the latter, viewed from the side, is nearly constant 

 for about one-third of its length, and then sud- 

 denly diminishes, tapering thence to the end (see 

 fig. 4). It has a few scattered hairs on the basal half. 



Hab. — Auckland Islands. 



Type. — Cambridge Museum. 



Fig. 4. — Ovii'ositor. 



RHYPHIDAE. 



Rhyphus, Latreille. Hist. Nat. Crust, et Ins., xiv, 291 (1804). 



Rhyphus undulatus, sp. nov. 



Two specimens, sent by Mr. Hudson. 



Size. — Body, 7 mm. ; wing, 8 mm. 



This is a more robust and larger species than R. neozealandicus. The main points 

 of difference are as below : — 



Antennae black, with brown basal joints, instead of yellow with black tips. 



Thorax blackish, with 2 yellowish somewhat indistinct stripes extending from 

 the base of the wings to about the humeri ; also 2 very narrow dorsal stripes joined 

 in front to the first two stripes. 



Abdomen black, mottled with complex yellow markings. 



Wings. — The 2nd vein bent up sharply to the costa ; the 3rd more undulated 

 than in R. neozealandicus, thicker than in that species. The stigma is confined to 

 the distal half of the shorter radial cell, instead of filling it wholly. The wings are 

 very like these of the common British R. fenestralis. The difference between the 

 wings of R. neozealandicus and R. undidatus is shown below (figs. 5 and 6.) 



Fio. .5. — WiNO OF Rhyphiit undulatun. 



Fio. 6. — Wing ok Ithyiihiix neazealtindicm. 



