86 Transactions. — Zoology. 



cell and reach the costa. Submarginal and first and second 

 posterior cells with ocellated spots. Anal and auxiliary cells 

 with simple spots. Cross-veins broadly margined ; the second 

 posterior cell with a sinuated, transverse, pale line. Length, 

 9 mm. ; wing, 8 mm. 



Hab. Auckland (Captain Broun) ; Wellington (Hudson). 



Genus Tkigonometopus, Macquart (1835). 

 Head projecting in front, the face strongly receding. 

 Third joint of the antennae rounded, or a little elongated. 

 Cheeks with a row of well-developed bristles situated on a 

 ridge descending from the front near the eye and extending 

 back to the occiput. 



Trigonometopus bipunctatus, sp. nov. 



Front dark reddish-brown, with a narrow pale central 

 line; the face grey. Antennas dark - ferruginous. Thorax 

 brownish-grey, with four broad reddish-brown bands ; the 

 sides and under-surface grey. Abdomen brown, with grey re- 

 flections on the sides and posterior margins of the segments. 

 Legs tawny in the male, brown in the female. Wings 

 pellucid, the two cross-veins broadly margined with brown. 

 Length, 7 mm. ; wing, 8 mm. 



Hab. Chatham Islands (J. Fougere). 



The second joint of the antennas is rather long and 

 conical; the third joint is nearly circular; the arista is bare. 

 There is a small curved ridge on each cheek, running from 

 near the base of the antenna to about the level of the 

 opening of the mouth, which bears fine hairs ; the cheeks out- 

 side this ridge are slightly hairy. The costa of the wing is 

 setigerous from the end of the auxiliary vein nearly to the 

 tip ; none of the longitudinal veins have bristles. The chief 

 cross-vein lies just inside the end of the first longitudinal. 

 The distance between the two cross-veins is about two and a 

 half times the length of the posterior cross-vein, which is 

 situated about one-half of its own length from the margin of 

 the wing. The middle tibiae only are spurred. 



Familv SAPKOMYZIMJ. 

 " Neuration complete; auxiliary vein of the usual struc- 

 ture, frequently very much approximated to the first longi- 

 tudinal ; costa of the wing without bristles or marginal spine ; 

 longitudinal veins without peculiar hairs ; posterior basal cells 

 small. Front with a single row of bristles on each side; no 

 vibrissas on the border of the mouth ; clypeus rather rudi- 

 mentary. Only the middle tibiae have terminal spurs; all the 

 tibias with a small erect bristle on the exterior side, before the 

 tip. Ovipositor of the female not horny " (Loew). 



