38 Transactions. — Zoology. 



Section B. 



First and second abdominal segments with close short 

 hairs, the others shining, and with scattered hairs only. Hind 

 tibiae with a blunt tooth at the apex, on the inside. 



Helophilus trilineatus. 



Syrphus trilineatus, Fabricius, Syst. Ent., p. 766 (1775). 

 Helophilus trilineatus, Voy. "Erebus" and "Terror," 

 Insects, pi. 7, fig. 19; Hutton, Cat. Dipt. N.Z., p. 41; 

 Hudson, Man. N.Z. Ent., p. 58, pi. vii., fig. 1. 



Face golden. Thorax grey, with three strongly marked 

 black bands ; the sides .covered with golden hairs. Abdomen 

 black, with a large yellowish spot on each side of the second 

 segment, which occupies rather more than the anterior half of 

 the segment. Legs testaceous, the femora black, except the 

 tip of those of the fore and middle legs. 



Male.— The whole of the vertex black, the boundary be- 

 tween it and the yellow of the face being a well-defined 

 straight line. Hind tibiae black, with a broad median testa- 

 ceous band. 



Female. — Forehead often dark-grey ; the black of the 

 vertex confined to the ocellar triangle. Hind femora some- 

 times with a testaceous spot on both inner and outer sides ; 

 the hind tibiae testaceous. 



Length, $ 13 mm., J 17 mm.; wing, $ 10 mm., ? 13 mm. 



Hob. Throughout New Zealand. 



Helophilus vicinus, sp. nov. 



Like H. trilineatus, but the yellow spots on the second 

 abdominal segment reach to the posterior margin. 

 Length, <y 12 mm. ; wing, $ 11 mm. 

 Hab. Chatham Islands (Fougere). 

 I have not seen the female. 



Helophilus antipodus. 



H. antipodus, Schiner, Reise der " Novara," Dipt., p. 359 

 (1868). Mallota antipoda, Hutton, Cat. Dipt. N.Z., p. 40. 



In this species the colours are almost the same as in 

 H. trilineatus, but the abdominal spots are yellower, and 

 occur on both the second and third segments. The vertex of 

 the female is black, and resembles that of the male. In the 

 male the yellow spots are larger than in the female, occupy- 

 ing nearly the whole of the second segment. The hind tibiae 

 are differently coloured in the two sexes, as in H. triline- 

 atus. Length, $ 11 mm., ? 13-14 mm. ; wing, J 9 mm., 

 5 10-11 mm. 



