TILLYARD. ' 169 



?, (unique), differs from <? only in its slightly larger size (expanse 13.5 mm.) 

 and in the following characters: — Head smaller, with much smaller blackish 

 eyes, dichoptie but divided transversely; mandibles present. Abdomen much 

 stouter than in cT, tapering apically, blackish with plentiful grey pubescence, and 

 ending in a pair of small, bluntly cornute appendages. The wings, damaged by 

 immersion in water, appear to be somewhat more deeplv infuscated than in 

 the <J. 



Types : — d" holotype, ? allotype and short series of male paratypes in 

 Cawthron Institute Collection, Nelson, N.Z. A single paratype male in British 

 Museum of Natural History, London, and another in the Australian Museum, 

 Sydney. 



Habitat: — Only found on the large waterfall on Digger's Creek, Mount 

 Kosciusko, 4500 feet, about two miles below the hotel, and on the rapids round 

 about it. November 28th, 1921 ; ten males taken by myself, and a single female 

 found half-drowned by Mr. A. J. Nicholson. Larvae and pupae were plentiful 

 on the rocks over which the water was running or the spray dashing heavily. 

 The males were caught drifting up stream in sunlight along the rapids above the 

 falls; they are very difficult to see. When alive in the pill-box, their large green 

 eyes glow brilliantly, like those of Tabanids and certain dragonflies. One male 

 was beaten from a bush overhanging the rapids. There is no iridescence on the 

 wings. 



This species is dedicated to Mr. A. J. Nicholson, B.Sc, F.E.S., Lecturer in 

 Entomology in the University of Sydney, who accompanied me to Mount Kos- 

 ciusko and himself took the only known female of this insect. 



Genus A P I S T M Y I A Bigot. 



(Text-tig. 1, c.) 



Bigot, Awn. Soc. ent. France, (4). ii., 1862, pp. 109-114, pi. 1. 



Characters as given in the Key on p. 162, with the following additions: — an- 

 tennae only ten-segmented; eyes holoptic in the male, dichoptie in the female; 

 labium very long and narrow, with the distal segments of the labellum strongly 

 divergent; fore and middle leg's rather short, hind leg's long; spurs 0, 0, 2; anal 

 angle of the wing prominent. 



Genotype: — Apistomyia elegans Bigot (Corsica and Cyprus). 



APISTOMTIA TONKOIRI n.sp. 

 (Plates xliv., fig. 4; xlv., fig. 1-7, c; Text-fig's. 2, e, /'; 6; «-c; 7). 



d\ Total length 5.5, abdomen 4, fonewing 5.5, expanse 12 mm. 



Head (Text-fig. 2, e.) large, black, globular, almost entirely occupied by the 

 large eyes, which are bright green in life, dull blackish when dead, and some- 

 times collapsed in the dried specimen; these eyes are holoptic, and each is divided 

 transversely by a non-facetted line into two approximately equal portions, the 

 upper having larger facets than the lower. Ocellar tubercle very small. An- 

 tennae (Plate xlv., fig. 1, c.) inserted fairly close together at the base of the 

 narrow triangular vertex; short (0.7 mm.), black, 10-segmented, the two basal 

 segments enlarged, the second longer than the first, the third much slenderer and 

 only two-thirds as long as the second, 4-9 short, nearly equal, each about as wide 

 as long, 10 nearly as long as 2, more than twice as long as 9, elongate oval with 

 well rounded apex, 2-10 with very fine hairs. Face with silver-grey pubescence 

 and hairs. Labrum-epipharynx about half as long as the basal segment of the 

 labium, moderately broad, tip sharply pointed. Hypopharynx a little shorter, 

 much slenderer, more sharply pointed. Mandibles absent. Maxillae (Plate xlv., 



