228 Transactions. 
ocality.— Stream above high waterfall at Wahi, near Tokaanu, southern 
end of Lake Taupo, 26th November, 1919 (Re dic Ty). 
his fine species is easily igs age from A. perscitus by its 
slenderer build, its narrower wings with much less dense venation, and 
closely in shape and venation, but can be at once distinguished from it by 
the colour-pattern of the wings both in the imago and subimago, by the 
presence of the two groups of thickened cross-veins on the forewing 
the legs, and finally by the very differently shaped ventral valve. It should 
c 
Fic, 2.— Details of the орош of the female ae in the three New Zealand 
species i e letus , A. perscitus Eaton, humeral angle of hindwing ; 
the same in A. стане ftot; e, the s same in A. flavitinctus n. sp. ; 
d, A. pesci Eaton, ventral valve; e, the same in A. ornatus Eaton; 
f. the same in A. flavitinctus n. sp. ; E wf foetus n. sp., hind tarsus ; 
h, A. Uri Eaton, hind tarsus. All ы 
be noted, however, that some female imagines of A. ornatus show slight 
yellow colouring along the costal margin of the forewing, this tint being 
distinctly more greenish-} T than lemon-yellow, and giving the insect 
a very peculiar appearanc 
It seems advisable [es to point out that A. perscitus Eaton Lad 
very greatly from both A. ornatus Eaton and A. flavitinctus n. sp. in the 
shape of its wings, the density and regularity of their cross-venation, AES 
in the remarkable structure of its large-headed larva. These characters, 
taken together, suggest that it is not really congeneric with them. Further 
than this, a study of the three New Zealand species shows that they differ 
considerably from the genotype, A. subnotatus Eaton, from North America, 
and it Арран probable that they may have to be placed in two new 
genera 
Family EPHEMERIDAE. 
Genus Існтнүвотоѕ Eaton. 
Ichthybotus bicolor n. sp. (Plate 19, and text-figs. 3-5.) 
d. Imago: Totallength, 19 mm. ; forewing, 16 mm. ; hindwing, 6 mm. ; 
expanse, 33 mm 
Head. deep chocolate-brown ; ; eyes blackish. ~ 
; Thorax deep chocolate-brown ; legs the same colour, except coxae and 
pose of the femora, which are paler. hue 105 5 mm. long. l 
