MAY-FLIES. 31 



The expansion of the wings of the male is about 1 inch, of the female 

 about 1| inches. 



Sub-imago (dried, and perhaps partly reddened }>ost mortem in the killing- 

 bottle). — Fore-wings, in the marginal and sub-marginal areas, tinted with 

 dull reddish-purple, but elsewhere marbled with blackish-grey ; the cross- 

 veinlets in the lighter spaces bordered more or less narrowly with this same 

 colouring. 



Imago <? (dried). — Notum and legs raw umber or light pitch-brown, 

 opaque at the extreme tips of the fore-femur and fore-tibia ; the fore-tarsus 

 matches the tibia in tint. Abdomen and forceps dark pitch or bistre- 

 brown ; the markings faded. Setse medium warm, sepia brown, with the 

 distinct joinings blackish ; some of the alternate joinings indistinct or 

 not coloured. Basal joint in the forceps limbs compressed, narrowed 

 somewhat suddenly after the acute end of the inferior dilatation. Penis 

 lobes contiguous to each other, concave beneath towards the line of contact, 

 up-curved, narrowed, and sloped off towards their truncate tips. Wings 

 vitreous with black neuration ; fore-wing, in the marginal and sub-marginal 

 ureas, tinted with transparent raw umber or brown amber; cross-veinlets 

 of the same areas, narrowly set off with black, showing strongly, and a 

 few of them (both near the sub-costal node, and again midway beyond 

 these towards the apex), suffused by a small dark-greyish cloud that 

 extends from the costa to just below the radius. The cross-veinlets of the 

 marginal area, all simple, number about six before and sixteen beyond the 

 bulla " (Eaton). 



Superficially this May-fly appears to be mainly distin- 

 guished from A. dentata by the marbled wings of the 

 sub-imago and by the less vivid red colour of costal region 

 of the fore- wings of the imago. In its general habits 

 and transformations it closely resembles that species. 



ATALOPHLEBIA DENTATA. 



Leptophlebia dentata, Eaton, Trans. Ent. Soc. 

 Lond., 1871, p. 80, pi. 4, fig. 18. Atalophlebia 

 dentata, Eaton, Trans. Linn. Soc, 2nd series, Zool., 

 vol. hi., p. 88 (1884). Trans. Ent. Soc. Lond., 1899, 



p. 287. 



(Plate VI., fig. 4 ? , 5 nymph magnified, 6 3 sub-imago.) 



This pretty May-fly is very common in the neigh- 

 bourhood of Wellington, and although it has not yet 

 been recorded from any other locality it is probably a 

 generally distributed species. 



The expansion of the wings in both sexes is about 1J inches. The 

 general colour of the body and legs is bright reddish- brown. The costal 

 margin of the fore-wings is bordered with bright red, stronger in the female. 

 There are three tails, each of which is nearly twice the length of the body, 

 the tails and anterior legs of the male being, as usual, considerably longer 

 than those of the female. 



• The larvae of this insect are extremely abundant under 

 stones in the streams, a dozen specimens or more, often 



