HuTTON. — Oil New Zealand Neuroptera. 213 



longitudinal nervures are intersected by several delicate trans- 

 verse nervules. Antennae and caudal setae elongated. Legs 

 elongated. 



Distribution. — Tasmania and New Zealand. 



Leptoperla opposita. 



Perla ojjjjosita, Walker, Cat. Neuroptera Brit. Mus., p. 171 

 (1852). Leytoperla oiyposita, McLachlan, Trans. N.Z. 

 Inst., vol. vi., App., p. xcii. (1874), 



Black, shining, partly ferruginous. Head testaceous in 

 front, hardly broader than the thorax ; antennae very mi- 

 nutely pubescent. Prothorax minutely punctured, rugulose 

 on the disk, not broader in front, with a rim on each 

 side and along the fore border, sides straight, angles rather 

 sharp ; scutellum with a yellow spot in front. Wings very 

 slightly grey, darker about the transverse nervules ; nervures 

 black. Length of the bodv, 10 mm. ; expanse of the wings, 

 28 mm. 



Localities. — Tasmania and New Zealand. 

 Mr. McLachlan is of opinion that our insect is specifically 

 distinct from that of Tasmania. 



Family EPHEMERID^. 



The may-flies are distinguished by their unequal wings, 

 their short antennae, and by their long caudal setas. The 

 eggs are deposited in water. The larvae are shaped like 

 the imago, but have long jaws and false gills on each side 

 of the abdomen. The active pupa, or nymph, crawls to 

 the surface of the water and casts off the pupa-skin, and 

 appears to be fully developed, although it is still covered 

 with another very delicate pellicle, and in this stage is called 

 the subimago. It then flies with difificulty to the shore 

 and casts the thin pellicle. The caudal setae grow some- 

 times to twice their former length, and it flies away as the 

 imago. 



The anterior margin of the wing is called the "costal" 

 nervure, and immediately below it is the " subcostal "; and 

 below that is the "radius": none of these are branched. 

 Next comes a nervure which branches very near the base 

 of the wing into an upper, called the " sector," and a lower, 

 called the " prebrachial " ; further on the sector sends out a 

 second lower branch, the "cubitus," which thus lies between 

 the sector and the prebrachial. Starting again from the base, 

 three longitudinal nervures branch off together, the upper of 

 which is called the " pobrachial," the middle the "anal," and 

 the lower the " axillary " nervure. 



