226 Transactions. 
Art. 20. — Descriptions of Two New Species of May-flies (Order 
Plectoptera) from New Zealand. | 
Ву R. J. Тилхлкр, M.A., Sc.D. (Cantab.), D.Sc. (Sydney), C.M.Z.S., F.L.S., 
Е.Е.8.; Entomologist and Chief of the Biological Department, Cawthron 
Institute, Nelson, N.Z. 
[Read before the Nelson Institute, 19th October, 1921 ; received by Editor, 26th October, 
1921 ; issued separately, 17th February, 1923.] 
Plate 19. 
Tue may-flies, which belong to a very distinct and primitive order, called 
by some authors the Plectoptera, by others the Ephemeroptera, are well 
represented in New Zealand, though the introduction of the various species 
of trout has greatly diminished the abundance of the larger species, and 
one or two of the finest of them appear to be on the verge of extinction. 
Thirteen species, belonging to six genera and three families, have already 
been described, while a considerable number of the smaller species have not 
by Sellards. A paper embodying these results is in course of preparation, 
and will be published elsewhere. н 
The plate showing the male imago and female subimago of Ichthybotus 
bicolor n. sp. has been prepared from a photograph taken by Mr. W. C. 
Davies, Curator of the Cawthron Institute, to whom I here desire to express 
my thanks. The text-figures have all been drawn with the Abbé camera 
lucida. 
Family SIPHLURIDA E. 
Genus AMELETUS Eaton. 
Ameletus flavitinctus n. sp. 
Ф. Imago: Total length, 18 mm.; forewing, 19-5 mm.; hindwing, 
 "mm.; expanse, 41 mm. 
Head (somewhat shrivelled) small, dull medium brown; eyes dull- 
- blackish. 
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