274 



short, 10- to 11-segmented, tapering, delicately haired, the 

 basal segment thickest and much longer than any of the next 

 few succeeding segments. In the male, the superior 

 appendages are slender, elongated, curved processes, project- 

 ing on either side of the penis, the basal portion of which is 

 a broad plate, the distal portion slender and upcurved. 

 The cerci and appendages of the male are figured in 

 ventral view in text-fig. 4. In the female, the ven- 

 tral plate is deeply bifid, 

 a deep triangular median 

 notch dividing it into 

 two triangular pieces. 



Wings : — Forewing 

 medium fuscous, with 

 irregular paler subhyaline 

 spaces between the cross- 

 veins; i.e., each cross- 

 vein is surrounded by a 

 rectangle of the fuscous 

 ground-colour, and the 

 spaces between these rect- 

 angles are paler. As the 

 positions and number of 

 these cross- veins is incon- 

 stant, varying for each 

 individual, the pattern 

 thus produced is very 

 irregular, and is never 

 very conspicuous. Hind- 

 wing a uniform medium 

 fuscous. When at rest, 

 the dark and pale areas 

 of the two wings appear to reinforce one another, giving the 

 insect a distinctly banded appearance, as shown in text-fig. 1. 

 Dedicated to F. W. Carpenter, M.A., late science master 

 at Sydney Grammar School, in memory of many happy days 

 spent in the field together studying aquatic insects. 



Locality: — Hornsby, near Sydney, N.S.W. Bred from 

 larvae found on rocks in a small stream in Old Man's Valley; 

 also found sitting about on the stems of reeds and grass near 

 the stream. July to October. 



Types : — Holotype (Hornsby, Sept. 14, 1917, R. J. T.) 

 and series of para-types in Tillyard Collection, Cawthron 

 Institute, Nelson, N.Z. 



The set specimens have the abdomens so shrivelled that it 

 is impossible to determine the sex or study the sexual append- 

 ages. The descriptions of these organs given above were made 

 from slides prepared from specimens of the para-type series. 



(x57). 



