TiLLYARD.—Studies of New Zealand Trichoptera. 303 
in both sexes (suborder Aequipalpia), the last segment not flexible or 
annulated, not longer n the preceding one. Ocelli absent. Median 
cell present in forewing. All five apical forks present in forewing. 
Antennae with first segment enlarged. Genital appendages of the male 
with strongly developed pre-anals. 
Genus PHILORHEITHRUS Hare, nomen emendatum. (Text-figs. 17, 18.) 
Philorheithous Hare, Trans. N.Z. Inst., vol. 42, p. 32, 1910. 
Hare gives the derivation from реброу == a stream, from which it 
would appear that Philorheithous is a lapsus calami, or misprint for 
Philorheithrus. 
The genus needs to be redefined as follows :— 
Head subrectangular, broader than long, very hairy; antennae with 
the first segment stout, cylindrical, as long as the next three taken 
together; total length of antenna about as long as that of forewing, 
Text-Fic. 17.—Philorheithrus agilis (Hudson), ¢. Wing-venation. 
(For lettering see p. 314.) 
sometimes longer, sometimes shorter. From beneath the antennae there 
projeets, in the male only, a pair of very hairy processes, about half as 
long as the first antennal segment (text-fig. 18 a-c); they appear to 
be homologous with the ''pilifers " of Lepidoptera. Maxillary palpi with 
the first segment short, swollen distally on the inner side into a small 
knob (text-fig. 18d) ; the succeeding three segments elongated, cylindrical, 
each a very little longer than the one succeeding it; distal segment 
distinctly narrower than rest. Labial palpi with first segment little more 
than half as long as second ; second and third about equal. 
