Tittyarp.—Studies of New Zealand Trichoptera. 309 
Pycnocentrodes chiltoni n. sp. (Plate 19, fig. 14; text-figs. 21, 23.) 
d. Total length, 4-5-5 mm. ; forewing, 7-8 mm. ; expanse, 13-5-16mm. 
This insect shows a strong superficial resemblance to Pycnocentria 
evecta and P. aureola McL., its general form and coloration being much 
the same. It may be distinguished from them at once as follows : In 
curving round it in the form of the letter C. The male can at once be 
distinguished further by the absence of the darkly shaded longitudinal 
band of the forewing which is characteristic of the genus P ria. 
The female expands 16-18 mm., and is thus considerably larger than the 
male, but not so large as the female of Pycnocentria evecta. It resembles 
the male fairly closely, but the wings are of a paler colour, with a larger 
area covered with pale-golden hairs. 
Техт-ғ1с. 23.— Pycnocentrodes chiltoni n. g. and Sp., 4. 
Appendages ( х 55). Lateral view. Note the bilobed 
gonapophysis and the soft membranous penis with 
chitinous lateral processes. (10 per cent. KOH pre- 
Text-figp. 23 shows a lateral view of the male appendages, after 
maceration in 10 per cent. KOH solution. The soft, everted penis, with 
lateral chitinous processes, is not visible in the dried insect. The 
gonapophyses are bilobed. 
Types.— Holotype male and series of three paratype males, Cass, 
Canterbury (6th January, 1920, R. J. T.) ; allotype female, and series of 
three paratype females and one male, Nelson (allotype, 29th November, 
1920, A. Philpott): all in Cawthron Institute collection. 
Habitat.—All parts of the South Island; not uncommon. I have 
specimens also from Dunedin; the females of the latter are of a pale- 
testaceous colour, but this may be due to their having been taken late 
in the season. The resemblance of this insect to P. evecta has probably 
caused it to be overlooked, as has been the case with P. aureola also. 
