Vorhies—Studies on the Trichoptera of Wisconsin. 711 
Phytocentropus maximus nov. sp. 
Imago .—Length of body, male, 7 mm.; female, 10 mm. Ex¬ 
panse, male, 21 mm.; female, 28 mm. Antennae of males 
longer than of females. Antennae yellowish, obsoletely annu- 
lated with brown in the middle of each joint at the base, darker 
toward the tips, basal joint bulbous, clothed with brown hair 
beneath and yellow hair above. Face brown, palpi brownish- 
yellow. Head, thorax and abdomen dark brown above, the lat¬ 
ter paler beneath. A large transverse wart between, and back 
of, the bases of the antennse, a large pair on the posterior outer 
portion of the head, a small pair anteriorly and a large median 
one posteriorly on the mesothorax, and the wing callosities, all 
clothed with yellow hair. Legs luteo-fulvous, the coxse browner. 
Anterior wings with blackish hair, guttate with yellow, a larger 
obsolete spot of yellow above the 5th apical fork; darker spots 
at arculus, at tips of branches of 5th fork, at cross-vein between 
radius and discoidal cell, and diagonally across the middle of 
the lower branch of the media. Veins brown. Posterior wings 
gray with gray hair, except a little yellow hair along the costal 
margin. 
In the male the superior appendages are yellow and the in¬ 
ferior dark brown. The 9th dorsal segment is represented by a 
median plate excised in the middle, and bearing upturned 
hooks at the outer angles. What appear to be the superior ap¬ 
pendages are leaf-like, arising at the base of the dorsal plate, 
low down, and pointing upward so as to hide the plate in lateral 
view. The penis projects from beneath the dorsal plate, curv¬ 
ing downward. Ho intermediate appendages seem to be pres¬ 
ent. The inferior appendages are stout, strongly hairy, appear¬ 
ing leaf-like from the side, but from beneath they are seen to 
be thick and fleshy, nearly meeting along their median surfaces, 
which are black and thickly set with black spines. 
The measurements given are from a single pair of expanded 
specimens. Alcoholic material shows that this is rather an ex¬ 
treme range of sex difference, though the females average lar¬ 
ger than the males. 
Larva. —Length, 15-16 mm. Width 2 mm. Head and 
prothorax very small, about .6 mm. in width. Body whitish, 
