132 Eev. A. E. Eaton on 
M'Laclilan. When he saAv a drawing of the maxillary 
palpus oi Phrixocoma sparsa $ , he remarked at once its 
likeness to the palpus of Rhyacophila. 
Besides the mouth organs, the appendices of the male 
are seen with advantage in fluid. 
For the investigation of their neuration it is necessary 
to denude the Avings of their hair. This can be done with- 
out difficulty if the wing detached from the thorax be laid 
on a smooth sheet of paper and carefiilly brushed with a 
fine camel's hair pencil. The fringes may be lefl in situ, 
as they do not interfere with the view, and they are not 
easily removed. 
A7i Analytic Table of the Genera of the Ilydroptilidas. 
, j Ocelli present . . . . • . . . . . 2 
( Ocelli absent . . . . . . . . . . • . . . . . 5 
g ( Spurs 1, 3, 4. Wings acuminate . . . . . . Hydroptila. 
I Spurs 0, 3, 4 . . . . . . . . . . . . . . . . 3 
3 
Anterior wings rather obtuse . . .. .. .. Agraylea 
Wintrs acuminate . . . . . . . . . . . . . . 4 
. f Anterior inner edge with an appendage . . . . Ithi/trlch'ia 
I Anterior inner edge entire .. .. .. .. Oxijeth'tra 
f. ( Spurs 0, 3, 4, wings acuminate .. .. .. Orfliotricltia 
"* I Spurs 0, 2, 4, wings acuminate .. .. .. Phri.vocoimi 
Genus Phrixocoma, nov. gen. 
Neuration, PI. II. 1 — 1 a : maxillary palpus, III. 1 b. 
Hydroptila, Curt. 1834 ; nee Dalman. 
Derivation. — (Gr.) Plirixo-komes, with bristling hair. 
Imaffo. Antennae in the male about half as lons^ as 
the wings, in the female a quarter as long ; stout, monili- 
form, with coarse adpressed hair which gives to the joints 
a somewdiat scutiform outline, the basal joint longer and 
thicker than the others ; in rejiosc laid together horizon- 
tally, but during a halt in running slightly divergent and 
ascending. Head and prothorax with coarse shaggy hair. 
Ocelli absent. JNIaxillary pal]ii five-jointed, filiform, with 
moderate, short, spreading pubescence ; the first two joints 
very short, subequal ; the third and fourth joints long, sub- 
equal; fifth joint rather the longest. Labial jialpi fiUform, 
with the apical joint as long as the other two together. 
A^'ings lanceolate, acute : the anterior scabrous, with very 
long fringes, in both sexes Avith a short a])pendage to the 
inner margin near the base wlience a fold is produced for- 
