204 INSECTA. 
of its four anterior feet, which are free, and furnished with thick 
fringes of hairs. The nymphs of the large species leave the water 
altogether, and climb on various bodies, where their final change is 
effected. The small ones simply rise to the surface, where they are 
transformed to winged Insects, in the manner of the Culices and va- 
rious Tipularie ; their exuvium serves them for a boat. 
In some the inferior wings are evidently wider than the others, and 
plaited. 
Sericostoma, La 
Where, in one of the sexes, the maxillary palpi are in the form of 
valvule, covering the mouth in the manner of a rounded snout, and 
triarticulated; under them isa thick and cotton-like down. Those of 
the other sex are are filiform, and consist of five joints *. 
PHRYGANEA proper, 
Where the mouth is similar in both sexes, and the maxillary palpi 
are shorter than the head and thorax, and but scarcely pilose. 
P. grandis; Rees.; Insect., II, Ins. Aq. cl, 2, xvii. The largest 
species in France; antenne as long as the body; superior wings 
greyish-brown, with cinereous spots, a longitudinal black stripe, 
and two or three white dots at their extremity. 
The tube of its larva is invested with little pieces of bark, or 
ligneous matter arranged horizontally. 
P. striata, L.; Geoff., Insect., I, xiii, 5. About an inch long; 
fulvous; eyes black; nervures somewhat darker than the rest of 
the wing. 
P.rhombica; Rees., Insect., Il, Ins. Aq., el, 2, xvi. Length 
seven lines, and of a brown yellow; a large, white rhomboidal, 
and lateral spot on the superior wings. 
The tube of its larva is covered with little stones and frag- 
ments of shells f. 
Certain species, such as the filosa, quadrifasciata, longicornis, 
hirta, nigra, have excessively long antenne, and maxillary palpi also 
extremely long and densely pilose. They form the subgenus 
Mysracipa, Lat. 
In the others the four wings are narrow, lanceolate, almost equal, 
and without plice. To this division belongs the 
Hyprorrita, Dalm., 
Where the antennz are short, almost granose, and of equal thick- 
ness {. 
Another subgenus—Psychomyia—might be formed of Phryganez 
with similar wings, but in which the antenne are long and setaceous, 
* A genus established on a species from the environs of Aix, sent to me by M. 
Boyer de Fons-Colombe, and which has been also brought from the Levant by M. 
de Labillardiére. 
+ For the other species, see Fabricius, De Geer, and Resel. 
} Anal. Entom., p. 26. 
