TRICHOPTERA. — PHRYGANEIDZ. 61 

than, the body (as in Leptocerus (Mystacida) niger, fig. 67. 7.) slen- 
der, setaceous, and multi-articulate. The mouth is neither fitted for 
mastication nor suction; it consists of an elongated, slender upper lip 
(fig. 67. 3., after Savigny), at the base of which, on each side, ac- 
cording to Savigny (Mém. An. S. Vertebr., pl. 1.), Curtis (Brit. Eint., 
pl. 592.), and Percheron (Gen. Ins. Neur., pl. 3.), is to be perceived a 
minute, soft, pubescent, and trigonate organ (fig. 67. 3.°°.), which 
is the representative of the mandibles (which are erroneously stated 
by Latreille and Pictet to be “ nulles”); the maxillz are also small, 
and terminated by an oval pubescent lobe ( fig. 67. 4.); the maxillary 
palpi are long and slender, being only 4-jointed* in the males of the 
large species (fig. 67. 5.), but 5-jointed in the females ( /ig. 67. 4.). 
In the genus Phryganea, &c., the joints are of nearly equal thickness, 
and similar in their appearance; but in Hydropsyche (fig. 67. 8. 
maxillary, 67. 9. labial palpi), &c., the terminal joint is very greatly 
elongated, and much more slender than the preceding, and annu- 
lated; and in the Mystacide they are thickly clothed with hairs. 
The mentum is distinct and quadrate ; the labium produced and entire ; 
and the labial palpi 3-jointed (fig. 67. 6. P. grandis), and partaking of 
the character of the maxillary palpi. The prothorax forms a very 
short collar. The meso- and meta-thorax are dilated into an oval or 
orbicular mass. The anterior wings are elongated and lanceolate in 
the females, but rather more obtuse in the males of the true Phry- 
ganeez ; they are deflexed at the sides of the body during repose, and 
* Pictet describes them as only 3-jointed in the males of the true Phryganex. 
Curtis and Percheron, however, figure them as 4-jointed. ‘In the males of the 
other genera, they do not differ from the females in the number of joints. In the 
males of Sericostoma (Phryganea personata Spence, Introd. to Ent., vol. iii. p. 489., 
Sericostoma Spencii Steph.), the maxillary palpi, in the ‘males, are short and di- 
lated, uniting in front of the face, and forming an obtuse rounded mask ( fig. 67. 10.). 
