64 MODERN CLASSIFICATION OF INSECTS. 
parallelas [straw-worms] 
transversas et breviores, quibus interdum admiscentur lapilli 
et conchule ; 
festucas nullas adherentes, sed lapillos aut arenulos que vel 
teretes, [cod-baits } 
planz, seu compress, 
lapillis majusculis, thecze lateribus adhzrentibus nunquam 
supine aut prone parti ; 
nullis ad latera adheer. lapillis, sed theca utrinque in 
tenuem marginem, seu limbum procurrente velut alas 
quasdam, theca planiore et compressiore quam in 
superiore. 
incurvis seu cornutis mavis dicere. Sunt enim horum theca 
incurve, et una extremitate majore, altera minore.” 
The Rev. J. Morton, also, in his History of Northamptonshire, 
chap. vii., has entered into many particulars relative to these larve 
and their cases, as has also Sir Humphrey Davy, in his Salmonia. 
See also Insect Architecture, chap.x. Isaac Walton has also given 
many particulars of these insects, especially as regards their piscatorial 
qualities, and which he calls cadis, pipers, cockspurs, straw-worms, or 
ruff-coats. In Mr. Ronald’s Flyfisher’s Entomology various moderate- 
sized species of Phryganez are termed sand-flies, grannums, and cin- 
namon-flies ; whilst one of the Mystacidz is naemd the silver horns. 
The larve of these insects (fig. 68. 10. larva of Phryganea rhombica 
Pictet) are of an elongated, nearly cylindrical form, with a scaly 
head (fig. 68. 11. upper, 68. 12. under side of head of larva of P. stri- 
ata Pictet), furnished with a bilobed upper lip, a pair of strong man- 
dibles, obtuse at the tip, with several short teeth (fig. 68. 13. mand. 
of larva of P. striata Pictet), fitted for gnawing vegetable matters. In 
the larvee of Hydropsyche they are terminated by a more elongated 
tooth ( fig. 68. 15. mand. of larva of H. senex Pictet) ; and these spe- 
cies are more essentially carnivorous than the others. The maxille 
and labrum are small, fleshy, and soldered together ( fig. 68.14. P. 
striata Pictet); the former are terminated by two minute corneous 
points, supposed by Pictet to represent the terminal maxillary lobe 
and palpus, of which there is no other rudiment ; neither does there 
appear to be any labial palpi, except two exceedingly minute points 
on each side of the spinneret, which is also very minute. In the 
larvee of the Sericostome and Rhyacophilz, the maxillary lobes are 
