84 ENTOMOLOGY 
tera (Chrysopide, Myrmeleonide), and in various larvae 
whose pupz are suspended from a silken support, as in the 
coleopterous families Coc- 
BrGe 103: 
cinellidze and Chrysomel- 
ide (in part) and the dip- 
terous family Syrphide, 
as well as most diurnal 
Lepidoptera. 
Fic. 104. 
Head of caterpillar of Samia cecrepia. a, 
antenna; c, clypeus; J, labrum; /p, labial palpus; 
m, mandible; mp, maxillary palpi; o, ocelli; s, 
spinneret. 
The silk glands of caterpillars 
are homologous with the true 
salivary glands of other ‘insects, 
opening as usual through the hy- 
popharynx, which is modified to 
form a spinning organ, or spi- 
neret (Fig. 103). The silk glands 
of Lepidoptera are a pair of long 
tubes, one on each side of the 
body, but often much longer than 
the body and consequently convo- 
luted. Thus in the silk worm 
(Bombyx mori) they are from 
four to five times as long as the Silk glands of the silk worm, 
: 5 Bombyx mori. cd, common duct; 
body and in Telea polyphemus, Gee ee te Ree 
seven times as long. In the silk  Filippi’s glands; gi, gland proper; 
p, thread press; r, reservoir. 
d, one of the paired ducts; g, g, 
worm the convoluted glandular 
portion of each tube (Fig. 104) opens into a dilatation, or silk 
reservoir, which in turn empties into a slender duct, and the 
