
No. 428.] 

M. Anit 
+h 
x 60; 4, labium. 
FIG, 2. 
a, maxilla, 

THE METAMORPHOSIS OF SISYRA. 
617 
but six on the lateral. Each 
of these is provided with a 
long hair. Their purpose 
seems to be for protection, 
as the floating particles 
retained in them make the 
insect look very much like 
a diminutive piece of aquatic 
vegetation. The same thing 
is described by Kent for 
Hemerobius, where the pro- 
tection is furnished by the 
dead bodies of its victims, 
the aphids which are held 
by the long hairs. On the 
seventh and eighth abdominal segments there is an additional 
pair of hairs on shorter pedicels, near the median line. 
eighth segment there are two dor- 
sal and two lateral projections, more 
elongate than those of the other 
segments, each of which serves as 
a pedicel for three hairs. The ninth 
has only the lateral projections. 
The tenth segment is everted at 
the end to serve as a spinneret for 
ejecting the silk. In sections the 
chitin on this part is noticeably 
thinner than that covering the rest 
of the body. Between the head and 
prothorax on the dorsal side is a 
small interpolated sclerite, men- 
tioned by Grube, and also by Hagen 
in his description of Osmylus. 
There is no trace of it, however, 
on the ventral side. In Chauliodes, 
an insect which has the mouth parts 
normally directed upward rather 
than downward, as is the case with 
On the 

Fic. 3. — Sisyra umbrata, pupa. 
x 2t. 
