1872.] 2AT [Hagen. 
Sisyra, living in the water, has on the ventral side of the first seven 
segments of the abdomen false legs, developed as gills, recalling the 
form of lower Crustacea. The skin is generally scabrous or warty, 
and covered by hairs, bristles and spines of different structure, and 
scales, similar to those of the Lepidoptera. 
The eggs are always of an oval shape, usually with a little knob 
containing the micropyle. The embryo opens the eggs with an egg- 
burster like a saw, and changes the skin in hatching. The larva 
moults several times, and spins for transformation a silky or paper- 
. like cocoon, with the spinnerets on the tip of the abdomen. The 
size of the cocoon is often remarkably small for the size of the 
imago. The nympha is inactive, and breaks open the cocoon for 
transformation with its great hatchet-shaped mandibles, the skin 
remaining in the opening. A pink egg-shaped body, probably be- 
longing to the spinning organ is ejected by the newly transformed 
imago, at least, in the Myrmeleonina. All larve of the Hemerobina 
are very rapacious, and therefore beneficial. 
The Hemerobina may be divided into the following sapere 
1. Myrmeleonina. 
Mandibles long, inwardly arcuated, with three teeth; antenne 
shorter than the mandibles. Body flat, broad, large; hind legs stout, 
short, tibia and tarsus connected; claws large, two in number; no 
pulvillus. To this group belong the Myrmeleonina and Ascalaphina, 
the latter with flat lobes on the thorax and abdomen. 
2. Wemopterygina. 
Mandibles short, inwardly arcuated; antenne short; prothorax 
strongly elongated; body flat, broad. No pulvillus between the two 
claws. 
3. Osmylina. 
_ Mandibles long, outwardly arcuated; antenne short; body elon- 
gated; a small pulvillus; two claws. 
4. Sisyrina. man 
Mandibles long, outwardly arcuated; antennz longer; body elon- 
gated, slender; abdomen with seven pair of ventral gills; tarsi with 
_ only one claw, no pulvillus. 
5. Flemerobina. 
Mandibles long or short, eedla arcuated; antenne longer; 
body elongated ; two claws; a well developed pulvillus. 
Here belong Drepanopteryx, Hemerobius, Chrysopa, Hypochrysa. 
