350 ZOOLOGY. 
The plant-louse (Fig. 830, Aphis mati Fabr.) is provided 
with two tubes on the hind-body from. which honey-dew 
drops, which attracts ants, wasps, etc. In summer the 
endl fees Fig. 829.Apple Aphis. Natural size and 
size and enlarged. enlarged. 
plant-lice reproduce asexually, and as there may be nine or 
ten generations, one virgin aphis may become the parent of 
millions of children and grandchildren. 
Order 9. Neuroptera.—We now come to insects with a 
complete metamorphosis. All the foregoing orders are 
1900 ¢ ametabolous, the species 
}/ passing through an incom- 
ee” pnt plete metamorphosis, the 
Fig. 330.—Chrysopa and group of stalkea larvee resembling the adult. 
eges. This order is now restricted 
to those net-veined insects with a complete metamorphosis, 
the mouth-parts free, adapted for biting, with the ligula 
entire and large, broad, flat, and rounded, while the pro- 
thorax is large, broad, and square. The group comprises 
the Stalide (Corydalus) and the Hemerobiide (Chrysopa, 
Mantispa, Rhaphidia, and Hemerobius).* 
Order 10. Mecoptera.—The scorpion-flies are represented 
by a single family (Panorpids), with the typical genera 
Panorpa and the wingless Boreus. They are net-veined 
insects, but differ from the Newroptera in the caterpillar- 
like Jarvee and in the imagines having a minute rudimentary 
ligula, the head being elongated, with minute mandibles 
atthe end of the snout. The maxille are long, and connate 
with the labium. 
Order 11. Trichoptera.—The group of caddis-flies, whose 
* See Hagen’s Synopsis of North American Neuroptera. 
