514 INVERTEBRATE MORPHOLOGY. 



transforms into a maggotlike second larva which lives upon the honey on 

 the surface of which it floats, and after a time passes into a resting pseudo- 

 chrysalis stage, from which a larva similar to the second one emerges, and 

 this finally transforms into a pupa which gives rise to the adult. 



10. Order Neuroptera. 



The Neuroptera are characterized by the abundant and 

 rich venation of their wings, in which numerous cross-veins 

 extend between the longitudinal ones. The mouth-parts are 

 adapted for biting, the mandibles being in some forms (Cory- 

 dalis) very large. The lace-winged flies (Chrysopct) also be- 

 long to this group, as does also the Ant-lion (Myrmdeon, Fig. 

 240), whose larva excavates a funnel in loose sand, and 

 buries itself at the bottom with only the head and powerful 



FIG. 240. Myrmeleon obsoletus (from PACKARD). 



mandibles projecting, ready to snap up any insect which slips 

 down the yielding sides of the trap. The larvae are usually 

 Thysanuriform, those of Chrysopa attacking Aphides, whence 

 they are frequently termed Aphis-lions, while those of C'ory- 

 dalis are aquatic and possess tracheal branchiae upon the 

 abdomen. This larva is familiar to anglers as the Hell- 

 gramite. The metamorphosis is complete. 



11. Order Panorpata. 



This order contains a small number of forms, the majority 

 of which possess membranous wings resembling those of the 

 Neuroptera, except that the cross-veins are not so numerous. 

 The anterior part of the head is produced into a downwardly 

 projecting snout, at the extremity of which are the small 

 biting mouth-parts, the arrangement recalling that found in 

 the Curculionidae among the Coleoptera. In the genus Pa- 



