NEUROPTERA. 



563 



jointed, filiform or setiform, the eyes of medium size, and the 

 live-jointed. The prothorax is always freely moveable, and the abdo- 

 men is composed of eight or nine segments. The nervous system is 

 similar to that of the Orthoptera, and consists of clearly distinct 

 thoracic and abdominal ganglia. There is always a muscular gizzard 

 on the digestive canal (Myrmeleontidce, Panorpidce). A sucking 

 stomach is found only in the Henierobidw. Six to eight long Mal- 

 pighian tubes arise from the hindgut. The metamorphosis is always 

 complete. The larva* prey on other animals, and are provided with 

 biting or sucking forceps (formed from the mandibles and maxilla'). 

 They pass into a quiescent 

 pupal stage, in which the parts 

 of the winged insect can al- 

 ready be made out. The pupa 

 is often surrounded with a 

 cocoon, but possesses the power 

 of locomotion to a certain de- 

 gree, since before the animal 

 passes out of the pupal stage 

 it ceases to be quiescent and 

 seeks out a place suitable for 

 development. Fossil remains 

 are found in tertiary forma- 

 tions and in amber. 



Sub-order 1. Planipennia. 

 Front and hind wings similar, 

 never capable of being folded. 

 The mouth parts are powerful 

 and adapted for mastication. 



Fam. Sialidae. With large head 

 bent obliquely forwards, and pro- 

 jecting hemispherical facetted eyes. 

 The wings, when at rest, overlap one another like the slates on a roof. 

 The larvee have biting mouth-parts, with four-jointed maxillary palps and 

 three-jointed labial palps. Sialix lutfirin L., Curi/rfalis en r nut a L.. lia/ihiilti/ 

 (>j>hiiij>x/x Schum. camel-neck flies. 



Fam. Panorpida? (Sclmabelflicgen). The head is small and placed vertically : 

 the multi articulate antennas are placed in the frontal region beneath the ocelli. 

 The oral region is prolonged in the form of a beak. The wings are long and 

 narrow, and similar to each other. The larvaj are like caterpillars. They have 

 thirteen segments and a heart-shaped head, and biting month-parts. They live 

 in damp earth, where they dig horseshoe-shaped passages, and are transforme 1 

 into pupae in oval cavities. Pinmrjin cuiinmniix L. (tig. 46(5). Slttucim 

 ivx Fabr. 



FIG. -167. 11, Larva of 3Imifiisji(t styriaca after 

 hatching, b, The same before the pupal stage 

 (after F. Brauer). c, Zfantlspa jingmta (rescue 

 animal). 



