COJIYDALIS. INSECTS. 333 



TRIBE VII. SEMJBLIDES, Megaloptera. 

 Five joints in all the tarsi ; prothorax large ; wings horizontal 

 or deflexed, the internal side of the lower bent or folded be- 

 low ; antennae filiform or setaceous, sometimes pectinated ; 

 maxillary palpi projecting, slenderest towards the end, and 

 the last joint often short. 



This tribe are aquatic in their first age. Metamorphosis incomplete. 

 Gen. CORYDALIS, CHAULIODES, SIALIS. 



Gen. CORYDALIS, Lat. Hemerobius, Lin. 

 Five joints in all the tarsi ; first segment of the trunk large ; 

 wings horizontal ; mandibles very long, narrow, pointed, ad- 

 vanced in form of horns ; antennae setaceous and simple. 

 C. cornuta, Lat. Inhabits Africa and North America. De Geer, iii. 

 pi. 27, fig. 1. 



TRIBE VIII. PERLIDES. 



Three joints in all the tarsi ; prothorax square ; body narrow, 

 elongated, depressed, with the wings horizontal ; abdomen 

 terminated by two setae or articulated filaments, and the man- 

 dibles small and in part membranous. 

 Gen. NEMOURA, PERLA. 



Gen. PERLA, Geoff. Phryganea, Lin. 



All the tarsi with three joints ; wings horizontal ; first segment 

 of the trunk large; antennae setaceous, with many joints; 

 mandibles almost membranous ; labrum indistinct ; two long 

 filaments at the anus ; thorax flattened. 



The larvae of this genus are aquatic and carnivorous. They cover themselves in 

 a case, which they move about with, and in this case undergo their metamorphosis. 



P. lutea, Lat. (Semblis viridis, Fab.) Antennae yellow, with the 

 extremity brown ; eyes black ; head and thorax yellow ; wings 

 pale, much longer than the body. Inhabits Europe, at the mar- 

 gin of fresh waters. Nouv. Diet. xxv. 286. 



FAMILY IV. PLICIPENNES, Phryganides. 



No mandibles ; inferior wings broader than the superior, and 

 folded longitudinally ; antennae setaceous, generally long, and 

 composed of numerous joints ; tarsi with five joints; maxillary 

 palpi generally long and setaceous. 



The larvae are aquatic, and live in cases which they form of various materials. 

 Gen. PHRYGANEA, MYSTACIS, (P. nigra. Fab.) ; HYDROPTILUS, (Dal- 

 man ;) SERICOSTOMA. 



Gen. PHRYGAXEA, Lat. Lin. 



Head small ; inferior wings large and folded ; tarsi with five 

 joints ; mandibles almost none ; antennae long and setaceous ; 

 four setaceous palpi, the anterior ones long, with five joints ; 

 posterior feet long, with the legs spinous. 



The larvse of this genus ate aquatic, and form for themselves a cylindrical case oc 



