388 NATHAN BANKS. 



Ascalaphinse. 

 1. — Eyes sulcated 2. 



Eyes entire Plynx. 



2. — Hind margin of wings entire ITlllla. 



Hind margin of hind wings excised C'olobopteriis. 



Suborder MECAPTEEA. 

 PANOPID^. 



The "Scorpion-flies," as they are called, because of the peculiar 

 structure of the male u;enitalia, are a very well defined group. They 

 are the ancestors of the Diptera. Our forms, though not uncommon, 

 are not numerous. Panorpa is restricted to the Eastern States. The 

 larvae have pro-legs like caterpillars. 



Key to the Genera. 



1.— Three ocelli 2. 



Ocelli absent 4. 



•2. — Two claws to tarsus. 3. 



One claw to tarsus Biltacus. 



.3. — Tarsal claws serrated Paiiorpa. 



Tarsal claws simple Panorpodes. 



4. — Wingless, or wings very short Boi'CiiS. 



Wings well developed Merope. 



Order TRICHOPTERA. 



Although quite a number of species have been described from our 

 country, but little good work has been done. The classification is 

 in a very unsatisfactory form. The forms are common, easily col- 

 lected, and not more difficult of study than moths. They are the 

 stock from which Lepidoptera have sprung. I divide the order into 

 seven families, which may be separated as follows : 



1. — Spines on the legs, three ocelli 2. 



No spines, only hairs and spurs 3 



2.— Four spurs on middle tibiae PHRYGANID.^. 



Two or three spurs on middle tibiae LIMNEPHILID^. 



3. — Last joint of palpi not elongated, simple, not flexible 4. 



Last joint of palpi elongate, flexible, palpi hairy 6. 



4. — Male palpi 4-jointed, ocelli absent 5. 



Male palpi 5-jointed, ocelli often present, when absent the spurs 2-4-4. 



RHYACOPHILID^. 

 ."j. No spurs on anterior legs HYDROPTILID^. 



Spars present on anterior legs SERICOSTOMATID^. 



