46 Key to Families of North American Insects. 



9. Wings acute at apex; outer margin of fore wings distinctly emarginate, cross- 

 veins with bristles; hind wings with a fork to the cubitus that extends very 



close to the hind margin. (Lomamyia) BEROTHIDiE 



Outer margin of fore wing not emarginate, crossveins not bristly. (Sisyra, 

 Climacia) SISYRID.S^ 



ORDER PANORPATiE. 



(MECOPTERA.) 



Small to moderate-sized predatory insects with the head drawn 

 out to form a sort of beak; wings when present long, narrow and 

 similar, crossveins and veins moderately numerous; mandibles 

 small, antennae long and hair-like; prothorax small; legs long, 

 similar, fitted for running; coxse large, pendant and approximate, 

 tarsi five-jointed; abdomen usually slender, cerci small, ninth 

 segment of male greatly swollen and reflexed. Metamorphosis 

 complete, larvse resembling caterpillars. Scorpion flies. 



1. Three ocelli present; winged species, costal margin without crossveins 2 



Ocelli absent 3 



2. Tarsi with two claws; cubitus of fore wings forked near the base. Scorpion- 



flies. (Panorpa) (PI. 9, 6gs. 190, 191, 192, 194) PANORPIDiE 



Tarsi with a single claw; cubitus simple. (Bittacus) (PI. 9, fig. 193). 



BITTACtJSID.^ 



3. Wings well developed, costal cell with many crossveins. (Merope.) 



MEROPID^ 

 Wingless, or with very short wings. (Boreus) BOREID.^ 



s ORDER TRICHOPTERA. 



(PHRYGANOIDEA.) 



Small to medium-sized, slender, flying insects; head movable^ 

 vertical, eyes prominent, ocelli three or none, mandibles vestigial, 

 palpi prominent, antennae thread-like, often very long; prothorax 

 small; wings more or less clothed with hairs, with many veins and 

 a few crossveins, the hind wings with a folded anal area; legs 

 similar, coxse pendant and approximate, tarsi five-jointed. Meta- 

 morphosis complete, larvae aquatic case-bearers. Caddice flies. 



1. Minute, often pretty, moth-like pubescent species, whose anterior wings are 

 closely covered with projecting, clubbed hairs; marginal fringe of wings 

 very long, that of hind wings longer; discal cell of hind wings open or want- 

 ing; wings usually very long and narrow, more or less pointed; antennae at 

 most as long as the fore wings, usually much shorter and usually thickened; 



V 



