NORTH AMERICAN NEURGPTERA. 



331 



PSOCID^. 

 The head is large, the protliorax very small, the body soft ; the 

 wino-s with a few curved veins; the hind wings smaller than the 

 fore wings ; the antennje long. 



Fig. 2. — A Psocid. 

 I, costal: 2, subcostal ; 3, radius; 4, cubitus; 5, anterior branch of radial sector ; 6, pos- 

 terior branch of radial sector ; i, 2, 3a, posterior cells ; P, pterostigma ; d, discal cell. 



I 



Key to the Genera. '. 



1. — Wings with scales and long hairs Aniphientoiiiiiiii. \ 



Wings without hairs and scales, hyaline ■> 



2.-- Tarsi 3-jointed '.i. 



Tarsi 2-jointed 4. 



3.— Discoidal cell closed iVIyopsofiis. 



Discoidal cell open. ElipsoeiiM. \^ 



4. — Discoidal cell closed 5. 



Discoidal cell open 6. 



.=S — Discoidal cell four-sided P.S4»cii>it. / 



Discoidal cell five-sided AnipliigeroiitiH. - 



6. — Third posterior cell elliptical Ca^ciliii!«. > 



Third posterior cell elongated l*olypsocii<«. 



Third posterior cell absent Feripsocns. 



Order SIBITMCOKXI A. 



Suborder PLECTOPTERA. 

 EPHEMERID^. 



The "May flies" are easily recognized by their short antennae, 

 small hind wings and the caudal setre. The larvae are aquatic. 



Fig. 3. — An Ephenierid. 



1, costal; 2, subcostal ; 3, radius ; 4, cubitus ; 5, sector ; cu, cubitus; po, post-branchial 

 pra, prasbranchial ; a, anal ; int, intercalary veins; ax 1, ist a.\il!ary ; ax 2, 2d axillary. 



TRANS. AM. KNT. SOC. XIX. DECEMBKK, 1892. 



