273 



T 'aran otoperla, End. In both of these, M s + 4 , after 

 functioning with Cu 1? remains fused with its right to the 



Wing- venation ( x 10) . 



3A U 



Text-fig. 3. 



Dinotoperla carpenteri, n. sp. 



1A, 2A, 3A, the three anal veins; Cu, cubitus; Cu 1; first 

 branch of cubitus, branching, in forewing only, into 

 Cu ia and Cu lb ; Cu 2 , second branch of cubitus; M, media, 

 branching in both wings into M^, and M 3 + 4 , the latter 

 fusing partially with Cu t in hindwing only; R, radius; 

 Rj, its main stem; Rs, radial sector, unbranched in both 

 wings ; Sc, subcosta. 



wing margin. The three known genera may be easily 

 separated by the following Key: — 



(1) Cerci longer than abdomen ; Rs in fore- 



wing, with a long fork Leptoperla, Newm. 



Cerci shorter than abdomen ; Rs. in fore- 

 wing simple ... ... ... ••• 2 



(2) Cu x in forewing, simple; in hindwing, a 



complete fusion between M 3 + 4 and C^ Paranotoperla, End. 

 CUj in forewing, forked ; in hindwing, 

 the fusion between the M 3 + 4 and Ciij 

 is incomplete ... ... ... ... Dinotoperla. Till. 



Genus Dinotoperla, Till. 

 ''Canadian Entomologist," 1921, p. 43, text-fig. 4fr. 



Dinotoperla carpenteri, n. 

 Text-figs. 1, 3, 4. 



Forewing, 10 mm. Expanse^ 21*5 mm. 



Head, thorax, and abdomen dull blackish, touched with 

 dark brown behind the eyes and on notum. Eyes brownish- 

 black. Antennae about as long as forewing, very slender,, 

 with about 50 segments, the basal one slightly enlarged. 

 Pronotum rectangular, broader than long. Legs dull 

 brownish, the apices of the femora and tibiae darkened ; 

 the tarsi darker, except at base of first segment. Cerci rather 



sp. 



