NATHAN BANKS. 203 



in color, and with very few costal cross-veins, Diamphipnoa, 

 which has many costal cross-veins, and Eiisthenia with partly 

 red or violaceous wings, Diamphip7ioa has lichen-green 

 wings, and the median series of cross-veins in fore wings is 

 crossed. 



Diamphipnoa lichenalis Gerst. has the anterior coxae widely 

 separated ; last joint of tarsi longer than the two others 

 together ; ocellar triangle longer than broad behind ; the 

 subcosta runs into the radius at tip ; many of the median 

 cross-veins crossed ; a series of cross-veins in the cubito- 

 anal region (not in Pteronarcys) . 



Etisthenia ihalia and E. diversipes belong to Austroperla. 

 There are no series of cross-veins in the cubito-anal space, 

 and the costal area has cross-veins all along ; the anal cell 

 has two branches, setae very short. The two species are 

 very similar. The genus Heteroperla Hare is a synonym of 

 Austroperla. 



The Leptoperlini is the group of Antarc toper la of Ender- 

 lein ; small, slender, dark species, looking much like Ne- 

 mourini but with many cross-veins, sometimes only indi- 

 cated, in the apical part of wing. The type of Leptoperla, 

 L. beroe Newm. has slender legs, long antennae, and long 

 setae, the last joint of tarsus not equal to the basal two ; the 

 radial sector soon forks as seen in figure 29. In L. opposita 

 the setae are shorter, the tarsi have last joint longer, and 

 radial sector is simple, while the cubitus is forked as in 

 figure 30. The genus Parantoperla is very close to L. oppo- 

 sita. Aucklandobius is hardly distinct from Notoperla. 



The genera of this section may be tabulated as follows : 



1. Many costal cross-veins ; setae very short Austroperla. 



Only one or two costal cross-veins 2. 



2. Radial sector of fore-wings forked 3. 



Radial sector of fore-wings not forked 4. 



3. Radial sector forked toward tip ; cubitus forked at the basal cross- 



vein Gripopteryx. 



Radial sector forked near base ; cubitus forked long before the 

 basal cross-vein Leptoperla. 



4. Hind-wings with cubital cross-veins. ..Notoperla {Aucklandobius) . 

 Hind-wings without cubital cross-veins. 



Autarctoperla {Parantoperla). 



TRANS. AM. ENT. SOC. , XXXIX. 



