PLECOPTERA OF NORTH AMERICA 127 



smooth, in others the tip is sharply pointed and smooth, 

 while in still others there is a small semi-membranous, bi- 

 lobed process at the tip of the supra-anal process. All of 

 these specimens agree in coloring, in size and in other 

 structural characters, and we do not feel that the slight 

 differences in structure at the tip of the supra-anal proc- 

 ess justify separating them into species. 



Genus CHLOROPERLA Newman. 



1836. Chloroperla Newman, Ent. Mag., 3:50. 



1841. Isopteryx Pietet Ins. Neurop., p. 301. 



1861. Isopteryx Hagen, Syn. N. A., p. 31. 



1892. Isopteryx Banks, Cat. Neurop., p. 342. 



1907. Chloroperla Banks, Cat. Neurop., p. 13. 



1909. Chloroperla Enderlein, Zool. Anz., 34:388. 



Small pale greenish species 6-9 mm. long. In life bright 

 green. Hind wings without a folded anal area. Closely 

 allied to Alloperla Banks. 



Head a little wider than prothorax; pale yellowish 

 green ; three small black ocelli ; hind ocelli closer to the 

 eyes than to each other. Antennae pale at base, inf uscated 

 towards the tip. Apical segment of palpi slender and 

 small. 



Prothorax transversely oval, uniformly pale or green- 

 ish ; subrugulose. Legs pale, tips of tarsi blackish ; first 

 and second tarsal segments very short, subequal, third 

 tarsal segment long. Wings greenish hyaline, veins pale ; 

 subcosta ends much before the cord ; several costal cross- 

 veins before end of subcosta and one beyond ; radial sec- 

 tor with two branches in the forewing and one in the 

 hind wing; second cubital vein of forewing short and 

 downcurved; second anal vein of forewing branched; 

 hind wing without a folded anal field. 



Abdomen pale. Caudal setae pale, short, with about 8 

 segments. 



Male. Ninth abdominal sternite much produced and 

 rounded behind; tenth abdominal tergite partly cleft; 

 supra-anal process composed of a short upturned trian- 

 gular lobe ; subanal lobes small, unmodified. 



Female. Hind margin of eighth abdominal sternite 

 produced into a rounded subgenital plate. 



Genotype, Chloroperla apicalis Newman, of Europe. 



The genus is represented by only one species that is 

 generally distributed over North America. 



