174 ENTOMOLOGICAL NEWS. [May, '06 



On the Perlid Genus Chloroperla. 



BY NATHAN BANKS. 



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The genus Chloroperla was first described by Newman in the 

 third volume of the Entomological Magazine, page 500 ; the 

 number for April, 1836. He separates the genus from Perla 

 because the subcosta and costa are parallel, and on account of 

 the few cross-veins in this region of the wing. He says that 

 the genus includes several species, and mentions Ch. viridis 

 Fabr. , and Ch. lutea L,atr.,and describes a new form Ch. 

 apicalis. In August, 1836, appeared part of Vol. VI, Mandi- 

 bulata, of Stephens' well-known "Illustrations," containing, 

 on page 137, the genus Chloroperla Newman MSS. This, how- 

 ever is not important as Newman's own publications of the 

 name antedates Stephens by several months ; so that the type 

 of the genus must be found among the three names given by 

 Newman. In 1839 (Mag. Nat. Hist., n. ser. , Vol. Ill, p. 87) 

 Newman again treats of the genus Chloroperla, dividing it into 

 two sections, aberrant and normal species. Among the normal 

 species are the three names of his first article ; viridis Fabr., 

 and lutea L,atr. , appearing as synonyms of C. flava Fourc. , a 

 possible synonym of C. tripunctata Scop. This synonomy is 

 not accepted by European authors, and the three names of 

 Newman's first paper on Chloroperla are reduced to tripunctata 

 Scop, and apicalis Newm. Both of these species are placed in 

 the genus Isopteryx by the European writers on Perlidae. 

 Therefore Chloroperla Newm., 1836, replaces Isopteryx, Pict. 

 1841. Chloroperla of authors has no synonyms; the species 

 of Leptomeres Rambr., and Dodecatoma Dufour, are placed in 

 Isopteryx. So the Chloroperla of Pictet and later authors is 

 without a name. 



In Bull. No. 47, N. Y. State Museum, 1901, page 417, Mr. 

 Needham divides the family Perlidae into- two subfamilies 

 Perlinse and Nemourinse. He bases these groups on the con- 

 dition of the median vein near base of wing ; fused with the 

 radius in the Nemourinse, distinct and parallel to the radius in 

 the Perlinse. There are various exceptions to this rule in 

 both groups, but especially among those forms previously 

 placed in the genus Chloroperla. This character is not of suf- 



