914 ZOOLOGY INSECTS. 



meters ; setse, 26 millimeters. There is nothing known concerning the 

 previous stages of the North American Perlina; even the different larvae and 

 skins in my collection are not yet thoroughly studied. After a closer com- 

 parison with a nympha skin of A. abnormis, communicated by B. Walsh, I 

 believe that the nympha skin from the Eagle River belongs to the same 

 genus, but certainly to a different species. It is not so much spotted ; the 

 apical half of the wing cases is pale, without the black band, so conspicu- 

 ous in A. abnormis; the abdomen is dark brown above, without the regu- 

 lar paler marks of A. abnormis; the basis of the blackish setse is pale 

 instead of the throughout dark color of the setse of A. abnormis. Even 

 the size of the skin seems too large for the known American Perlids, except 

 for some very large specimens of A. abnormis, collected at the Saskatchewan 

 River. 



HAB. Assuming the above described specimens to belong to A. abnor- 

 mis, this species would have a very wide distribution. The northern limits 

 known are the Saskatchewan and Peel Rivers and Canada; the south- 

 ern limits, Georgia, and perhaps Mexico. It is known from all Eastern 

 States on the Atlantic, and from many States between the Atlantic and the 



Rocky Mountains. 



DICTYOPTERYX. 



DICTYOPTEEYX SIGNATA, Hagen. 

 Dictyopteryx signata, HAGEN, U. S. Geol. Surv. Terr., 1873, 575. 



Yellowish-brown, pale beneath ; labrum pale brown ; head flat, with 

 two irregular brown stripes, with an anterior rounded spot, trilobate behind ; 

 space between the stripes with an anterior rounded spot on each side near 

 the eyes. Antenna pale brown ; first joint blackish-brown above, second 

 and third pale ; palpi pale. Prothorax as broad as the head, nearly square, 

 brown, with a large, yellow, median band, somewhat dilated at the ends ; 

 on each side three carved marks, formed, by rather irregular black, polished 

 scars ; lateral margin straight ; whitish around the base of the feet ; seg- 

 ments darker at the base. Feet pale brown ; femora with an external vitta 

 and a ring before the knee ; base of the tibiae and tip of the tarsi dark fus- 

 cous. Setse pale brown, darkest at the tip of the joints. Wings with a 

 grayish-yellow tinge, darker on the costal margin; veins brown, darker, 



