HAGEN.] ZOOLOGY — PSEUDO-NEUEOPTEEA AND NEUROPTEEA. 575 



previous stages of the IsTorth American Perlina ; even the different larvae 

 and skins in my collection are not yet thoroughly studied. After a 

 closer comparison with a nympha-skin of A. abnormis, commuuicated 

 by B. Walsh, I believe that the nympha-skin from the Eagle Eiver 

 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 conspicuous in A. abnormis ; the abdomen is dark- 

 brown above, without the regular paler marks of A. abnormis ; the 

 basis of the blackish setse is pale instead of the throughout dark color 

 of the setae 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 Eiver. 



Habitat. — Assuming the above-described specimens to belong to A. 

 abnormis, this species would have a very wide distribution. The noi ih- 

 ern limits known are the Saskatchewan and Peel Eiver and Canada ; 

 the southern limits, Georgia, and perhaps Mexico ; it is known from all 

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

 Atlantic and the Eocky Mountains. 



DIOTYOPTEKYX. 



D. signata, sp. nov. 



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

 two irregular brown stripes, connected transversely before the eyes in a 

 manner to form an anterior large yellow spot, trilobate behind ; space 

 between the stripes with an anterior rounded spot, connected with a 

 smaller triangTilar one on the hind border ; a large yellow spot on each 

 side near the eyes. Antennae 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 some- 

 what dilated at the ends ; on each side three carved marks, formed by 

 rather irregular black polished scars ; lateral margin straight, dark. 

 Abdomen dark-brown above, pale-yellowish beneath; whitish around 

 the base of the feet ; segments darker at the base. Feet pale-brown, 

 femora with an external vitta and a ring before the knee ; Ijase of the 

 tibiae and tip of the tarsi dark-fuscous. Setae pale brown, darkest at 

 the tip of the joints. Wings with a grayish-yellow tinge, darker on the 

 costal margin ; veins brown, darker, and very irregular on the tip of the 

 wing, five or four, or even less, antecubitals ; wings of the male as long 

 as the abdomen, or one-third or more shorter ; the apical areolets very 

 irregular. 



Male. — The last dorsal segment yellow ; the apical margin recurvate, 

 transversely cariniform, thickened, emarginate in the middle, scabrous, 

 and rather villous exteriorly ; appendages yellow ; the superiors are 

 small recurved lobes; between them the larger inferiors, darker on the 

 triangular tip, which is sharp and a little emarginate beneath, just 

 before the tip; an ovoid membrane between the inferiors belongs per- 

 haps to the penis ; last ventral segment produced between the setae 

 with an elliptical margin. 



Female. — Last dorsal segment obtusely produced in the middle of the 

 apical margin, with a median longitudinal impression ; vulvar lamina 

 large, rather inflated on the antepenultimate segment, forming two free 

 circular lobes, very near together, beneath the penultimate segment. 



Length with the wings, ^, 13-17 millimeters; 9, 18-21 millimeters. 

 Alar expansion, $ , lG-26 millimeters ; $ , 30-40 millimeters. Length 

 of the setae, 11 millimeters. 



