NEUROPTEEA PERLINA DICTYOPTERYX SIGN ATA. 915 



and very irregular on the tip of the wing, five or four, or even fewer ante- 

 cubitals ; wings of the male as long as the abdomen, or one third or more 

 shorter ; the apical ariolets 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, perhaps, 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, c? , 16-26 millimeters ; 9 , 30-40 millimeters. Length of the 

 setse, 1 1 millimeters. 



HAB. Foothills, Colorado, September, and mountains on the Pacific 

 slope, August 16 to September 6. 



This genus is new for the American fauna ; all species known belong 

 to Europe and Siberia. This new species is far more interesting as an 

 exception, bearing gills in the imago state. There are on the ventral side 

 five pairs of gills, formed by white, fleshy, blind sacs, two pairs on the 

 under side of the head ; the first pair widely separated on the basal part of 

 the submentum ; the second pair in the articulation with the prothorax ; 

 both pairs straight, placed transversely, looking outward. The three other 

 pairs on the thorax always before the feet, but separated from them, being 

 placed just in the articulation of the segments ; the three thoracic pairs are 

 incurved. 



The occurrence of gills in the imago state of D. signata is the more 

 exceptional, as all the hitherto known species are without them ; at least, a 

 close examination of dry specimens of all the species in my collection (only 

 one of Siberia is unknown to me) did not disclose anything similar to the 

 gills in D. signata. Dr. Gerstaecker, in a recently published paper, also 



