322 bulletin: museum of comparative zoology, 



others less so. Ocelli small, more than five diameters from each other, and 

 about as far from eyes; lateral bosses about the size of the oceUi, rounded, 

 half way from ocelli to eyes; pronotum one and one fourth times l)roader than 

 long, anterior angles sharp, posterior rounded, plainly broader in front than^ 

 behind; ventral plate long, with a small median sinus. 

 Length of body 10 mm., fore wing 13 mm. 



Neoperla camposi, sp.^.nov. 



Type.— M. C. Z. 10,829. Ecuador: Pifo (F. Campos R.). 



Yellowish brown. Similar in many ways to A^. longicauda and A^. bolivari, 

 wings faintly tinted with brown, venation mostly brown, as in those species, 

 but the radial sector is pale as far out as the anastomosis, beyond wWch it is 

 dark. Palpi and antennae dark; the head barely marked with brown in 

 front; the sides of pronotum broadly brown; the meso- and metanotum 

 brownish, with a pale median stripe through to the abdomen, which is yellowish 

 at base, darker at tip ; cerci brownish, paler toward tip ; legs pale, femur with 

 black near tip above, tibia pale, unmarked. Ocelli scarcely diameter apart, 

 more than two diameters from the eyes, lateral bosses large, oblique, hardly 

 more than one half an ocellus diameter from either eye or ocelli. The wing 

 shows twelve costal cross- veins and three others beyond end of the subcosta; 

 six to eight median and cubital cross- veins; radial sector three- or fom-branched 

 beyond anastomosis, anastomosis scarcely disjointed, the upper part oblique. 

 Last segment of male shows a slight elliptical tubercle near tip. 



Length of body 15 mm., of fore wing 24 mm. 



Isoperla mormona, sp. nov. 



Type.— M. C. Z. 10,822. Utah : Vineyard, 22 June (Tom Spalding) . 



Yellowish green; head slightly darker in the middle; pronotum hardly 

 darker on sides; antennae and palpi pale brownish; abdomen setae and legs 

 yellowish, tarsi darker. Wings yellowish green, with brownish venation; 

 radial sector l)ut once forked and one cross- vein beyond end of subcosta; about 

 five median and cubital cross- veins. Head but little broader than pronotum; 

 ocelli in nearly equilateral triangle, posterior ocelli about one fourth nearer to 

 eyes than to each other; lateral bosses small, rather nearer to the antennal 

 ridges than to the posterior ocelli; pronotum one and one half broader than 

 long, sides parallel; ventral plate of the female barely produced. 



Expanse 18 mm. 



Isoperla isolata, sp. nov. 



T^^pe.— M. Q. Z. 10,824. N. C: Hot Springs (Mrs. A. T. Slos- 

 son); Black Mts., May, 



