PLECOPTERA OF NORTH AMERICA 89 



Mex., July 29 (T. D. A. Cockerell) ; Reno, Nev., 1878 

 (Morrison) . 



Perla verticalis Banks. 



((Plate 14, fig. 8; plate 18, figs. 13, 14, 15.) 



1920. Perla verticalis Banks, Bull. Mus. Comp. Zool., 64:318. 

 1920. Isoperla isolata Banks, Bull. Mus. Comp. Zool., 64:322. 



Length to wing tips, male, 13-14 mm. ; female, 14-16 

 mm. Expanse, male, 22-25 mm. ; female, 24-30 mm. 



Color dull brown varied with yellow. Head yellowish. 

 Head brownish with a large triradiate yellow spot upon 

 the occiput ; the three rays extending forward between 

 and beside the rear ocelli. Pale also before the middle 

 ocellus. Hind angles broadly black. Antennae and palpi 

 pale brown. 



Prothorax quadrangular with rounded angles and con- 

 vex front and rear margins, the latter a little refuse in 

 the middle. Middorsal yellow stripe rather narrow. Sides 

 of disc brown faintly embossed with numerous obscure 

 vermiculate embossed markings. Legs pale brown. 

 Wings subhyaline with pale brown veins. 



Abdomen brown, paler about the genitalia. Tails 

 brown, rather hairy at base. 



Male. Abdominal segments normal to the 7th which 

 has a low midventral apical lobe set off at the sides by 

 widely rounded emarginations. Segment 8 normal : 9 a 

 little extended and upturned below, 10 cleft above with 

 the lobes beside the cleft subtriangular, rounded on tip. 

 Supra-anal process with long lateral stylets. Basal at- 

 tachment plate of two crescentric lobes conjoined end to 

 end like the halves of a figure 3. 



Female. Subgenital plate yellowish, elongate rounded 

 triangular, obtuse at the apex which extends well across 

 the 10th sternite. 



Distribution. — Franconia, N. H. (Mrs. A. T. Slosson) ; 

 Elkhart, Ind., June (R. J. Weith) ; Sunburst, N. C, May 2, 

 1912 (C. S. Brimley). 



This may possibly prove to be P. picta Pict. 



Perla tincta, new species. 



(Plate 14, fig. 3; plate 17, fig. 15.) 



Length to wing tips, female, 18 mm. ; expanse, 32 mm. 



Color black varied with tawny yellow and with smoky 

 wings. Head black with a yellow occipital triangle whose 

 apex just reaches the level of the hind ocelli. M-mark 

 across the front black, shining, with minute extra angula- 

 tions. Frontal tubercles crescentic transverse, promi- 



