1913] Banks — Neuropteroid In seels from Brazil 85 



Differs from S. traili Eaton in not having the cubitus forked, and unmarked wing. 

 Expanse 16 nun. 



From Camp 41, Rio Madeira River, Brazil (Mann.) 



Tricorythus australis sp. now 



Pale yellowish, thoracic notum brown, vertex with a black crescent-shaped mark 

 each side near the eye; pronotum and pleura with some faint blackish spots and 

 sometimes two submedian dark streaks on the mesonotum; abdominal segments 

 blackish on the sides, sometimes all across on the hind margin, the last few segments 

 more broadly marked than the others; legs long and slender, wholly pale; wings 

 moderately broad, subhyaline, subcosta and radius darkened, but few cross-veins 

 and these mostly before the middle of the wing. Seta? three, the laterals rather 

 larger than the median, especially in male. Expanse 8 mm. 



From Camp 41, Rio Madeira, Brazil (Mann.) 



Bcetis oldendorffi, YVeyenbergh. 



Three specimens agree with the figure of the fore wing given 

 by Weyenbergh, but that author evidently overlooked the hind 

 wings which are very slender and inconspicuous. 



From Camp 41, Rio Madeira River, Brazil (Mann coll.). 



Perlid.e. 



Neoperla debilis Pictet. 



One from Madeira Mamore River, Matto Grosso, Brazil (Mann) . 

 Described from Brazil. 



Neoperla posticata sp. now 



Head yellow, with black mark extending forward from between the ocelli, and 

 then bending at right angles to the eyes; antennae dark; pronotum dark brown, with 

 a broad pale median stripe, widened in front; thorax and abdomen pale yellow; 

 setae dark brown except the basal joint which is yellow; legs blackish, but basal 

 half of fore and middle femora, basal two-thirds of hind femora, and a broad band 

 beyond middle on hind tibia?, bright yellowish; wings a uniform brown, except the 

 yellowish costal margin. Ocelli about two diameters apart and but little farther 

 from the eyes, Literal bosx-s close to the ocelli, and about their diameter from the 

 eyes; pronotum much broader than long, slightly narrowed behind, sides strongly 

 rugose; hind tibia longer than hind femur, very broad. Fore wings with two 

 branches to the radial sector; three median and three cubital cross-veins, alternat- 



