1948] 
Banks — Perlidce 
121 
curved than in flavescens , and, from side, is broader in 
the middle. The head has a little more pale in front than 
flavescens, venter pale, antennae pale for some distance. 
The prongs are long, the apical part very long and much 
curved down, and not scabrous above. 
Type M.C.Z. no. 245. 
Harrisiola americana Bks. 
This has the head black behind occipital line, pale each 
side between hind ocellus and boss, and pale over the V- 
mark. The genital prongs show a rather short apical 
part, and long basal part with erect hairs and numerous 
spicules above, the two parts separated by a strong con- 
striction. The hind femora are partly or wholly dark on 
upper edge, the lower edge pale ; setae mostly dark, but a 
few joints at base pale. 
Type M.C.Z. no 11324. 
Harrisiola klapaleki sp. nov. 
This is very similar to americana, but differs in the 
much shorter preapical part of the genital prongs. The 
hind femora have more black on basal part above ; but the 
lower margin is dark only near base. 
The female has the ninth segment below black each side, 
pale in middle, the subgenital plate less convex (not lobed 
as in americana) , and black or dark, except for the pale 
apical depression. 
From Loudonville, Ohio, 6 July (Osburn). 
Type M.C.Z. no 27717. 
Harrisiola modesta sp. nov. 
Head largely yellow, ocellar area black, and a broad 
dark band below the V-mark. The pronotum has a pale 
median streak, not reaching front and broader behind, an 
irregular pale spot on middle of meso- and metanotum. 
Tip of femora broadly black across; setae entirely black; 
last ventral segment (9) has a dark spot each side near 
outer margin; wings mostly blackish. 
Last section of genital prongs much shorter than in 
flavescens, about three times as long as broad (from side) 
