[Sept. 
124 Psyche 
head, which is a little shorter, and in details of the ventral 
plate. 
Type M.C.Z. no. 27722. 
Neoperla clymene subsp. mainensis nov. 
This form differs radically from the common form in 
the blackened body and wings ; head and thorax deep black, 
sometimes a little rufous each side of anterior ocellus ; an- 
tennae mostly black, a few joints beyond second paler. 
Wings with black veins and the membrane infnscate, even 
the costal border of fore wing is black at base and beyond 
scarcely yellowish, only not as dark as rest of wing ; abdo- 
men black above and below, extreme tip above in genital 
area paler; femora dark brown to black, the lower edge 
paler ; setae pale, with dark at tips of joints, and farther 
out wholly black. 
The ocelli are a little more separated than is usual in 
N. clymene. The genital prongs, instead of slightly 
evenly curved, are bent so that the apical part is parallel 
to its fellow; the slender conical process on the seventh 
dorsal segment is longer than in typical clymene, and ex- 
tends over most of the next segment. 
Type M.C.Z. no. 27725. 
Mr. A. Loveridge has taken numerous specimens of this 
black form at Rome, Maine, 26 June to 8 July. 
Peltoperla nigrisoma sp. nov. 
Body above and below jet black, except a pale yellowish 
triangular spot over anterior corners of face from eye 
Explanation of Plate 11 
Fig. 1. Perlesta decipiens, male genital prongs, and one from side. 
Fig. 2. Perlesta placida, male genital prongs, and one from side. 
Fig. 3. Perlesta frisoni, female anal plates, and ocellus and boss. 
Fig. 4. Perlesta frisoni , male genital prongs. 
Fig. 5. Perlesta texana, tip of abdomen, ocelli, and hind tibia. 
Fig. 6. Perlesta cinctipes, tip of abdomen, seta, hind femur and tibia. 
Fig. 7. Perlesta brunneipennis, male genital prongs, and hind tibia. 
Fig. 8. Perlesta texana, male genital prongs. 
Fig. 9. Perlesta cinctipes, male genital prongs. 
Fig. 10. Perlesta placida, tip of female abdomen from below. 
Fig. 11. Perlesta frisoni, subgenital plate of female, and ocellus and boss. 
Fig. 12. Perlesta nitida, subgenital plate. 
