Fig. 1. 
NEU ROPTERA.—EPHEMERID. 
PLATE I. 
Lachlania lucida, adult 9: la, wing of another specimen, with the intermediate cross- 
velnlet out of position. 
. Homeoneuria salvinie, adult 9°. 
Euthyplocia hecuba, adult 9: 3a, end of @ abdomen with sete cut short, showing in 
lateral profile the extruded ovisac and a peculiar chitinous bristle, seemingly arising 
from the middle of the apical ventral margin of the seventh segment, associated with 
the sac. 
. Hexagenia mexicana, adult ¢. 
. Choroterpes inornata, details of adult: 5, 5 a—-c, parts of fore wings, showing variations 
in the neuration of the anal-axillar areas; 5d, hind wing; 5e, partial view of ¢ 
genitalia. 
. Choroterpes nervosa, details of adult ?: 6, part of fore wing, showing numerous cross- 
veinlets and the neuration of the anal-axillar areas; 6a, hind wing. 
. Thraulus primanus, details of adult: 7, hind wing of ?; 7a, ditto of ¢. 
. Tricorythus explicatus, details of adult: 8, wing of adult, the stippled line showing the 
extent of the fringe ; 8 a, forceps of @. 
. Lepiohyphes brevissimus, detail of adult: wing of 9° , the stippled line showing the extent 
of the fringe. 
