1949] 
Cheng — Mecoptera 
141 
cated by light brown color; the distal hind margin of 
wings slightly emarginated. Hind wing: length, 12.5 
mm. ; width, 3.5 mm. ; similar to fore wings. <? genitalia : 
genital bulb less rounded ; coxopodites long, broadened to- 
wards its apex ; harpagones short, the outer margin very 
slightly concave at the middle the inner margin with a 
median small triangular tooth and a large basal concave 
area; hypandrium inconspicuous; hypovalvse long, with 
slightly concave median outer margins, extending nearly 
to the base of the harpagones; parameres simple and 
long, usually reaching to the distal part of harpagones, 
each consisting of a single stalk, which broadens at the 
middle, and each very long and sharp distally, hearing a 
series of long barhs at its distal inner margin; preepi- 
proct narrow towards the apex, with nearly straight 
sides and a narrow U-shaped distal incision; sedeagus 
with very long apical processes and well prolonged lat- 
eral processes, the distal inner margin of the former usu- 
ally jointed with a broad triangular plate. '? genitalia : 
subgenital plate elongated, emarginated posteriorly, the 
incision being very small; internal skeleton large, the 
plate concave at its median sides with a pair of sharp 
distal posterior arms and two pairs of small basal side 
plates, the axis straight, extending beyond the plate 
nearly one-fourth its length. 
Holotype (t?) : Mt. Hwa, Shensi ; June, 1942 ; Io Chou ; 
in the Museum of Comparative Zoology. Allotype (?) : 
Same collecting data as holotype; in my own collection. 
Paratypes : 3 4 ?, same collecting data as holotype; in 
National Northwest College of Agriculture, Wukung, 
Shensi. 
This species, possessing a single anal horn, belongs to 
the centralis-g roup, with the wing membrane transparent 
as in centralis Tjeder. The wing apex of centralis Tjeder 
is colorless, whereas that of emarginata is maculated with 
a slight suspicion of gray. The male genitalia differ from 
those of centralis Tjeder by the less rounded genital bulb 
and the longer and sharper parameres. 
