Palearctic Nemowre. 561 
stress on the form of the pronotum, and this appears to 
be justified to some extent ; but care must also be taken 
here, as shrinkage in drying is unequal, varying with the 
degrees of maturity of the individuals. Amongst living 
examples of the same species of one of the larger Perlidzx, L 
believe that I have noticed a difference between the form 
of the pronotal plate in examples just disclosed and 
those in which the chitin had set hard. While the rugose 
condition of the surface of this segment and the arrange- 
ment of the tubercles may be useful for specific deter- 
mination, I have not yet been able to come to satisfactory 
conclusions on the point. 
In the following descriptions, when reference is made 
to the wings, the anterior pair is alluded to, unless 
otherwise stated. 
Nemowra variegata. 
N. variegata, Olivier, Encye. Méth., vili., p. 186, 
No. 3 (1811) ? 
N. variegata, Pictet, Perlides, p. 386, pl. 1. (L@41). 
N. nebulosa, fuliginosa, pallida, cruciata, affinis, annu- 
lata, luteicornis, pusilla, Stephens, Lllustrations, 
p-. 140 and 141 (1836). 
N. lunata, Rambur, Névropteéres, p. 461 (1842). 
N. uwmbrosa, Kd. Pictet, Névropt. d’Hspagne, p. 20 
(1€65), in part according to types. 
Head and pronotum yellowish-brown, the latter with darker 
clouds. Antenne usually brownish, with paler basal joint. Pro- 
notum very slightly broader than the head without the eyes, with 
a broad, well-defined border, whose margins are gently rounded 
both in front and laterally ; this segment is minutely granulose 
with two vague transverse depressions (or three, counting the one 
behind the anterior border). Meso- and meta-nota dark brown or 
nearly black, the scutella of these segments and the parts adjoining 
sometimes paler. Abdomen brown or blackish, Legs varying from 
brown to yellowish, femora rather darker about the apex, tibiz 
with a dark apical annulation, and tarsi, especially the distal joints, 
fuscous. Wings ranging from nearly hyaline to brownish-grey, 
with blackish or fuscous neuration, often with fuscous markings in 
the region of the pterostigma and x nervures, the pigment in 
strongly-marked examples spreading out on either side of the 
nervure forming the base of the 3rd apical cellule into a fuscous 
triangle, . In ibis species the end of the radius is almost invariably 
