198 [October 
Seta % 24 to about 35 mill. 9 deficient. Ant. leg % 9 mill. 9 (same 
size) 7^ mill. Two S , one 9 . 
The 9 subimago has the coloring of the abdominal dorsum dull and 
opaque, and the yellowish vittae obliterated, but the shape of the dark 
vitta still remains discernable. The wings are dull opaque yellowish.— 
Length % 19 mill. 9 18—20 mill. Exp. % 33 mill. 9 38—40 mill. 
Seta 'S 18 mill. 9 13 mill. Interm, seta % 4J mill. 9 10 J mill. One % 
from which I bred an imago; two 9 •—The only specimen I formerly 
had of this species was a % , found entangled in a cobweb. In disen¬ 
gaging the insect the setae got broken in pieces, except about ^ of their 
length, but I guessed them at “about 40 or 50 mill.” The additional % 
I now possess was bred from a subimago, the setae of which measured 
18 mill., and those of the subimaginal integument 19 mill. This % 
died before its setae became fully developed, but they measure now 
about 24 mill. As the setae of the % imago in the allied F. hilineata 
and P. Ihnhata are much more than double those of the % subimago, 
we may safely estimate the seta of % vitfigera, imago, at about 30 or 35 
mill., when fully developed, those of the subimago being 18 or 19 
mill. The seta of the female imago of the next species measures 221 
mill , and that of the 9 subiniago 17 mill.; but it is a very general 
rule in Ephemerina that the S setas and % front leg are proportionally 
much more elongated than the 9 setae and 9 front leg, on assuming 
the imago state. 
P. quadripunctata n. sp. 
The imago 9 differs from the preceding species (P. vittigera, Walsh) 
only as follows:—-Is/;. There are four distinct fuscous dots, each sur¬ 
rounded by a slight cloud and conspicuous to the naked eye, on the 
front wings, extending in a slightly curved line from the middle 
of the costa to the centre of the disk; viz., one on the 2d vein 
of the costa, and one on the 4th, 6th and 9th veins respectively from 
the costal edge. In vittigera^ imago and subimago, no traces whatever 
can be discovered of any such dots. 2nd. The piceous vitta of each 
abdominal segment, instead of having its sides nearly straight, has 
them sharply angulated, so that the vitta of each segment forms a regu¬ 
lar hexagon.—The small yellowish vittm included in the piceous vitta 
are here subobsolete, but are very distinct in the S subimago.— 
Length 9 19^ mill. Exp. 9 40 mill. Seta 9 22^ mill. Interni. seta 9 
19^ mill. One 9 ; S unknown. 
