AQUATIC INSECTS IN NEW YORK STATE 215 
Callibaetis skokiana n. sp. 
Plate 7 
Imago. Length of body 9-10mm; expanse of wings 18-20mm; 
length of setae, male 20mm, female 16mm. Ground color pale 
flesh tint, tinged with yellow (more yellowish in the female) 
marked, mottled and dotted with brown; antennae, legs and 
setae white. 
Head pale brownish, with whitish margins; in the male, 
‘occupied superiorly by the large turbinate superior portion of 
the compound eyes, which are pale egg-yellow on their superior, 
faceted surface, with paler margins, and which areas large as 
all the remainder of the head; in the female the top of the head 
is very flat, and is traversed by two longitudinal, irregular, pale 
brown bands, which are surrounded and separated by whitish. 
Prothorax paler, thickly dotted with brownish color. Dorsum 
of the mesothorax with a pale, longitudinal median suture, each 
Big, 1° Wings of Callibaetis skokiana,- male 
side of which is a band of brown rounded off posteriorly, and at 
the sides there are brown spots inferiorly. The median narrow | 
pale line is continued posteriorly to the abdomen, and there are 
brown spots on the sides of the metanotum. Sides of thorax 
irregularly speckled with brown. Legs white with darker mark- 
ings at the knees and at the ends of the tarsal segments, the 
last one of which is wholly washed with brown. Wings with 
the usual costal band, differing in the sexes, behind which they 
are hyaline. The band in the female is darker and better de- 
veloped. It covers proximally the bases of all the veins and is 
regularly narrowed to the apex, ending just before the apex of 
the wing, not lobed posteriorly, fenestrate with hyaline on most 
of the cross veins except toward the base, and reduced to a yel- 
lowish wash in the stigmatic region and about the humeral 
cross vein. In the male the costal fascia is paler, and usually 
disappears just before the yellowish stigmatic space, which is 
‘sometimes filled with anastomosing cross veins. The venation 
f the male is shown in figure 1. There is much variability in the 
