ARCHILESTES 269 
The nymphs clamber among submerged vegetation in still waters. 
They have broad, oblong, blunt-pointed gills that show indistinct 
segmentation along their axis, and 2 bands of obscure, darker color, 
one before the middle and one broadly covering the tips. 
Nymphs 
Length of Ment. 
Species Length gills Lat. Set. Set. Described by 
grandis 40 12 3 or 4 (fant Ndm. ’92, p. 712 
californica 30 10 3 6-7 Kndy. ’15, p. 268 

257. Archilestes grandis Rambur 
Ramb. ’42, p. 244: Mtk. Cat. p. 36. 
Length 62 mm. Expanse 82 mm. Wash. and Calif. 
This is a fine, brownish species with yellow side stripes upon the thorax. Face 
and occiput shining brown. Top of head with scanty, hoary pubescence. Front 
of thorax black with a median, rather narrow pale stripe narrowly divided by 
the black of the carina. Another broader pale brown stripe covers the humeral 
suture. Sides black with two broad, yellow pale stripes, one behind the middle 
suture and one at the rear below. Wings hyaline or faintly tinged with brownish 
with very long stigma. Legs blackish, yellow externally and paler at base. Ab- 
domen greenish black narrowly and obscurely ringed with paler at base of seg- 
ments 2-7 and paler on sides below. Apex blackish, 9 and 10 becoming pruinose 
in age. Appendages black. 
258. Archilestes californica McLachlan 
McL. ’95, p. 20: Mtk. Cat. p. 35: Kndy. ’15, p. 260: Smn. ’27, p. 9. 
Length 48 mm. Expanse 62 mm. Calif. 
This species seems not to differ in any constant structural characters from 
the preceding. The only differences noted by us are those stated in the key. 
This species was carefully studied by Kennedy in Oregon. He says 
of. 16: (15, p..266): 
Females that possess an ovipositor insert their eggs generally in soft plant 
tissues, such as green herbaceous stems or rotten wood. The genus Archilestes, 
however, uses the stems of woody plants, such as willows and alders, and places 
her eggs high above the water. 
During August, or until active breeding began, the individuals of this species 
with wings held loosely open were usually found hanging on the leaves and stems 
on the sunny side of willow and alder bushes. Here each appeared to have its 
favorite position, from which it would fly up and out a distance of 6 to 10 feet 
from time to time to take passing insects, returning each time to its resting place. 
On being disturbed none ever hesitated to dart into the densest portion of the 
