LUCY WRIGHT SMITH 
469 
Key to Species of Protarcys 
Adults 
a. With one pair of tracheal gills; the apical network of cross-veins rich 
and regular (fig. 59) dolobrata 
aa. With three pairs of tracheal gills, the apical network of cross-veins 
fairly rich and irregular (fig. 60) bradleyi 
Protarcys dolobrata new species 
Adult 
9 . — Length to tip of wings, 25 mm.; expanse of wings, 44 mm. 
Color, dull, dark brown. Head large, with three small ocelli arranged in an 
isosceles triangle, the distance between the posterior ocelli half again as great 
as that between them and the anterior ocellus, and about equal to the distance 
from them to the inner margin of the eye. Small, round, glossy tubercles 
much closer to the paired ocelli than to the inner margin of the eyes. M-shaped 
mark fairly distinct, brownish yellow. Crown-spot and region around the 
tubercles brownish yellow’; median occipital border with a pale yellow trian- 
gular spot, lateral occipital areas dull browui wdth coarse embossings. Under 
side of head brownish-yellow’, palpi of the same color, antennae broken off, 
except for basal segments which are brow’n. 
Prothorax, trapezoidal, slightly broader than the occiput, considerably 
narrowed posteriorly, sides straight, front margin a trifle arcuated, posterior 
border more noticeably convex, angles blunt. A small, pale yellow’, median 
spot on the anterior and posterior margins, a deep median furrow', lateral 
fields embossed, especially on the inner halves. Venter of thorax pale yellow 
with a dark brow'n, median, shield-shaped spot on each of the three segments. 
Legs dark brown wdth middle regions of femora and tibiae paler. Wings long 
and slender, w’ith yellow ish-brow’n venation; costa paler, veins smoky, a rather 
conspicuous brown spot on the radial cross-vein; apical half of the wings with 
a rich netw’ork of cross-veins extending from costa through cubitus 2 , cells 
fairly regular (fig. 59). On a line with the base of the legs on the anterior 
post-marginal area of the mesothorax a pair of rather short, fleshy gills. The 
same area on the metathorax is so badly mutilated that it is impossible to 
determine w’h ether a pair of gills was ever present or not. The part of the body 
anterior to the mesothorax is perfect and there is no trace of gills there. 
Female. Abdomen dull brown above and below’ with the exception of yel- 
lowish-brow’n median areas on the first seven sternites; sub-anal plates and 
first few basal segments of the setae pale yellow', the following segments pale 
yellow with narrow apical bands of brown. The vulvar lamina rather long and 
narrow' reaching across segment nine and the basal part of segment ten; semi- 
elliptical in form, apex truncate (fig. 39). 
Type specimen, a single female without a locality label, in the 
collection of the Academy of Natural Sciences of Philadelphia. 
Male unknown. 
Nymph unknown. 
TRANS. AM. ENT. SOC., XLIII. 
