2 70 
Psyche 
[December 
be new, and in a surprising number of ways it is the most special- 
ized of all Boreus . In this account I describe Boreus notoperates 
n. sp., discuss its taxonomic relationships and specializations, offer 
reasons for disregarding Euboreus Lestage into which the new spe- 
cies would otherwise fall, and record the latitudinal dispersion of 
Boreus in the Holarctic. An account of the environment and discus- 
sion of host and habitat mosses, as well as other biological notes, will 
be the subjects of a second article. 
Description 
Boreus notoperates Cooper, n.sp. 
Diagnosis 
Boreu$ notoperates n. sp. (figs. 1-2) may be separated from all 
other Boreus now known by the following combination of characters: 
male and female dark, with light wings; antennae 19-segmented, 
frons foveolate, no median ocellus, occipital foramen not divided by 
a sclerotized corporatentorium, hypostomal bridge very long; prono- 
tum with 3 transverse folds; male: 2.7 mm long; forewing not 
spined on anterior margin; hindwing spined on posterior margin, 
without ventral brush; without tergal apophyses, 9th tergum with 
a glabrous, undivided, parallel-sided notch for styli ; hypandrium 
emarginate; internal, submedian tooth of style simple, acute; female: 
3.9 mm long; ovipositor short, cerci separated at tip, 10th tergum 
prolonged as a spined, upturned blade on each side of cerci; gona- 
pophyses strongly spined laterally and ventrally. 
Description 
Coloration. Eyes plum-colored to brownish black; head, nota, 
procoxae and abdomen shining black with a bronze or greenish glint. 
Rostrum on sides, apically, and below, dark reddish brown. Flanks 
of thorax, meso- and metacoxae piceous or black, yet appearing ashen 
due to fine pubescence. Antennae and palps nearly black. Legs yel- 
lowish-brown to piceous, tarsi darker apically. Modified wings light 
brownish-yellow (sooty brown in one male) to yellow, those of male 
piceous apically, of female piceous at basal attachment. Gonocoxites 
and styli black, tips of styli flavescent. Ovipositor black; cerci black, 
flavescent or pallid laterally near tips. 
Pubescence. Of male, gray, except bristles which are yellow to 
brown; moderately sparse on abdomen, as long or longer than basal 
width of metatarsus; denser and a third or less as long on thoracic 
pleura. Occiput glabrous, vertex and frons with sparse hairs as long 
as width of scape; on each side a triangular patch of fine silvery 
