34 
antennae slightly infuscated at the tip. Pronotum short and rather stout, the an- 
terior and posterior halves of the deflected lohes nearly symmetrical; dorsum with, 
equal sides, quite distinctly tumid on the dorsum of the anterior lobe, the middle 
transverse sulcus nearly as close to the prosterior sulcus as to the short one in front 
of it. and the posterior lobe fully three-fourths the length of the anterior; posterior 
margin angularly rounded; median carina, like in the preceding species, marked in 
form like all the transverse sulci; dorsum mottled with dark brown, the lateral ca- 
nine marked with a more or less distinct narrow yellow stripe; the anterior margin 
of the deflected lobes clear yellow or pallid; prosternal spine straight, small, conical, 
bluntly pointed. Tegmina rather broad, ovate, overlapping, the tip scarely pro- 
duced, fully half as long as the abdomen, brownish fuscous, marked with yellow 
longitudinal veins, and flecked, principally along the median area, but also else- 
where, with longitudinal series of subquadrate blackish fuscous spots; wings a lit- 
tle shorter than the tegmina. Hind femora stout and full, yellow, the outer face 
marked with alternate, narrow, angulate, yellow and black stripes, often fainter in 
parts than in others, so as to show a tendency to transverse bands arranged as in 
P. jucundus; outer arc of genicular lobes broadly black ; hind tibia 3 yellow or green- 
ish blue, the apical half of the spines black ; arolium of either sex as in the preced- 
ing species (that is, either quadrate, rather narrow, longer than the claws ( $ ), or 
obpyriform. small, but little more than half as long as the claws ( 9 )• Abdomen 
yellow, the upper portion infuscated, the middle of the dorsum marked frequently 
with a series of approximate, subdorsal, roundish, black spots, often inclosing white 
spots nearly as large as themselves, those of opposite sides separated only by a slen- 
der yellow line; the abdomen of the two sexes has the peculiarities of the preced- 
ing species (Pez. jucundus), the last joint of the male being also entire; the anal 
cerci of the male scarcely differ from those of that species, the slender apex only 
l.eing a little less suddenly contracted. 
Length of body— male, 22.5 mm , female, 24.4 ,nm ; of antenna?— male, 9.25 mm , female, 
7.5 mm ; of pronotum — male, 6 mm , female, 6.9 nm ; of tegmina — male, 8.25 mm , female, 
10.75 mm ; of hind tibiae— male, 12.5 mm , female, 13. 5 mm . 
The habits of this locust are not vet very well known, since it has 
not been among the few species that have been made the theme for 
special study. In 1890, this insect was first seen by me in the central 
part of Idaho, about Shoshone and Boise City, where it occurred in 
large numbers along with Camnula pellucida, Dissosteira obliterate 
Melanophts fcedus and M. atlanis. In ratio of numbers the enigma came 
next to pellucida. It was found to be partial in its distribution to the 
lower bench lands in and near cultivated fields. What its egg-laying 
habits are I can not say. since the females had not yet begun deposit- 
ing, although many pairs of the insect were seen and taken in copula- 
tion about August 15. Judging from the structure of the terminal por- 
tion of the female abdomen, which is Aery blunt, I should suppose that 
rather loose, sandy, or loamy soil would be chosen for the purpose of 
deposition. Like most of the other destructive species, this locust al- 
ways appears at its best during warm, dry seasons. 
THE PELLUCID- WINGED LOCUST. 
{Camnula pellucida Scudd. ) 
While the majority of the destructive locusts belonging to Korth 
America are members of the subfamily Acridime, we are not entirely 
without those which are classified in the subfamily (Edipodinae. Of 
