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50 THE ACRIDIIDAE OF MINNESOTA 
pronotum together in the male, filiform, dark smoky brownish. Pro- 
notum broadly angulate at anterior margin and rectangulate or some- 
times obtusely angulate at posterior margin; its median carina not 
much elevated, distinctly cut by two sulci, in the female sometimes al- 
most obsolete between them; lateral canthi distinct though broken and 
somewhat irregular on the metazona. The whole disk is covered with 
heavy tubercules not coalescent save at the sulci and there variably 
so; a row of these black-tipped tubercules follows the anterior margin 
of the pronotum. On the anterior portion of the disk is a rather large 
dark spot, triangular in form, broadest behind, bounded by lighter, 
narrow bands giving a faintly defined X-mark. The lateral lobes of 
the pronotum are deeper than broad, concave by the constriction at the 
sulcus and bearing anteriorly below the middle an irregular dark spot. 
Fore and middle legs plumbeous, the middle femora with three ill- 
defined dark transverse bars. Measurements from specimens before 
us are as follows: male, length 27.5 mm., tegmina 25 to 28 mm., 
hind femora 15.5 to 16.5 mm., antennae 16 mm.; female, length 40 mm., 
tegmina 31 mm., hind femora 16 to 18 mm., antennae 12.5 mm. 
The following notes are from observations made during the past 
two years in Ottertail County: May 15,1911. Noted many specimens 
of this species, adult males and females and the immature forms or 
nymphs. The males in particular are quite active, although not easily 
aroused. They frequently crouch amid the sparse vegetation and rely 
upon concealment. To-day the males were far more numerous or the 
females unusually well concealed, as I saw but few of them, while the 
males were quite plenty. 
The male is very active and alert, flying with a sharp, crackling, 
aerial stridulation, and near the end of the flight invariably makes an 
abrupt turn or zigzag and immediately upon alighting runs rapidly a 
few inches from the spot. In bright weather they are extremely wary 
and difficult to capture; even when in the net they frequently crouch 
close to the ground, perfectly motionless, and their coloration, despite 
its striking colors, blends so perfectly with the lights and shadows 
among the dead vegetation as to render them almost invisible. They 
are as quick to seize an opportunity and escape, when the net is moved 
incautiously in searching for them, as some of the Cicindelidae. The 
females, although large and bulky, can fly well when alarmed. We 
noted one arise and fly a distance of eighty feet or more at a height 
of about ten feet, crossing a small hillock and alighting on the oppo- 
site side, where we were unable to locate her again. 
June 6. While driving with Mr. Metzger, we noted from the road- 
side a dense growth of Artemisia cana on a high dry hillside and, re- 
calling the close association of this plant with H. zapotecus, I made 
