[OWA ACADEMY OP SCIENCES. 
191 
becomiDg marked again upon the posterior margin, enlarged and 
lobate on the thorax, then narrow with definite parallel margins 
to the last segment of the abdomen, where they expand and 
meet at the tip. Besides these there is a broad stripe extend- 
ing from the inner angle of the eye back across the thorax, 
where it is margined internally with light to the abdomen, where 
it margins all but the last segment. 
They require about a month to develop, maturing during the 
latter part of July and the first of August, the adults remaining 
until the middle of September. 
The eggs for the second brood are deposited from the middle 
to the last of August and the larvae appear in September, becom- 
ing full grown before winter, when they hibernate, appearing 
to pupate about the first of May and becoming adults before 
the middle of this month. 
Stipa is another troublesome grass, but too widely and evenly 
distributed over the prairies to eradicate easily. It may, how- 
ever, be mowed closely between the 10th and 16th of June to 
destroy the first brood of eggs and the troublesome barbs of 
the grass at the same time, leaving an undergrowth of nutritious 
grass free from jassids. Then, should the adults appear in 
considerable numbers in August, a second mowing during the 
latter part would effectually dispose of the second brood of eggs. 
Stipa is a very valuable grass to the stockmen of the prairie 
regions, where blue grass has not been introduced, as it appears 
two or three weeks earlier than the other wild upland grasses, 
thus furnishing much earlier grazing than could otherwise be 
obtained. 
PLATYMETOPIUS, BURM. 
The American representatives of this genus agree with the 
European P. vittatus^ Fab. , in form and the generic characters 
may be stated for our species as follows: 
Head distinctly narrower than the pronotum; vertex narrow, 
produced and very acutely angled, making an acute angle with 
the face. Face long, narrow, front long, broadest at the ocelli, 
narrowing above to the tip of the vertex, below to the antennal 
pit, from them to near its apex nearly parallel margined, nar- 
rowing slightly to the cl y pens; clypeus strongly constricted 
before the middle, widening to the broad apex; lorse subovate; 
pronotum short, strongly produced beneath the eyes, lateral 
margin long. Elytra with more or less of fine irrorations in 
the areoles and small hyaline white points near the ends of the 
