[OWA ACADEMY OF SCIENCES. 191 



becoming 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 larvse 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 mowitg 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 apax nearly parallel margined, nar- 

 rowing slightly to the clypeus; clypeus strongly constricted 

 before the middle, widening to the broad apex; lora3 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 



