176 IOWA ACADEMY OP SCIENCES. 



of a powdery white appearance. The head is large, broad and 

 deep, much inflited, almost round in front; eyes dark; wing 

 pads broad and short; the abdomen inclined to be carinate 

 dors illy. 



They are decidedly different from the larvas of any other 

 species of Tettigonia studied in the much shorter body, a fact 

 which would seem to indicate separation from the normal Tetti- 

 gonia forms, and which allies them to Euacanthus. 



While ordinarily considered a rather rare species this cer- 

 tainly occurs during a part of the year in its particular haunts in 

 great numbers — that is in the rather rank blue grass of timber 

 areas. In such locations it has been estimated to occur at the 

 rate of 50,000 per acre. 



DIEDROCEPHALA MOLLIPES SAY. 



Tettigonia mollipes Say. Jour Acad. Nat. Scl., Phila., IV, p. 312,1831. Oomp. writings 

 II, p. 386. Atdacizes mnlUpcs Fitch. Homop N. Y. State Oab., p. 56, 1831. Diedro- 

 cephala mollipes Walker. Homop. Suppl., p. 2S3, 1853. 



This species has been observed heretofore, and a record of 

 two broods a year indicated. Observations this year show a 

 somewhat later appearance of the spring brood, larva? occurring 

 through June and first week in July, adults appearing the last 

 week in June, continuing through July, and to about the 20th 

 of August. The second brood of larva? appeared about the 

 second week in August, running through Sep!:ember and matur- 

 ing in October and November. First adults of second brood 

 appeared about September 15th and continued through the sea- 

 son. Hibernation seems to occur in all stages, considerable 

 irregularity baing shown, but the main body being adapted to 

 the hibernation of eggs. 



The range of food plants is large, there seeming to be little 

 choice between annual or perennial grasses. It has been 

 recorded from. Adropogon scoparlus ?^udiprovinciaUs, Panlcum crus- 

 galli, scoparium; Setaria viridis and glauca. Wheat, oats, barley 

 (especially volunteer growth), slough grass {Spartina cynosur- 

 oides), wild rye, {Elymus canadensis). It occurs less commonly 

 on blue grass, probably in most cases only when other grasses 

 are present. 



As egg deposition in autumn is almost entirely confined to 

 large-stemmed grasses, the destruction of these in pastures is 

 advisable. 



