136 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



has been taken for Quebec (Provancher), Ottawa (Harrington), Clear 

 Creek Canon and Denver (Uhler), Philadelphia (C. W. Johnson). 



An examination, by the senior author, of Walker's type of obsoletus 

 from ''Hudson Bay," led to the belief that it should be referred to 

 this species. 



Idiocerus duzei Prov. 



Idiocerus duzei-Vrov. Pet. Faune, Ent. Can., III., p. 292, 1890. 



Idiocerus perplexus G. & B. Hemip. Colo. 



Idiocerus pallidus var. Bak. Ent. News, Vol. VIII., p. 54. 



Slightly larger than pallidus, light yellowish green, the elytra golden 

 iridescent, tipped with fuscous. Length, $ 7 mm.; c?*, 6 mm.; width, 

 2 mm. 



Face and below pale greenish white, pronotum greenish, fading out 

 posteriorly ; scutellum yellowish, sometimes marked with brown, the 

 tip greenish. Elytra yellowish green at base, sub-hyaline with a golden 

 reflection beyond, becoming smoky at the tip in the female and 

 strongly fuscous in the male ; tergum yellowish, sometimes fuscous on 

 the disc. A still broader and stouter-appearing species than the pre- 

 ceding, with longer elytra, the outer branch of the first sector not 

 forming an anteapical cell, or rarely a short triangular one, the outer 

 nervure curving away to the costa. Ultimate ventral segment a little 

 longer than in pallidus, the outer angles rounding; pygofers 

 broader, the ovipositor exserted less than the length of the segment, 

 male antennal disc smaller, less than three times the width of the fila- 

 ment. 



The specimen from which Provancher described this species was 

 determined as new for America by Prof. Van Duzee, who also deter- 

 mined two other specimens of this species, one from New Hampshire 

 and one from Michigan. These specimens are somewhat darker than 

 most of the Iowa and Colorado ones, but they agree in all the struc- 

 tural details. 



Idiocerus perplexics G. & B. was stated to be only a variety oi pal- 

 lidus by Baker (Ent. News, Vol. VHI., No. 3, p. 54). An examina- 

 tion of the types, however, show it to be quite distinct from that spe- 

 cies but identical with the above. 



Found only on the cottonwood at Ames, Iowa. Specimens are at 

 hand from New Hampshire, Michigan and Colorado. Records from 

 Mr. Van Duzee are : Franconia, N. H. (Mrs. Slosson), Ag Coll. 

 Mich. (G. C. Davis), Quebec (Provancher). 



