OSBORN AND BALL REVIEW N. A. SPECIES OF IDIOCERUS. I 27 



EE. Elytra iridescent, yellowish, the tip darker, espe- 

 cially in male, the outer fork of first sector curving 

 away to the costa without forming an anteapical 

 cell ; male antennal discs very small. (^z/^'i?? Prov. 

 DD. Size smaller, less than 5 mm., yellowish or greenish, the 

 elytra hyaline, showing the dark nervures of the wings. 

 nervatus V. D. 



Idiocerus maculipennis Fitch. (Plate III., Fig. 4.) 



Idiocerus maculipentiis Fitch. Homop. N. Y. State Cab., p. 59, 1851. 

 Bythoscopus )naculipennis Walk. Homop., IV., p. 1161, 1852. 

 Idiocerus maculipetmisV .Ti. Psyche, V. p. 388 ; Osborn, Proc. la. Acad. 

 Sci., I., pt. II., p. 126 (Iowa); Van Duzee, Trans. Am. Ent. Soc, XIX., p. 262. 



Chestnut brown with narrow light stripes on pronotum, scutellum, 

 and clavus. Length, ? 5.75 mm.; cJ*, 5.25 mm ; width, 1.7 mm. 



Face, in the female, chestnut with broad circles around the large 

 black spots on vertex, and small crescents under the ocelli light yel- 

 low ; in the male, yellow with a chestnut stripe down the middle and 

 a darker one each side from the corner of the eye down the genae out- 

 side the lorae. Pronotum chestnut with a pair of black spots on the 

 anterior margin, the posterior margin and three spots on the disc light 

 yellow, scutellum with the margins and tip light yellow. Elytra 

 brownish, the nervures darker, a narrow light stripe on the outer mar- 

 gin of clavus, and a hyaline band crossing the apex and broadening 

 towards the costa where it sharply interrupts the broad dark margin. 



Head scarcely wider than the short convex pronotum but very deep. 

 The outer anteapical cell short, triangular, the nervure then curving 

 away to the costa. Ultimate ventral segment of the female with the 

 posterior margin rounding, slightly emarginate in the middle ; male 

 valve with the posterior margin acutely triangular, the sides.concave. 



Found abundantly on hawthorn and crab apple, to which the chest- 

 nut brown color of both adult and larvae are well adapted. Specimens 

 are at hand from New York, Ontaria, and Iowa. 



Idiocerus provancheri V. D. 



Bythoscopus clite/lariiis Prov. Pet. Faune Ent. Can., III., p. 288, 1890. 

 Idiocerus provancheri V. L). Can. Ent., XXII., p. in, 1890; Osborn, 

 Proc. Iowa Acad. Sci., I., pt. II., p. 126, 1892. 



