IOWA ACADEMY OF SCIENCES. 187 



my sub. sp. vittata, each one of which answers the require- 

 ments of a different sub. sp. of Fitch; on the other hand I have 

 specimens which are unquestionably of different sub. sp. , and 

 occurring in widely separated localities which would be placed 

 in the same sub. sp., and the same variety by Fitch's classifi- 

 cation, clearly showing that the color of the pronotum is not of 

 sufficient value on which to base sub-species. He made no pro- 

 vision for the black varieties and from his remark about the 

 relationship of G atra, Germ. , it is highly probable that he had 

 none. 



A careful study of about seventy-five specimens, embracing 

 representatives from widely separated areas resulted in the 

 adoption of the color marking of the clavus as a character con- 

 stant for a given sub-species, and in the determination of 

 specific characters as follows: 



Size, medium; front strongly inflated, upper half black, lower half yel- 

 low; legs bright yellow, with lateral black lines. 



Front rising abruptly from face at sides continuing in same plane as 

 vertex above; upper half black; lower half, lorae and clypeus yellow, a 

 black dot on center of clypeus. Vertex slightlj^, transversely depressed, 

 anterior margin not distinctly carinated; suture between front and vertex 

 indistinct. Pronotum bare, broadly, indistinctly, transversely wrinkled, 

 wrinkles minutely striated, about twelve on the median line. Hemelytra 

 with a fine short pubescence; first discoid cell wider than second second 

 apical cell broad, nearly equal to third. Abdomen black or fuscous; legs 

 bright yellow; a lateral line on front of femur, one on each side of tibia; 

 all three joints of tarsi, and last segment of rostrum black. Length, four 

 mm. , width of pronotum about one and one-half mm. 



Habitat: Iowa, Illinois (Forbes), Quebec, Canada, Ontario, 

 Canada, New Hampshire, Massachusetts, Pennsylvania, New 

 York, District of Columbia, New Jersey (Smith), West Virginia. 



Sub. sp. I. Hava. Anterior two-thirds of clavus yellow. 

 Var. a. Scutellum with a yellow spot 

 b. Scutellum black. 

 Sub. sp. II. vittata. Clavus yellow with an oblique black vitta through 

 the middle. 

 Var. a. Pronotum with one yellow band anteriorly. 



b. Pronotum with two yellow bands. 



c. Pronotum entirely yellow. 



Habitat: New York, Pennsylvania, Massachusetts, Con- 

 necticut, District of Columbia. 



Sub. sp. III. nigra. Clavus entirely black. 



Var. a. A yellow band on vertex, and one on face next to vertex. 



b. Yellow bands wanting; entirely black above; legs darker. 



