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4- (5) I-'^^t ventral se<>;nieiit short, with a broad shallow notch. 8. nigrinasi. 



5. (4) a. Last ventral se.a:nient long, rounded, with a deep notch; rf black, 



9 sulphur-yellow, commonly marked with black, i. variabilis. 



b. Last ventral moderately long, subtriangular with a shallow notch, 



color fulvous brown 2. sobrius. 



6. (3) Last ventral segment produced in a more or less distinct tooth each 



side of the apical notch. 



7. (8) Last ventral segment cylindrical, notch widened, almost obsolete, the 



short teeth when present incurved, disc with a broad, shallow 

 depression; gray, elytra subhyaline, maculated on the suture. 



4. cognatus. 



8. (7) Last ventral segment more or less distinctly triangular, with the ai)ical 



teeth usually distinct. 



9. (12) Elytra clouded, fenestrate with subhyaline $. 



10. (i i) Pale fulvous, or cinereous-fulvous; last ventral segment shorter, teeth 



small 7- minor. 



11. (lo) Cinereous, or fulvous-brown, last ventral segment longer, teeth large. 



5. fenestratus. 



12. (9) Elytra hyaline, nervnres brown, a discal spot, and commonly the apex, 



clouded; verte.x piceous, with a yellow band connecting the ocelli. 



6. pruni. 



I. Bythoscopus variabilis Fitch. 



9 Athysanus do.. Fitch, Homop. N. Y. State Cab. p. 60, 1851; Trans. N. 



Y. State Agric. Soc. xviii, p. 853, 1858; Rathvon, Mombert Hist. 



Lancaster County, Pa., p. 551; Packard, U. S. Ent. Com. Bulletin 



No. 7, p. 128 (after Fitch); Smith List of Ins. of N. J. p. 446, 1890. 



Bythoscopus do.. Walk., List of Homop. iii, p. 876; Provancher, Petit 



Faun. Ent. du Can. p. 289, 1889 (erroneously written variegatus). 

 Pediopsis do.. Van Dnzee, List Muskoka Hemip. Can. Ent. xxi, p. 9, 18S9. 

 Macropsis clitellariiis Provancher, Nat. Can. iv, p. 877, 1872 (= var. D). 

 ^ Athysanus abtetis Fitch, Homop. N. Y. State Cab. p. 60, 1851; Trans. 

 N. Y. State Agric. Soc. xvii,,p. 748, 1857, and xviii, p.- 854, 1858, 

 Rathvon, Mombert Hist. Lancaster County, Pa., p. 551; Packard, 

 U. S. Ent. Com. lUiUetin, No. 7, pp. 129-235. 

 Bythoscopus do.. Walk., List of Homop. iv, p. 1162. 

 Head closely punctured. \'ertex short, with a longitudinal central ridge; 

 front more convex in the female than in the male, pronotum with fine, trans- 

 verse ruga?; anterior disc of the scutellum minutely punctured, apical field 

 transversely striate; ultimate ventral segment of the 9 long, produced pos- 

 teriorly with a deep central notch. Length 5 mm. 



Color: Male. — Piceous black; head yellow, apex of the front, a band on 

 its base and another on the base of the vertex black, the two latter frequently 

 confluent at their ends; hind edge of the pronotum and a band on the ante- 

 rior submargin which may be extended over most of the disc as a suffused 

 cloud, yellow. Legs yellow, outer face of the posterior and sometimes the 

 anterior and intermediate tibia; blackish. Commissural nervure with a yellow 

 spot; scutellum in pale examples with two diverging lines and the tip yellow. 

 Beneath yellow, sometimes \aried with black. 



