NORTH AMKRIOAN COLEOPTERA. 81 



explauate, sutural angle distinct, but not prolonged : surface coarsely, deeply and 

 moderately closely punctate, somewhat finer toward apex. Body beneath finely 

 and not closely punctate, feebly pubescent. Length .18 — .22 inch.; 4.5 — 5.5 mm. 



Male. — Last ventral segment emarginate at tip, the disc with a deep triangular 

 depression limited by an elevated line; claws finely bifid at tip. 



Female. — Last ventral either entire, or with a very feeble emargination at 

 middle; claws stouter and more deeply bifid than in the male. 



Var. decora Say. — " Dusky, elytra dull testaceous, sericeous, with golden- 

 brassy hair." 



Ill this form the head may be partly piceous. The thoracic spots 

 distinct or not. The underside may be dull yellow or entirely pice- 

 ous. Legs pale. 



Var. — — -. — Brownish testaceous, varying as in the preceding form. 



This form seems to be labeled sagittariaB in most American collec- 

 tions, but the thorax in the latter is formed as in nyinphcece, and 

 many authors consider the two identical. G. salicis Rand, is prob- 

 ably the equivalent of this variety. Numerous specimens were 

 found by Dr. LeConte in the Adirondack region infesting the willows. 



Var. carbo Lee. — Entirely black, above and beneath. 

 Occurs in Canada, Massachusetts, New York, Wisconsin and Col- 

 orado in the paler forms, and in Nebraska, Washington and Oregon 

 in the black form. 



G. xanthomelsena Schrank, Enuni. Ins. Aust. 1781, p. 78; Fairm., Gen. 

 Col. Eur. iv, pi. 68, fig. 326 ; calmariensis Fab. Harris. Ins. Inj. Veg. ed. ji, p. 124 ; 

 gelatinarix Fab., Syst. El. i, p. 490; Oliv., Ent. vi, p. 631, pi. 3, fig. 36.— Oblong, 

 subdepressed, scarcely wider behind, yellowish testaceous, finely pubescent, a 

 black spot on the occiput, three on the thorax, a vitta from the humeral callus 

 and a short vitta from the middle of base of each elytron. Antennae piceous on 

 the upperside, paler beneath. Head yellow, with a black occipital spot; suiface 

 moderately coarsely not closely punctate. Thorax more than twice as wide as 

 long, slightly narrowed in front, sides arcuate, base slightly sinuate each side ; 

 disc with an oblique depression each side, a shallow fovea on the median line 

 behind the apex ; surface moderately, not closely punctate; elytra a little wider 

 behind the humeri, these distinct, but obtuse; margin explanate, sutural angle 

 well defined, not dentiform; surface moderately closely, not coarsely punctate, 

 the punctures equal from base to apex. Body beneath piceous, the sides and 

 apices of the ventral segments pale. Legs pale, each femur with a small piceous 

 spot in front. Length .20 — .28 inch. ; 5 — 7 mm. 



Male. — Last ventral emarginate, with a broad triangular depression ; claws 

 strong, deeply bifid. 



Female.^ Last ventral slightly emarginate, with a narrow triangular depression 

 simulating an incisure ; claws as in the male. 



This species seems to vary but little, and only by the absence of 

 the short stripe. 



TEANS. AM. ENT. SOC. XX. (11) MAY, 1893. 



