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J^'cvialc. — " Sulphur-yellow; elytra commonly with an oblique black vitta, 

 then tips pellucid; vertex, thortix and scutel often fulvous or black" (Fitch). 

 Tergum black, the segments edged with yellow. 



Dr. Fitch notices six \arieties, as follows: 



Var. A. — Dull yellowish white throughout. 

 " B. — Bright sulphur-yellow throughout. 

 " C. — An oblique black stripe on each elytron. 

 " D. — Vertex, thorax and scutel tawny yellow. 

 " E. — Vertex and thora.x tawny yellow, scutel black. 

 " F. — Vertex, thorax and scutel black. 



To these I would add: 



Var. G. — Ferruginous brown, clavus pale yellow. 



The oblique black stripe mentioned in var. C follows the claval 

 suture, and may be present in any of the other varieties, and is 

 probably never absent in D, E, F and G, which thus show a regular 

 gradation in the extent of dark markings they exhibit. 



This species occurs on birch, but does not appear to be com- 

 mon, at least not around Buffalo. May to July, Lancaster, N. Y., 

 var. C, E, and F; Ridgeway, Ont., var. C, one pair in coitu re- 

 ceived from Mr. A. H. Kilman; Ottawa, Ont., one $ kindly given 

 me by Mr. W. H. Harrington, has the scutellar and commissural 

 margins of the clavus bright yellow; Quebec, L'Abbe Provancher 

 var. A, C and D (= Macropsis clitellarius Prov. ); Muskoka, Ont., 

 July, 1888, var. A, C and G; New Haven, Ct., one $ swept from 

 low bushes in a grove June 4, 1883. The pair kindly sent to me by 

 my friend, Mr. Kilman, was of special interest, as proving the iden- 

 tity of this species and abietis Fitch. 



2. Bythoscopus SObrius Walk. List Homop. Insects iii, p. 874, 1851. 



Testaceous yellow above, pale straw color beneath, elytra deep fulvous 

 brown, with a slight vinous tinge: vertex with an obsolete transverse yellow 

 vitta. Length 5 mm. 



Face rather convex, closely punctured; vertex with an impressed line 

 above the ocelli and an obscure central ridge; base of the front with a faint 

 yellowish line; cheeks, lorse, apex of the clypeus and all beneath pale straw 

 yellow. Pronotum large, sloping quite strongly toward the head; finely 

 transversely wrinkled and punctured, with a calloused area behind the eye. 

 Elytra fulvous brown, commissural nervure obscurely alternated with pale. 

 Wings very faintly smoky, nervures brown; ultimate ventral segment of the 

 9 longer than the penultimate, apical margin rounded, notch small. 



I am indebted to Mr. W. H. Harrington for a fine female ex- 

 ample labeled "Ottawa, July 8th." Another 9 taken by myself 

 at Lancaster, N. Y., May 31, 1887, differs from this only in being- 

 more cinereous in color; in the presence of a black dot above the 



