404 G. R. CROTCH, M. A. 



% anterior tarsi patellate, discs numerous, sub-equal, intermediate 

 tarsi broadly dilated, witb four rows of discs. 



H. Stagnalis, (Fab.) Mant. i., 191, 22. — Regularly ovate, piceous, head in 

 front, presternum and four anterior legs rufous : thorax rufous with a trans- 

 verse basal fascia (not reaching the sides) black; elytra with the margin 

 broadly fulvous (irrorated with black towards the apex), and a sub-basal fascia 

 from which go four or five longitudinal lines, also fulvous,- upper surface very 

 minutely closely punctulate, and also with a sparse more visible punctuation ; 

 the three dorsal series visible. L. *50 inch. 



Illinois. 



Var. a. — Elytra with the margin and fascia alone fulvous. 



Var. b. — Elytra with the margin only fulvous. 



Var. 9 . — Base of elytra aud thorax deeply reticulate strigose. 



The variety b resembles H, transversalis in coloring, but in that 

 species the basal margin of thorax is convex in front, in this it is 

 straight. 



H. piceus, Lee. New Spec, p. 33. — Closely allied to H. stagnalis, but rufo- 

 pieeous above, the sides of the thorax and margins of elytra gradually rufo-tes- 

 taceous. L. -50 inch. 



Pennsylvania, Illinois. 



H. bimarginatus. Say, Tr. Am. Phil, iv., 442: fulvicol lis, Aube", Spec. 

 vii., 184, 19; cinctipennis, Aube, Spec, vi., 191, 24 — Allied to H. stagnalis, but 

 smaller, more parallel, the minute punctuation rather more visible, the basal 

 band of the thorax much less developed, the elytra with a yellow humeral 

 vitta, sharply recurved at the base, not touching the margin, acuminate behind 

 the middle; the margin towards the apex rufous. L. -48 inch. 

 Pennsylvania, Georgia, Florida, Louisiana. 



SCUTOPTERUS, Esch. Dej. Cat., p. 61. (Type coriaceus.) 

 Thorax not margined, sides rounded in front, posterior angles pro- 

 duced acute, prosternuin pointed, metasternum grooved at base, broad, 

 lacinise triangular, episterna reaching the coxal plates; scutellum 

 nearly smooth, posterior femora ciliated at the apical angle. 



$ , four anterior tarsi patellate, clothed with small equal discs; the 

 fourth joint sub dilated, but without discs, claws simple, equal. 



S. aiigustus, (Lee.) Lake Super., p. 213 [Agabus], — Oblong, dilated be- 

 hind, black, upper surface finely reticulated, the areolae large and distinct; 

 the dorsal series of punctures are well marked at the base and obsolete before 

 the apex; body beneath sub-strigose, presternum sub-carinate, posterior 

 femora finely strigulose, tibiae coarsely punctate, spurs very unequal. L. *13 

 inch. 



Lake Superior, Kansas, Canada. 



