THE LEAF BEETLES. 



1129 



2083 (6673). Pachybracii yk tbidens Melsh., Proc. Phil. Acid. Nat Sci 

 III, 1847, 172. 

 Short, subcyliiKlric.nl, less robust Head yellow; ver- 

 tex, and often a spot on front, black; color of thorax 

 given in key; elytra yellow, with a large, common, black 

 cruciform spot on disk, this wider at base, much nar- 

 rowed at middle, and again widened on apical third, so 

 as to form a common crossbar; each also with narrow 

 marginal line and humeral spot, black; under surface 

 black; antenna? and legs yellow, the hind thighs often 

 with black spot. Thorax sparsely and rather coarsely 

 punctured. Elytra with well defined though sinuous rows 

 of coarse punctures. Length 2-3 mm. (Fig. 487.) (Original. ) 



Throughout the State; common. May 25-August 2. Occurs on 

 foliage of hickory and elm and on that of many herbs along road- 

 sides. The color varies greatly. The yellow 1 is sometimes pale, 

 sometimes dirty brownish in hue; the dark spots vary from black to 

 dull brown. The median spot of thorax is sometimes Y-shaped, 

 again oblong, and rarely more or less merged with those on sides;' 

 while the elytra may be black with only a narrow median line of 

 yellow, or yellow with only the discal spot and three spots on sides 

 black. The sparsely punctured thorax and yellow legs will serve to 

 distinguish it from spumarhis and other closely allied forms. 



2084 (6660). Pachybrachys abdominalis Say. Journ. Phil. Acad. Nat. 



Sci., Ill, 1S24, 437; ibid. II, 263. 

 Form and size of the preceding. Head and thorax dull grayish-yellow, 

 irregularly clouded with markings formed by black punctures. Elytral in- 

 tervals grayish-white and prominent on the sides, the rows of punctures 

 black; the latter confused and intervals much broken on disk near suture; 

 under surface black ; sides of abdomen and pygidium marked with paler ; 

 legs pale, the femora with a dark spot on middle. Thorax rather coarsely 

 and irregularly punctate, the raised, smooth, gray or dull yellow spaces 

 varying much in size and shape. Length 2-3 mm. 



Northern third of State, frequent; not taken south of Marshall 

 and Kosciusko counties. May 12-June 30. Taken by sweeping 

 herbage in low, moist places. 



2085 (6690). Pachybrachys atomarius Melsh., Proc. Phil. Acad. Nat 



Sci., Ill, 1847, 170. 

 Subcylindrical, robust. Black, mottled with whitish ; front mostly white ■ 

 antennae fuscous, the three basal joints paler ; thorax black, with the nar- 

 row margins and three or four small, scattered spots, whitish ; elytra with 

 numerous elongate spaces of the broken intervals whitish ; under surface 

 black, the legs varied with white. Length 2.5-3 mm. 



Lake, Marshall and St. Joseph counties ; scarce, May 29- 

 June 11. 



