THE LEAF BEETLES. 1129 



20s:j (mi:',). Pachybkachys tmuens Melsli., I'l-uc. riiil. Acad. Nut Sci., 

 Ill, 1847, 172. 

 .Short, subcylindrical, less robust. Head .yellow; ver- 

 te-\. imd often a spot on front, . black ; color of thorax 

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

 erncifonn spot on disk, this wider at Ijase, much nar- 

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

 as to form a counuon cross! lar; each also with narrow 

 marginal line and humeral spot, black; under surface 

 black; antenme and legs yellow, the hind thtghs often 

 with black spot. Thorax sparsely and rather cuarsely 

 punctured. Elytra with well deflned though sinuous rows Wg 4a x o 

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



Throughout the State; comiiion. May 2.")~AuM'ust 2. Ocetu's on 

 foliage of hickory and elm and on that of many liorhs alon,^' road- 

 sides. The color varies greatly. The yellow is sonietiiiics i)ale, 

 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 nnulian line of 

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

 black. The sparsely {)unctured thoi-ax and y(>llow legs will starve to 

 distinguish it from .spninariiis and othpi- closely allied forms. 



2084 (O(IGO). rAC'KYBRAciivs ABDOMiiN.MJS Say, Jouru. Phil. Acad. Nat. 

 Sci., Ill, 1S21, 4;'.7; ibid. II, 2r,:;. 

 Form and size of the preceding. Head and thoi'a.x tlull grayi.sh-ycllow, 

 irregularly clouded with markings formed by blu<-k punctures. Klytral 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 c(jarsely 

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

 varying much in size and shape. I^ength 2-3 mm. 



Northern thii'd of State, frequent; not taken south of Marshall 

 gnd Kosciusko counties. lAIay 12-June 3(1. Taken l)y sweeping 

 herbage in low, moist placets. 



20S."; (CiGOO). Pachybbachys atomakius 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. 



Lakt\ Marshall and St. Joseph counties; scarce. May 29- 



June 11. 



