Coleopterological Notices, VI. 713 



prothorax; post-scutellar impression wide and distinct; omoplates large and 

 very feeble; punctures moderately large, strong, separated by more than their 

 own widths. Ahdomoi dull, minutely, strongly and extremely densely punc- 

 tate. Legs rather long, stout. Length 4.0 mm.; width 1.3 mm. 



Indiana. 



This is a, fine species, one of the largest of the genus, and is not 

 closely related to any other. The male has the fifth ventral feebly 

 truncate at apex and slightly flattened on the disk toward the 

 middle, the genital segment rather small, trapezoidal, with the 

 somewhat narrow apex emarginate in circular arc throughout, the 

 copulatory sheath stout, gradually narrowed to a blunt point, 

 straight in profile, and, in general structure, ver}^ simple, re- 

 sembling somewhat that o( cerviuus. Two specimens. 



These quadrimaculate species form quite a distinct and natural 

 group by themselves, and have the four elytral spots remarkably 

 constant in form and size through long series. These spots are 

 evidentl}^ due to pi'otective mimicry, possibly of some species of 

 Bembidion, and have therefore been gradually evolved by natural 

 selection ; their constancy is easily accounted for in this way. 



33. A. haldeinani Lee— Proc. Acad. Nat. Sci., Phila., 1852, p. 100; 

 quadriguttatus \\ Hald. : 1. c, II, p, 304. 



Scarcely stout, convex, polished, black, the legs, antennte and, 

 on each elytron, a large subtriangular spot at basal fourth and 

 another smaller and rounded at apical fourth, rufous ; pubescence 

 even, cinereous, very short, subdecumbent and not dense. Head 

 convex, wider than long, truncate and impressed at base, finely 

 but strongly, rather closel}' punctate, with an entire smooth line ; 

 eyes well developed ; antenna rather stout, strongly incrassate. 

 Prothorax much narrower than the head, as long as wide, convex, 

 broadl}' rounded at the sides anteriorly, obtusely constricted at 

 basal fourth, finely but strongly, densely punctate. Elytra three- 

 fourths longer than wide, distinctly more than twice as wide as 

 the prothorax, closely, deeply and moderately coarsely punctate. 

 Length 2.7 mm.; width 0.85 mm. 



Pennsj'lvania. There is only a single specimen before me, but 

 I have failed to observe an}' variation in color, in allied species 

 which are represented b}^ good series, similar to that reported of 

 this by LeConte, and think there must have been some confusion 

 of species. 



