A. ambiguus Say, Trans. Am. Phil. Soc. II, 1825, p. 96. 

 reticulatus Aube. Spec. Gen. p. 355. 

 fimbriatus Lee. Ann. Lye. Nat. Hist. N. Y. V, 1851, p. 214, 



Oval, moderately convex, piceous, elytra brownish fuscous with the limb paler ; 

 antennae and legs rufous, the posterior ones often more or less infuscate; epi- 

 pleura piceous or -fuscous, concolorous with the lower surface in fully colored 

 specimens. Upper surface very conspicuously irregularly reticulate, the elytra 

 with secondary minute reticulation or alutaceous sculpture, which is as a rule 

 better denned in the female; minute elytral punctures virtually lacking. Hind 

 tibiae with a series of a few punctures along the inner margin basally. Protarsi 

 of male distinctly dilated and densely clothed beneath with glandular hairs which 

 bear distinct palettes in apical half. Length 8 to 8.3 mm. 



This is a common species in the Northeastern States. It ranges 

 from Canada (Montreal) to Virginia (Warm Springs) and westward 

 to Dakota (Brookings-Sherman collection) and Manitoba. The 

 following additional specific localities are represented before me. 

 New Hampshire (Randolph; Farmington) ; Massachusetts (Framing- 

 ham); Pennsylvania (Chambersburg; Harrisburg; Bethlehem); 

 Illinois (Vicinity of Chicago); Michigan (Marquette; Huron Mt. 

 Club.) 



Although not hitherto so recognized, I have no doubt whatever that 

 this species, commonly known as reticulatus Aube, is the true ambiguus 

 of Say. Following his description, Say says of ambiguus, "it ap- 

 proaches very closely to erythropterus, but may be distinguished by its 

 smaller size, less dilated form" etc. The present species does quite 

 closely resemble erythropterus, differing therefrom in precisely the 

 ways which Say indicates. Another highly significant statement made 

 by Say is that the epipleura are black. They are so in reticulatus 

 Aube, but not in any of the other species (infuscatus, discolor, con- 

 gener) with which ambiguus has been identified by later authors. Add 

 to this the fact that reticulatus Aube is a common species in Eastern 

 Pennsylvania the type locality of ambiguus and that infuscatus and 

 congener and probably also discolor do not occur there, and the con- 

 clusion that ambiguus and reticulatus are one and the same species 

 seems inevitable. By some oversight fimbriatus Lee. is made a syn- 

 onym of reticulatus Kby in the Leng Check List. The latter is really 

 synonymous with arc tic us Payk. 



A. erythropterus Say, Trans. Am. Phil. Soc. II, 1825, p. 95. 



The large size, broad, rather convex form which tends to become somewhat 

 obovate, especially in the female, coarsely reticulate elytra, the meshes becoming 

 strongly longitudinal basally in the female, and the perfoliate protarsal claws in 

 the male, make the recognition of this common species easy and certain. The 

 color as well as the sculpture, except for the darker legs and modified elytral 

 reticulation in the female, are practically the same as in ambiguus. Males, as 

 a rule, are a little larger than the females. Length 8.5 to 9.5 mm. 



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