298 G. H. HORN, M. D. 



them fasciatus. 



Lateral groove behind the eyes only, limited exteriorly by a 



slight ridge pallidas. 



Lateral groove represented by a slight fossa behind the eyes nigrellus. 



Lateral groove entirely absent, no traces whatever canadensis. ' 



It will thus be seen that those species with the sutural stria have 

 the lateral stria of the head entirely absent. 



The color of our species may be thus expressed. 



Pale rufo-testaceoua, head somewhat darker pallidus. 



Piceous black, elytra with broad testaceous band fasciatus. 



Piceous; surface equally shining; thorax flat.... canadensis. 



Black; thorax less shining, disc slightly concave nigrellus. 



The epistome varies in our species, 



being rounded in front canadensis. 



truncate fasciatus, ami pallidus. 



slightly emarginate nigrellus. 



I. pallidus, Loc. New Species, p. 58. — Pale rufo-testaceous, sliining. Head 

 flat, very finely alutaceous and finely but distantly punctured, sliglitly darker 

 in color than the elytra. Thorax triangular slightly broader than long, base 

 less than half as wide as apex ; apex truncate base rounded: anterior angles 

 obtuse rounded; sides feebly rounded and with a slight sinuation behind the 

 middle; anterior margin with a slight impression on each side; disc very 

 faintly concave and with fine median line; surface finely alutaceous and 

 sparsely punctured. Elytra as broad as thorax at apex, slightly broader be- 

 hind, slightly longer than wide conjointly, surface very finely longitudinally 

 strigose and sparsely punctulate. Abdomen finely alutaceous jabove and the 

 segments on each side with four punctures, in pairs, forming a rhomb those 

 nearer the anterior margin more internal. Body beneath similar in color and 

 sculpture to upper surface. Legs slightly paler. Length .14 inch; 3.5 

 mm. 



Occurs from New York to Washington, D. C., but rare. 



I. fasciatus, Lee. New Species, p. 59. — Black, shining, elytra with broad 

 yellow band not attaining the lateral margin. Head very finely alutaceous 

 and very sparsely punctulate. Thorax triangular, as long as wide, base half 

 as wide as apex; apex truncate, margin on each side with slight impression ; 

 base slightly rounded, sides feebly rounded and with slight sinuation at 

 middle; surface flat, very finely alutaceous, sparsely punctulate and with 

 finely impressed median line. Elytra finely longitudinally strigose an<l 

 sparsely minutely punctulate; color black with broad yellow band wider ex- 

 ternally, sides narrowly margined with black; elytra conjointly subcpiadrate. 

 Abdomen finely alutaceous and with four punctures on each segment, two an- 

 terior and two posterior, the anterior more external. Body benerfth similar to 

 the upper surface. Legs forrugiuuus, knees paier. Length .10 — .12 inch; 2.5 — 

 3 mm. 



Occurs along the valley of the Gila River, Arizona, under cotton - 

 wood bark ; rather couiuiou. 



