AMERICAN COLEOPTERA. 293 



but few species iu the entire genus, the elytra are in fact so complete 

 that merely the tip of the pygidium is exposed. 



Specimens are before me from Fort Whipple, Arizona, collected by 

 Dr. Palmer, others from Colorado, by Morrison. 



E. ambigua Mann.-Oblong oval, rufo-testaceous, elytra often clouded 

 with fuscous surface slightly shining, sparsely pubescent. Head sparsely 

 punctulate. Antenna rufous, club darker, funiculus as m monogama Thorax 

 nearly twice as wide as long, apex feebly en^arginate, base a l.ttle w,der than 

 apex, broadly arcuate at middle, sides moderately arcuate, near the base 

 Obliquely narrowing, margin explanate and slightly reflexed, ^md ang s 

 rectangular, surface sparsely punctulate. Elytra oblong oval, gradually nar- 

 rowed to apex, one-half longer than wide at base, margin very narrowly 

 reflexed, obsolete near the tip, surface finely and rather sparsely punctulat^. 

 Body beneath sparsely punctulate, abdomen more evidently prothorac.c s.de 

 pieces smooth. Femora sparsely punctulate. Length .15 inch; o.7o mm. 



The sexual characters are as in integra but better marked, the 

 sinuation of the middle tibia of the male being stronger and the 

 inward prolongation of the tip greater. 



The elytra are prolonged rather obliquely and there is but little 

 separation at the tip, so that the abdomen is completely concealed^ 

 The sculpture is finer than in integra and there is no trace ot 

 .inuation of the side margin of the thorax, merely an oblique 

 narrowing. 



Occurs from Alaska to California. 



E. Eriefesonii Reitter.-Oblong oval, pale luteous, moderately shining, .. 

 sparsely clothed with fulvous pubescence. Head sparsely punctate Antenna 

 pale luteous, formed as in monogama. Thorax less than twice as wide as long, 

 slightlv narrowed in front, apex feebly emarginate, base feebly sinuate on 

 each side, sides feebly arcuate and subparallel behind, hind ang es rectangular 

 margin feebly depressed, slightly reflexed, surface moderately de^^^'y ^^ 

 rather coarsely punctate. Elytra one-third longer than wide, sides eebly 

 arcuate and slightly narrower to apex, tips truncate, margin narrowly re- 

 flexed, disc subdepressed, surface moderately densely punctate. Thorax be- 

 neath comparatively smooth, body and abdomen rather coarsely and densely 

 punctate. Femora rather coarsely but sparsely punctate. Intercoxal process 

 triangular acute. Length .10--.12 inch ; 2.5-3 mm. _ _ 



The sexual characters are as in Hornii, the smuation of the middle 

 tibia of the male being rather deep and the inward prolongation of 



the tip well marked. ,. „ . , u 



For a type of this species I am indebted to Mr. Reitter, through 



the kind intercession of Dr. C. A. Dohrn. 



Occurs ii-om Canada to Georgia, and is not rare. It has been con- 

 founded with labilis Er., from which the sexual characters of the male 

 are the only ones to be relied on to distinguish it. 



