H. C. FALL. 191 



The male is pure white throughout ; the female is feebly 

 mottled with faint oval annular spots, each centered on a 

 strial puncture. In the female the median sulcus of the 

 rostrum is longer than in the male, extending somewhat in- 

 definitely upon the front. 



By Horn's table nivosus would be associated with speciosiis 

 and sordidus. It is much smaller than the former and larger 

 than the latter, and differently colored from either. There 

 is little doubt that this is the species referred to in Mr. 

 Pierce's list as speciosus. 



E. marmoratus n. sp. 



Similar in form to the preceding, densely clothed with ashy white 

 and blackish plumbeous scales, strongly mottled on the elytra, the 

 dark spots centered about the strial punctures, especially in the 9 , 

 the first, third and fifth intervals in this sex with finely intermixed 

 pale brown scales ; prothorax with broad lateral and median plumbe- 

 ous vittae alternating with narrower irregular pale vittas. Head with- 

 out transverse impression, rostrum strongly trisulcate, the median 

 groove very long and deep, reaching a point on the vertex opposite 

 the upper margin of the eyes ; lateral grooves narrower than the median 

 one, but deep and moderately long, nearly straight. Prothorax a little 

 less than one-half wider than long, widest before the middle, sides 

 strongly rounded, the margin uneven from the coarseness of the lateral 

 punctures ; disk coarsely rather closely punctate, median sulcus well 

 marked, entire. Elytra not very much wider than the prothorax in 

 the cf, more broadly oval in the 9 , the form proportions and sculpture 

 as in the preceding species. Length 13-15 mm. 



This species was taken in some numbers by Mr. Wickham 

 at Tucson, Arizona. The type is a cf from an unrecorded 

 locality in Arizona. 



Marmoratus is most closely related to nivosus, differing in 

 its strongly mottled scaly vestiture, more deeply sulcate 

 beak, much more coarsely sculptured prothorax, which is 

 widest in front of the middle. Some specimens of argentatus 

 are similarly mottled, but this has the head transversely im- 

 pressed at the base of the beak, and the prothorax much nar- 

 rower. The Tucson examples show some variation in the 

 development of the rostral sulci, these being finer in some 

 than in the type. 



TRANS. AM. ENT. SOC, XXXVI. JULY, 1910. 



