196 



fuscous and appearing quite dark, with a trace of the t. p. line showing through 

 as a black shade; a terminal row of black dots; secondaries whitish, powdered 

 with fuscous along costal margins; a faint terminal row of blackish dots; 

 fringes as on upper side. 



Expanse: about 26 mm. 



Three males and two females are in the Barnes Collection, pre- 

 sumably all conspecific. The females, however, differ from the males 

 by having the mesial half of the median space much paler than the 

 distal half. One male, from Deer Creek, Utah, has slightly darker 

 secondaries. One of the females is from Vineyard, Utah. 



Apparently most closely allied to the species now going under 

 the name aplastella Hulst, which is represented by a so-called "type"' 

 in the Hulst Collection, a female labeled Colorado ; but much more 

 powdery, entirely black and white, lacking any brownish tint on the 

 primaries, and with shorter processes to the basal antennal joints. 



In order not to run the risk of a mixed type series the types of 

 the present species are restricted as follows. 



Type locality: North Fork, Provo Canyon, Utah (Tom Spalding). 

 Number and sexes of types: Holotype $ ; \ $ , Paratype; both "VIII-4". 



Tetralopha arizonella sp. nov. 



Head, collar and palpi dull grey tinged with ochreous. Thorax dull rufous- 

 grey. Abdomen ochreous, with more or less grey powdering. Primaries : dull 

 bronze color, powdered with dull violaceous-grey scales; t. a. line double, black, 

 included space violaceous-grey, outwardly oblique, but irregular, from costa 

 to inner margin; median shade composed of jet-black tufts of scales; t. p. line 

 a blackish shade, followed by a violaceous-grey shade, somewhat inwardly 

 oblique from costa to inner margin, only slightly excurved around cell, pro- 

 duced to points on the veins ; s. t. shade obsolescent ; a thin black terminal line, 

 interrupted by pale points on the veins; fringe nearly concolorous with the 

 wing, with a paler line at the base, and an obsolescent darker interline. Sec- 

 ondaries : whitish, heavily suflFused with fuscous and appearing cupreous-grey ; 

 veins darker; fringe j'ellowish at the base, with darker interline, and white tips. 

 Beneath: whitish, more or less suffused with fuscous; with darker veins; t. p. 

 line showing through on the primaries ; terminal line on both pair of wings as 

 on upper side; else immaculate; fringes as on upper side. 



Expanse: 25-26 mm. 



Superficially resembling aplastella Hulst but with much shorter 

 palpi and much longer processes from the basal antennal segments in 

 the males, in these characters not dissimilar to fuscolotella Rag. 



