140 Journal New York Entomological Society. [Voi. xv. 



dark fuscous brown scales ; they congregate before the middle of the wing into an 

 imperfect, curved, transverse fascia, before which is a nearly immaculate white area 

 and beyond which the dark scales form poorly defined, irregular, longitudinal lines, 

 meeting at apex. Hind wings yellow with light yellow cilia. Abdomen dark fuscous. 

 Legs pepper and salt colored. Alar expanse : 20 mtn. 



Habitat. — Yuma Co., Arizona. Desert. 



Type. — U. S. Nat. Mus., No. 10324. 

 To this genus belongs also Colinita arizoniella Kearfott, described 

 as Holcocera (Can. Entom., XXXIX, p. 8, 1907). This is a smaller 

 unicolored white species. 

 Dyotopasta, new genus. 



Type. — Plutella yumaella, Kearfott.* 



Head with rough scales. Labial palpi long, curved; second joint with rough 

 scales above, towards the face and with a few lateral bristles ; terminal joint short, 

 blunt, porrected. Tongue and maxillary palpi obsolete. Antennae little more than 

 half the wing length, simple, with the somewhat enlarged basal joint thickly clothed 

 with scales. Ocelli large, in front of the base of the antennae. Thorax smooth. Fore 

 wings elongate, three and one half times as long as broad ; apex rounded ; costal edge 

 nearly straight ; dorsal edge evenly rounded and slightly sinuate at the end of the 

 cell. 12 veins, all separate; 7 to apex; 2 from shortly before the end of the cell ; 

 internal veins from between 10 and 11 to below 8 and from base to above 5; 

 \b strongly furcate at base. Hind wings broader than fore wings; costal edge 

 deflected at apical third ; termen strongly oblique and slightly sinuate. 8 veins ; 

 3 from corner of cell ; 4 distant, parallel with 3 ; 5 and 6 shortstalked ; 7 parallel 

 to 6 ; lb furcate at base ; \c present. 



I have long had this genus and its type in manuscript ' as has also 

 Lord Walsingham, from whom I lately have received a specimen, 

 bearing an appropriate generic name, which I was tempted to adopt. 

 I should have preferred to await Lord Walsingham 's publication of the 

 genus, but the premature description of the type under a wrong gen- 

 eric name in another family makes it desirable to have its proper 

 generic position published without further delay. 



The genus looks superficially much like Xylesthia Clemens, to which 

 genus it comes near, though differing in the lack of maxillary palpi 

 and in the form of the labial palpi. 



*Can. Entom., XXXIX, p. 6, Jan., 1907. 



