346 



"Ventral surface pale green, with darker green lines and the wing cases 

 with whitish rays." (Porritt, Ent. Mo. Mag. XXII, 104-5.) 



28. Platyptilia albertae n. sp. PI. XLIV, fig. 8. PI. L, fig. 6. 



White. Antennae dotted above with gray-brown. Frontal tuft as long 

 as head, sharply pointed. Palpi moderate, oblique, surpassing front but not 

 reaching end of tuft. Fore and middle legs white, shaded with blackish inside. 

 Hind legs darker on outside, annulate at bases of spurs and tips of tarsal 

 joints. 



Primaries white. Costa narrowly brownish gray to cleft. Cleft preceded 

 by two dark dots ; a third similar dot in middle of cell. Lobes with terminal 

 and median grayish shades defining the broad outer white line. Fringes white, 

 basal scales on outer margin also white, grayish in a few spots. Hind wings 

 light brownish gray, fringes and third lobe slightly paler. Fringes with a very 

 faint trace of a median cluster of grayish hair-like scales just beyond middle 

 of third feather in one paratype ; entirely without dark scales in the remaining 

 specimens. Expanse 24-27 mm. 



The shape of the primaries is distinctive. Toward the apex the costa is 

 abruptly rounded, the apex is very blunt, and the outer margin of the first 

 lobe almost straight. The first lobe, and consequently the entire wing, looks 

 very wide and blunt. 



The male genitalia are similar to those of pnllidactyla but differ in the 

 form of the valves and uncus. 



Described from four specimens as follows : 



Holotype 9 , Laggan, Alta., Aug. 16-23, and one paratype 9 , OljTnpic 

 Mts., Wash., in coll. Barnes. 



Allotype, Mt. Cheam, B. C., Aug., in coll. E. H. Blackmore. 



Paratype 9, Laggan, Alta., Aug. 16-23, U. S. N. M. No. 23463. 



This beautiful species is very distinct from all others. Extremely 

 pale examples of pallidactyla resemble it superficially, but the form 

 of the wings and relative size of palpi and frontal tuft are conspicu- 

 ously different. Unfortunately the wings have a tendency to stain 

 very easily, and three of the types are more or less tawny. Only the 

 holotype is a clean specimen. 



We have no data on the life history. 



Genus Exelastis Meyrick 



? Orthotype atomosa Wlsm. 



Exelastis Meyrick, Jn. Bomb. Nat. Hist. Soc. XVII, 730, 1907 (fide Meyrick). 

 Id., Gen. Ins. C, 17, 1910. 

 The one North American species which we incUule in this genus 

 differs from Marasmarcha in structure only in the presence of a few 



