172 Journal New York Entomological Societv. [Vol. xvi. 



Described from four specimens, San Diego, Cal., July 8 and 10, 

 collected by G. H. Field and bearing sub-labels " Tallys " and 

 " Julian." I have also before me three other specimens labelled San 

 Diego, Cal., July 27, W. S. Wright, that are very much whiter than 

 the above, which I have no doubt are the same species, but bleached 

 and rubbed from their longer exposure.. 



Cotypes, Cat. U.S.N.M. No. 11,932, and my collection. 



Eucosma sandiego, new species. 



Expanse $ 25-27 mm., O 27-2S mm. 



Head light ochreous brown ; palpi short, projecting scarcely half eye-width be- 

 yond head, brush compressed, concealing third joint, externally ochreous brown, 

 internally whitish ; antenna flattened laterally in male, serrate and finely ciliate, 

 whitish brown ; thorax brown, posterior end white ; abdomen whitish fawn, the two 

 anterior joints above white; legs whitish fawn, shaded with brown. 



Forewing. — Rich chocolate-brown, marked with silvery white spots, which 

 occur as follows : An irregular median streak from base to inner fourth, principally 

 above fold, but sending a short spur, at its outer end along fold ; beyond, before middle, 

 is a quadrate spot in middle of wing ; beyond this are two spots, one smaller, ovate 

 in shape, is between tornus and lower angle of cell, the upper one elongate, resting 

 beneath costa between middle and outer fourth ; above its outer attenuated end is a 

 small dot on costa ; just before apex is an inwardly curved streak, sometimes divided 

 by a line of ground color so that a dot forms at its inner end ; just below apex is a 

 smaller similar streak, below which three or four dots margin the termen to tornus, 

 all of the spots are more or less distinctly outlined with darker scales. The dorsal 

 edge is narrowly lined with silvery white from base to outer fifth. Cilia light brown, 

 speckled with whitish. 



Hindwing. — Pale fuscous, cilia whitish, with a slightly darker basal shade. 

 Underside light ochreous gray ; underside forewing ochreous brown, with the spots 

 of upper surface indistinctly repeated in an ochreous shade. 



Light form ; marked as above but ground color is light ochreous brown or pale 

 fawn ; head, thorax and other parts of the same shade. The male costal fold is dark 

 brown in the dark form and dark fawn in the light form, it is short extending only 

 to inner fourth. 



Four specimens, two males and two females, one pair of dark form 

 and one pair light form. San Diego, Cal., September 15-29, George 

 W. Field; Walters St., Cal., April, from J. B. Smith. Cotypes J 

 and $, Cat. No. 11,930 U.S.N.M. and in my collection. 



This species is closer to ridingsana Rob. than any other of the sil- 

 very spotted Eucosma' s ; it can be separated by the median line, which 

 in ridingsana is continuous from base to beyond middle of wing ; the 

 silvery costal streak, on inner half of wing (absent on male fold) of 

 ridingsana is entirely absent in sandiego ; the terminal line of dots of 



