YUCCA MOTH AND YUCCA POLLINATION. 153 
PRODOXUS SORDIDUS, Nl. Sp. 
I first found this species in the flowers of Yucca brevifolia 
on the occasion of the discovery of Pronuba synthetica, 
while other specimens were subsequently obtained by Mr. 
Koebele. In general appearance the species seems nearest 
related to P. cinereus, being, however, much paler, with 
the greater portion of the hind wings white. 
IMAGO. — ¢. Expanse 8-10 mm.; 911-13 mm. General color creamy- 
yellow, the females showing the most white. A more or less distinct 
dusky or blackish posterior margin to the secondaries, the dark color 
broadening toward the apex. The undersurfaces have a tendency to 
metallic reflection and the darker color of the hind border of the second- 
aries is repeated. Abdomen grayish-brown dorsally, with iridescent 
reflection. Anal segment of 9 reddish-brown, obliquely truncate from 
above, the tip rounded. Ovipositor yellowish-brown, slender and finely 
denticulate along the upper edge. Male claspers similar in shape to 
those of decipiens but more slender, the base comparatively broader and 
the apex more abruptly rounded; the basal side-piece narrower and 
pointed at tip; the posterior edge with from 3 to 5 small slender teeth. 
Described from 5 males and 5 females. 
