YUCCA MOTH AND YUCCA POLLINATION. 149 
The species prefers the main stem of the plant for purposes 
of oviposition. Stems, received in May, 1887, gave forth 
the moth during the latter part of that month, but others 
issued from the same stems during the same month of May 
in the consecutive years of 1888, 1889 and 1890, thus 
indicating great variation in the development of the species 
and a remarkable tendency to retarded development. The 
eggs and the early states have not been observed, nor the 
earlier states preserved and described. 
IMaGo <'. — Expanse 12 mm. Head, thorax, legs and apical ventral 
joints whitish. Primaries ashy; secondaries and under surface of all 
the wings brown with a cinereous reflection. Tip of maxillary palpi and 
apical third of antennz black; the integument of body black. Claspers 
(Fig. 4, a, 6) dark testaceous, similar in form to those of decipiens 
but without teeth; large upper basal piece broadly rounded or subtrun- 
cate; the smaller piece beneath it of similar shape. 
Q showing no differences whether as to size or coloration of scales, the 
head being somewhat darker, on the average. Anal joint of same form 
as in decipiens, the ovipositor being more slender than in any of the other 
species of the genus and coarsely toothed along the entire upper edge. 
Described from many specimens. 
PRODOXUS ANESCENS Riley. 
[Pl. 43, Fig. 3.] 
This species was also described in the same paper as the 
preceding from 3 females and 8 males collected by Mr. 
Morrison, in Kern county, California, but I have since 
reared it from the main stems of Yucca whipplei, also 
collected by Mr. Koebele, at Newhall, Los Angeles Co., 
California. The egg and mode of oviposition have not yet 
been observed, but Mr. Koebele reports that the larger 
larve (doubtless those which produce females) work in the 
stem with the head upward, while the smaller larve work 
downward, and that they go through their transformations 
in the month of May. I have serious doubts whether there 
is any sexual difference in the position of the larve in the 
stem, as might be gathered from his observation. 
Larva. — Attaining a length of 9 mm. with a diameter of only about } 
the length, and distinguished from the other species by this greater 
slenderness and relatively greater length. The body tapers but little 
posteriorly and the general aspect is more that of a Cerambycid larva 
