150 MISSOURI BOTANICAL GARDEN. 
than of a Rhyncophorous larva. General color pale greenish. Head 
honey-yellow, darkest in front with a broad brownish anterior border, 
more or less distinct, and a narrow blackish lateral line and dusky mark- 
ings each side of the clypeus, thus resembling that of P. marginatus. 
The cervical shield with two or three more or less confluent faintly dusky 
spots anteriorly and 2 rather well defined somewhat quadrate black spots 
posteriorly. 
CurysaLis. —Scarcely distinguishable from that of decipiens, except 
by the smaller size, smaller spines, and finer sculpturing. The frontal 
tubercle is relatively shorter and stouter. 
IMaco, — Expanse, Q 14.7 mm.; of 11.2—14 mm. General color, 
bronzy, the primaries with a distinct purple reflection. Under surface 
of thorax, the coxe and the femora clothed with white scales. Head 
whitish, with scattered black hairs; labial palpi with black hairs; 4th 
and 5th joints of maxillary palpi and the antennx, except at the base, 
black. Integument biack. Apical abdominal joint (Fig. 3, a) swollen 
as in P. decipiens and obliquely truncate from above, but the tip is also 
truncate from beneath and the lower border is slightly excavated. 
Ovipositor short and stout, very broad; the upper border of the horny 
terminal joint (Fig. 8, ¢jo) thin, arched and finely serrate, the tip 
obliquely truncate beneath and at the base of the truncation forming a 
small, thin tooth, the base beneath forming a blunt tooth, the Borda te 
tween these teeth retuse. Claspers of ¢/ (Fig. 3, c) with no teeth on the 
arms beneath; the arms more slender than in cinereus and narrowed more 
abruptly near the base; the broad basal part with a small tooth at the 
apex within. Large upper basal piece forming a stout process at the apex. 
Described from 20 females and 38 males taken from 
Southern California, many of them reared from the main 
stem of Yucca whipplei. 
PRODOXUS PULVERULENTUS, ND. sp. 
I have five specimens of this species, all females, two of 
them reared from the seed-pods of Yucca whipplet in May, 
1886, by Mr. Koebele, the pods obtained at Santiago, Cal- 
ifornia, while three specimens were given me by President 
H. W. Harkness, and Mary K. Curran, of the California 
Academy of Science, in April, 1887, and obtained from 
the flowers of the same Yucca. The adolescent states 
are still unknown. 
IMaGo 9 .—Expanse 9-10 mm. General color, white; head with the 
antenns white, the basal half fuscous; eyes brown; palpi pale yellow- 
ish, hairs white. Thorax, with the hair mixed with a few blackish scales; 
primaries white, more or less densely sprinkled with blackish scales at 
the posterior third and sparsely so on the remaining portion. These 
dark scales produce a powdery appearance of the wings, the amount 
varying in thespecimens before me, there being in two of them buta faint 
trace of the darker scales; secondaries white, with a broad dusky 
anterior margin; under surfaces more densely flecked with blackish 
scales and hence somewhat darker. Abdomen fuscous above, witha few 
long whitish hairs on the terminal two joints; venter and legs white. 
Tip of the abdomen shaped as in P. marginatus. 
