307 



Prodoxus ciNEREUS. Larva (Fig. 38a). — Average length wlieu full-grown, 8.25"™; 

 bod}- elongate, but slightly curved, the joints moniliform ; head rather large, more 

 horizontal, and more free than in other species, light brown in color, darker ante- 

 riorly; borders of clypeus almost white; pigment spot around ocelli, and the man- 

 dibles dark brown ; the Y-shaped lines distinct and having exactly the outline of a 

 rather narrow wine-glass; cervical shield pale, but fuscous around the borders and 

 especially at the middle of the anterior border ; sinuate laterally and cleft posteriorly 

 by the pale mesial line; characteristic feature is a pair of decurved, dark, horny 

 anal hooks, situated on the ventral apex; anal plate but faintly chitinous and with 

 a fuscous mark upon it; a sub-ventral depressed line but faintly iiulicated, and 

 more highly polished than the rest of the surface: spiracles extremely small, with 

 a faint yellow aunulus, the pro-thoracic pair situated on the sub-ventral depressed 

 line, the others mudi higher up on the anterior third of the segments ; no thoracic 

 legs, but slight tubercles in place of them ; general color faint bluish-green or yel- 

 lowish-green, losing color, however, in alcohol. 



l'iq)a (Fig. 386). — Offering no peculiar structures of importance, but presenting 

 the characteristics of the other species of the genus. 8kin very delicate ; the cephalic 

 projection not very prominent and the anal tip absolutelj- smooth ; dorsal spinules 

 reduced almost to obsolescence. The shrunken larva skin with its two strong hooks 

 remains attached to the tip of the body of the pupa, and doubtless serves to hold it 

 secure when it pushes from the surface of the thin epidermis to give foi'th the imago. 



The imagos issued from the 11th of April to the 8th of May, the antennal sheaths 

 and leg sheaths of the pupa separating, the former curling very much as in other 

 lepidopterous pupa^ which have Avood- or pith-boring larva\ 



Frodoxus (enescens. — Prof. Trelease has sent me a- full account of the 

 oviposition of this species ui)ou Yiicca whipplei, and it corresponds iu 

 every particular with the oviposition of Prodoxus decipiens in the east. 

 In this case the species is not confined to one or the other of the forms 

 oi' Whipple i but occurs on both the typical form and the variety r/rami- 

 ni folia. 



Prodoxus intermedius. — This species was described from two female 

 specimens taken in Texas and one taken in Colorado, in 1887. It is a most 

 interestinji' form, bearing an even more deceptive resemblance to Pro- 

 nulm ynccasella than does the much commoner Prodoxus decipiens. For 

 though the female lacks the remarkable maxillary tentacles of Pronuba, 

 the ovipositor is long and delicate, very much as iu the latter species. 

 I have been anxiims, since publishing the original description, to obtain 

 a male of this rather i)uzz]ing species, and, fortunately, Prof Trelease 

 sent me specimens associated with the females. On a superficial exami- 

 nation the males of this species would be separated with great difiiculty 

 from the males of Prouuba yuccaseUa; but upon denuding the genitalia 

 the differences at once appear, and it is curious to note that while the 

 form of the genitalia, though showing slight variation, corresponds with 

 that of Prodoxus decipiens^ yet the claspers agree more nearly with 

 those of Pronuba yuccaseUa in having but the one large tubercle. 



Prodoxus intricafus n. si). — I recently received from Mr. J. T. Mason, 

 who has been kind enough to observe and collect some of the Yucca 

 insects for me, a number of s])ecimens of a Prodoxus, which he found 

 in the flowers of one of the tree Yuccas in Jalapa, Mexico. He sent also 



