307 



Prodoxus ciNEKKUS. Larvo (Fij^'. 38a). — Avera<>e length wlieii full-grown, 8.25""" ; 

 body elongate, but slightly curved, the Joints nionilifonn; lu'ad rallu'r large, more 

 horizontal, and more free than in other species, liglit brown in color, <larkcr 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 i)ale, but fuscous around the borders and 

 especially at the middle of the anterior border ; sinuate laterally and cleft i)osteriorly 

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

 anal hooks, situated on the ventral apex; anal plate br.t faintly chitinous and with 

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

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

 a faint yellow anuulus, the j)ro-thoracic pair situated ou the sub-vtmtral depi-essed 

 line, the others much higher u]) 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 C(dor, however, in alcohol. 



Pupa (Fig. 38&). — Ottering no 2)eculiar structures of importance, but presenting 

 the characteristics of the other species of the genus. vSkin very delicate ; the cephalic 

 projection not very prominent and the anal tip absolutely 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 xnishes from the surface of the thin epidermis to give forth the imago. 



The images 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 pupie which have wood- or pith-boring larvsp. 



Prodoxus cenescens. — Prof. Trelease lias sent me a full account of the 

 oviposition of this species upon Yucca ivhipplei, and it corresponds in 

 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 

 of ichipplei but occurs on both the typical form and the variety [/rami- 

 nifolia. 



Prodoxus inter medius. — This species ^Yas described from two female 

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

 interesting form, bearing an even more deceptive resemblance to Pro- 

 nuba, yuccasella than does the much commoner Prodoxus dccipiens. For 

 though the female lacks the remarkable maxillary tentacles of Pronuba, 

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

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

 a male of this rather i)uzzling 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 Avith great difficulty 

 from the males of Pronuba yuccasella; 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, corresi^onds with 

 that of Prodoxus decipienSy yet the claspers agree more nearly with 

 those oi Pronuba yuccasella in liaving but the one large tubercle. 



Prodoxus intricatus n. sp. — I recently received from ]\Ir. 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 



