Additional Notes on Prodoxus. 49 



color, darker anteriorly ; borders of clypeus almost white ; pigment spot 

 around ocelli, and the mandibles 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 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 

 indicated and more highly polished than the rest of the surface ; spira- 

 cles extremely small, with a faint yellow annulus, the prothoracic pair 

 situated on the sub-ventral depressed line, the others much 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 yellowish-green, 

 losing color, however, in alcohol. 



P»pn.— Offering no peculiar structures, but presenting the characteristics 

 of the other species of tlie g&nus ; skin very delicate ; the cephalic projec- 

 tion 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 pushes from the surfiice of 

 the thin epidermis to give forth the imago. 



'J'he 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 pupje which have wood- or pith-boring 

 larva?. 



Prodoxus xiiescens.—FvofessoY Trelease has sent me a full ac- 

 count of the oviposition of this species upon Yucca ivhipplei, and 

 it corresponds in every particular with the oviposition of Pro- 

 doxus decipiens in the East. In this case the species is not con- 

 fined to one or the other of the fonns of whipplei but occurs on 

 both the typical form and the variety graminifolia. 



Prodoxus iyitermedius.— This species was 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 de- 

 ceptive resemblance to Pronuha yuccasella 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 in the latter species. I have been 

 anxious, since pubHshing the original description, to obtain a 

 male of this rather puzzling species, and, fortunately, Professor 

 Trelease sent me specimens associated with the females. On a 

 superficial examination the males of this species would be sepa- 

 rated with great difficulty from the males of Pronuba yuccasella; 

 but upon denuding the genitalia the differences at once appear, 



7— Biol. Soc, Wash., Vol VIII, 1893. 



