48 Blley — Notes on Yucca Insects and Yucca Pollination. 



middle of the tliorax ; characters not noticeable except in well- 

 preserved specimens. The white portion of the antennae extends 

 also in tliese two specimens beyond the basal third and fully to 

 one-half the length of the organ. The four collected specimens 

 from Professor Trelease indicate considerable variation ; in one 

 specimen the outer arm of the transverse Y-band across the pos- 

 terior portion of the wing being absent, while in another it is 

 broken, as is also the basal portion of the median band. The 

 same is true of the band across the middle of the Aving, while 

 the upper portion of this band is connected with the basal band. 

 The larva shows no striking characteristics, but is very similar 

 to most other Prodoxid larva^, being uniformly yellowish-white, 

 the head and cervical shield anteriorl}'' slightly darker, tlie ocelli 

 black, and the mandibles brown and three-toothed. 



Prorloxus reticulatiis. — One of the specimens received from Tre- 

 lease taken in flowers of Yucca ^rhipplei, variety graminifolia, 

 at Arrowhead Springs, in California, would indicate that this 

 species, which I described from three females from Los iVngeles 

 county, California, and the habits of which were not known, 

 breeds in some part of this Yucca. The single female sent by 

 Trelease is interesting in that it shows some variation in the 

 direction of coloradensis, especiall}'' by the separation of the basal 

 half of the W-shaped band. 



Prodoxus cinereus. — A section of the flower-stem of Yucca 

 ivhipplei sent me by Mr. Coquillett last July contained a number 

 of diff'erent larvse, and among them most numerously one which 

 sul)se(iuently })roved to be the larva of Prodoxus cnie.reus. We 

 have known that this species breeds in the main stem of this 

 Yucca, Init none of the early states had been ol)served. The 

 larva is i-cmarkal)le in that it differs materially from the typical 

 Prodoxus larva. It is, first of all, very mucli more elongate, 

 Avith the sutures between the segments more strongh^ impressed. 

 It is, further, more uniform in diameter than the ty[)ical Pro- 

 doxus larva ; l)ut the most striking feature is the anal segment, 

 which bears on its ventral i)late two stout, brown, decurved 

 horns resembling those of the larva of Trogosita in Coleoptera, 

 except tliat these are curved in the opposite direction. I add 

 a technical description : 



Prodoxus cinereus. Larva. — -Average length when fall grown, S.i^o nun.; 

 body elongate, but slightly curved, the joints moniliform ; head rather 

 large, more horizontal, and more free tlian in other species, light hrown in 



