VOL. iv.J General Bird Notes, 227 



slender black and yellow hornet was found on this date pulling 

 one of the larvae out of its case. 



The cases of this species are constructed of little leaflets of 

 the mesquite, fastened together longitudinally with silk into an 

 irregular, more or less tubular bag-like case, so as to protect the 

 larva inside. The leaflets which compose the case are always more 

 or less eaten along the midrib, but not entirely through. The 

 cases bear considerable resemblance to those of Psyche confederata. 

 Hanging perpendicularly from the leaves while the larvae are 

 feeding, they give the mesquite bushes the appearance of being 

 hung with miniature bag- worms. 



Some of the larvae in their cases were sent to Dr. Packard. 

 They reached him as pupae. From one of these an imago 

 appeared, which Dr. Packard wrote me was •' an unknown 

 tineid." I am unable therefore to suggest the genus to which it 

 belongs. 



Description of larva. Length, 9 to 12 mm.; width anteriorly, 

 nearly lYi to 1^4 mm. White; head black, somewhat polished, 

 with a slight reddish area on each side dorsad of eyes; protho- 

 racic segment with dorsum brownish black, except a median 

 longitudinal whitish dividing line. Consisting of thirteen seg- 

 ments; appearing from above as though possessing two extra 

 ones, since the two terminal segments each bear a transverse 

 suture or wrinkle on dorsum. Head and prothorax about equal 

 in width; third segment distinctly wider, segments 4 to 6 nearly 

 same width as 3, 7 and 8 very gradually narrowing, 9 to 11 

 about or hardly as wide as 8, 12 and 13 gradually narrowing 

 from II, 13th segment a little more than one-third width 

 of 3d. Head usually not retracted, a little wider than long; 

 prothoracic and third segments a little shorter than head, 4 

 about as long as head, 5 slightly longer, 6 and 9 to 1 1 a little 

 longer than 5; 7, 8, 12 and 13 about as long as 5. Head and 

 prothorax chitinous, rest fleshy. Head subhemispherical, con- 

 vex dorsally, with a few fine hairs on anterior border, and 

 several on dorsum; all the other segments with a number of 

 hairs (about ten) arising from minute papillae, four usually 

 being dorsal, the others lateral and ventral. Eyes con- 

 sisting of six small but prominent bead-like glassy 



