15-1 Psyche [Oct.-Dec. 



The completed mines are blotch-like and usually extend from 

 the midrib to the edge of the leaf, occupying from one-sixth to 

 one-fourth of the entire leaf surface. They are visible plainest 

 from the upper surface, where they appear as brownish, discolored, 

 dead areas. As a rule, there is only one larva in a mine, but in 

 ]nany cases the mines merge, so that the entire leaf consists of a 

 solid mine containing numerous larv». Many leaves contained 

 from seven to twenty-two small mines. On account of the merging 

 of some of these, and on account of the death of some of the partly 

 grown larva?, only from three to five completed large mines were 

 found in most of the leaves at the end of the season. 



Egg. Lengih, 0.32 mm. Width across middle portion, 0.2 mm. 

 Oval, ends broadly rounded; translucent, somewhat whitish. 



Labva. Length about 3.7 mm. Width of thorax about 1 mm. 

 Form subcylindrical, thoracic segments wider than abdominal ones, 

 body tapering slightly from thorax to posterior portion of abdomen. 

 Segentation distinct. Whitish except for a median dorsal and 

 ventral row of abdominal spots, the head and thoracic shield which 

 are brownish (young larvffi is greenish- white, translucent). Head 

 small, subcircular, sparsely hairy; collum absent; epicranial halves 

 separated dorsally by faint median suture ; front large, triangular ; 

 gula membraneous, indistinct; mouth parts small. Labrum tri- 

 angular with truncate apex, anterior edge fringed with chitinous 

 hairs. Mandibles broad across basal three-fourths, apical fourth 

 narrow, acute, entire. Labium transverse with mentum and sub- 

 mentum fused, indistinct, anterior edge arcuate. Maxilla fused 

 with labium to near apex, lacinia simple fringed with chitinous 

 hairs on inner distal surface; maxillary palpi two- jointed. Tho- 

 racic shield transverse, covering most of prothoracic dorsum. 

 Mesothorax and metathorax wider than all other segments. Sides 

 of thoracic and abdominal segments produced laterally. True legs 

 absent. Cerci absent. Anal segment wart-like. Body hairs short 

 and sparse, more apparent laterally. 



Pupa. Length about 2.6 mm. Oval, white to brownish black. 

 Posterior dorsal portion of prothorax bearing prominent chitinized 

 hairs, a transverse row of ten arising from dark, tuberculate bases, 

 five on either side of middle. Dorsal posterior portion of abdomen 

 terminated by a pair of upward -directed, stocky tubercles, tipped 



