298 NEW YORK STATE MUSEUM 
are imbedded in the tissue of the plant. Scars showing where 
other larvae have been feeding are representd at e and on plate 
28, figure le. Several nearly mature larvae are shown on- 
plate 222 attached to the underground stems. As the stem 
elongates, new leaf stalks are formed at the growing end. 
The bases of two of these are shown on plate 227. Just back of 
these will be noted a number of rough, pitted, ovate areas 
[pl.22y], the leaf scars, the places where leaf stalks were 
formerly attached. On many of these scars will be seen ovate, 
cylindrical bodies [pl.220], which are the cocoons. The co- 
coons are spun by the larvae from silk secreted by glands that 
open in the mouth. When the cocoons are opened, larvae, 
prepupae, pupae, just transformed adults, or mature adults may 
be found at the same time. On plate 22a are shown three co- 
coons from which adults have emerged. 
The larvae are opaque white or slightly yellowish in color 
and scarabaeoid in form. The head [pl.28, fig.1] is minute 
and frequently almost concealed by the pronotum. The 
eyes are present in palmata, though they are apparently 
wanting in some other species. The labrum [pl.25, fig.6] is 
minute and usually four sided; projecting from its distal mar- 
gin are a number of setae, the marginal setae [fig.6mq} which 
are attached to its ental surface; its disk bears six long setae 
arranged in pairs, a distal pair [fig.6ds], a median pair [fig.6md ] 
and a proximal pair [fig.6px%]; laterad of the discal setae 
there is on either side a single long lateral seta [fig.6ls], and 
near the discal setae there are one or two pairs of pitlike open- 
ings, the sensory spots [fig.6sn]. The thoracic segments are 
rotund, with six short, hooked legs. The abdomen is composed 
of 10 segments, seven of which are well developed, but the last 
three are minute and curved beneath the sixth and seventh. 
There seems to be considerable disagreement as to the number 
of segments that are present. Perris! considers all that portion 
beyond the seventh [pl.27, fig. 17 and 19] as one segment, 
Heeger that it is made up of two segments, while Schmidt- 
Schwedt? and Sanderson® consider this portion to be made up 
1Perris, E. Histoire des Metamorphoses de la Donacia sagit- 
tariae. Ann. Soc. Ent. Fr. (2) 1848. 6:33-48, pl.2, no. 2. 
*Schmidt-Schwedt, E. Noch einmal tiber der Athmung der Laryen von 
Donacia crassipes. Berl. Ent. Zeit. 1889. 33:299. 
“Sanderson, E. D. The larvae of Donacia piscatrix Lac., and 
crassipes Fab. Can. Ent. 1900. 32:252. 
