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Annals Entomological Society of America  [Vol. XIV, 
from the cocoons of these species seen at the Museum of Com- 
parative Zoology, Cambridge, Mass. All three instars have 
these packets, which are constructed anew after each molt. 
The morphology of the larve is considerably modified and 
specialized for carrying the packet. The abdomen is much 
shorter, but broader and thicker than in the naked larve, 
causing it to be arched conspicuously from the first to about 
the seventh segment. The lateral abdominal tubercles are 
rather small, fleshy lobes without clearly defined stalks and the 
setze are likewise short. The dorsal sete are present and fairly 
prominent. In the Kansas species there has been observed 
one to three rows of microscopic hooked setz on each abdominal 
segment from one to six, inclusive. There are six in the shortest 
rows and about thirty in the longest’ rows. The tips are bent 
downwards and serve to hold the packet in place. It has been 
usually stated that there is a gelatinous substance on the sete 
holding the debris in place. The writer has not found such a 
secretion, but would explain the firm security of the packet 
on the dorsum as due to these hooked setz, assisted by the 
larger dorsal and lateral seta. The thoracic tubercles have 
stalks much longer than is the case 1n the naked larve, and the 
sete on the first two pairs extend outward in a fan-shaped 
manner, turning upward at the tips. This provides an even 
and ‘firm (“support for. the ‘anterior mm or the packets All 
four of the packet bearers seen are somber gray larve, with 
little of a color pattern. All but C. bimaculata have the two 
pairs of dorsal head bands and in the last instar have posterior 
spots which suggest a third pair. 
The first instar of all Chrysopid larve can be distinguished 
by the presence of two large setz on each lateral tubercle except 
the mesothoracic and metathoracic tubercles, which bear three 
each. The dorsal head spot in the first instar of C. chi, C. 
oculata, and the varieties of each, breaks up into three spots in 
the. third instar. In C. nigricornis there are three spots of 
the same pattern as in the preceding on the dorsum of the head 
in all instars. 
THE Pura. 
Grown larve normally spin silken cocoons in which to trans- 
form. The silk is produced by modified malpighian tubules and 
is spun through the anus. Some larvee fail to spin a cocoon, a 
