410 
Mr. 0. H. Latter on the secretion of 
SUMMAET. 
i. Imagines of D. vinula, furcula^ hifida, B. callunce, lanestriSy 
S. carpini, L. testudo, and H. prasinana secrete from the 
mouth an alkaline fluid on emerging from the pupa. 
ii. The Dicranuran species wear a " shield " derived from the 
pupa case as they emerge, and remove it subsequently by 
their legs. 
iii. The strength of the solution in D, vinula is about 1*4 
grammes of potassium hydroxide in every 100 c.c. of 
liquid. 
iv. The mesenteron of D. vinida developes an anterior dorsal 
diverticulum for storage of the alkali during pupal 
life. 
v. The palps of D. furcula and bifida are the boring tools used 
to open the cocoon. 
vi. In B. callunce, lanestris, and L. testudo, the front of the head 
either of the pupa or imago is produced into a sharp boss 
for perforating the cocoon. 
vii. Small articulated (?) mandibles with muscle slips are present 
at the corners of the labrum of H. prasinana. 
