186 



THE CANADIAN ENTOMOLOGIST. 



the abdomen. The head and thorax are slowly worked up out of the 

 shell until the legs can be of some assistance in pulling, after which the 

 rest of the process is relatively easy and rapid. The length of time 

 required to emerge after the central area of the shell has been completely 

 removed varies from thirty minutes to one hour, after which the larva 

 immediately starts off in search of food. 



The larvae were placed upon tender apple leaves, and commenced 

 feeding at once. A slight jar caused many of them to spin down from 

 the twig to the table, where they showed a decided tendency to travel 

 toward the light. 



Neivly-hatched Larva (Plate 4, Fig. 2). — Length at rest, 1.5 mm.; 

 width of head, .33 mm.; average diameter of body, .25 mm. Head large, 

 rounded, nearly as wide as high, of a uniform yellow colour, darker than 

 rest of body ; clypeus triangular, marked by brown sutures ; mandibles 

 tipped with black. Head sparsely clothed with comparatively long, 

 white hairs having blunt extremities; antennas comparatively long ; head 

 free, erect. Body nearly cylindrical, tapering very slightly posteriorly 

 from head ; annulations not very distinct ; segments somewhat shorter 

 than their diameter ; prolegs present on abdominal segments 7 and 10, 

 with vestiges of a pair upon sixth abdominal segment. Cervical shield 

 prominent, of same colour as head, and with a light yellow border, which 

 is set with ten spines (Fig. 7 A). Arrangement of the tubercles, as 



Fig 7.— Arrangement of tubercles and spines upon the larva of Anisopteryx pometaria, Harr., first 

 instar. A : cervical shield on dorsum of prothorax ; A. anterior side; P. posterior side. 

 B : metathoracic and first abdominal segments ; I.-VIL, tubercles and spines, according 

 to Dyar's classification ; s, spiracle. 



shown in Fig. 7 B, differs upon the thorax from that prevailing upon the 

 abdomen; tubercles on prothorax and 9th and 10th abdominal segments 



