420 THE CANADIAN ENTOMOLOGIST 



elongated in an oval shape and a little arcuated. At one end of 

 the cluster the gelatinous structure extends into a handle-like 

 projection which is supposed the last portion of the egg-mass. 

 Usually this cord is found to be much twisted and coiled. The 

 unfertilized eggs remain undeveloped (PI. XXI, fig. 1). 



It was often noted that, before the fertilized eggs begin to 

 develop, 3 or 4 of them in the cluster w^ere attacked by fungus. 

 The fungous filaments growing on them look like the tentacles of 

 hydra and sometimes become extremely elongated, branching out 

 to connect other eggs nearby in the gelatinous mass. They re- 

 semble a network, but are irregularly arranged. This growth 

 checks the development of the eggs and destroys all the substance 

 of them. The fungous disease generally starts from one or two 

 eggs, gradually affecting more eggs and finally destroying the whole 

 mass. 



Larva. — When newly hatched, the pale, gray larva measures 

 .8 mm. in length, with its head disproportionally large." The 

 anterior and anal prolegs are short and stout, the claws of the lat- 

 ter pale and transparent. The body segments are not distinct. 

 At this stage there are no appendages at all on the ventral sur- 

 face of the eleventh segment, while on the caudal end of the twelfth 

 segment there are but two gills. A median tuft of hairs occurs 

 on the dorso-caudal portion of the twelfth segment (Fig. 4). 



Later when the larva has attained the size of 1 to 1.5 mm. 

 in length the head is more or less reduced in proportion, the body 

 segments are more distinct and two more blood gills have grown 

 out on the last segment. 



When 3 mm. in length, the larva has assumed the general 

 form of a fully grown individual. The body is now much larger 

 in proportion to the head ; the mandibles are slightly blackened 

 at their tips, the eye-spots are black instead of red and the head 

 darker. The curved hairs and claws on the prolegs are well de- 

 veloped and more distinct. One of the most noticeable changes 

 in the young larva now is that the blood gills on the ventral sur- 

 face of the eleventh segment are just budding out. The colour 

 of the larva has now become pink. 



The colour of the larva becomes red when it is about 5 mm. 

 long. Excepting for the short gills curled together on the eleventh 



