THE CANADIAN ENTOMOLOGIST. 285 



As is generally known, each female lays from 150 to 200 eggs. These 



eggs are enclosed in a waxy secretion, produced by hypodermal glands. 



These glands are situated on the ventral surface of the abdominal segments. 



The first nymphs appear in from 10 to iS days after the commencement of 



the egg-sac. Only a small number of those hatched from a single egg-sac 



are males. The young nymphs on hatching remain a short time within the 



egg-sac, and, on leaving it, spread rapidly over the leaf, settling in large 



numbers along the mid-rib and at the joints of the stems. As previously 



pointed out, it is impossible to separate the males from the females during 



this stage. 



First Nymphal Stage. 



At time of hatching, the young nymphs are about .4 mm. long, and 

 from .18 mm. to .21 mm. wide, bright yellow to orange in colour, oval in 

 outline, slightly narrowed at the caudal end and rounded at the cephalic 

 end. The appendages look large and clumsy in comparison with the size 

 of the body. 



The abdomen is distinctly divided into eight segments, the transverse 

 sutures being distinct on both dorsal and ventral surfaces. The divisions 

 of the thorax are not so distinct. The transverse sutures cannot be 

 distinguished on the venter, and only with difficulty on the dorsum. The 

 suture separating the head from the thorax can be seen only on the dorsal 

 surface. 



The antennse are about .76 mm. long, situated on the ventral surface 

 of the anterior end of the body. The bases of the antennae are not 

 contiguous, and small hairs are scattered over their entire surface. They 

 are divided into seven segments. The basal one is triangular in outline 

 and quite short. The seventh segment is the longest, longer than the 

 three preceding segments taken together, oval in shape, and ends in an 

 apical tubercle, upon which is inserted a stiff hair, almost as long as the 

 segment itself. 



The cornea of the eyes projects from the sides of the head. The 

 black pigment is well developed, showing prominently on the ventral 

 surface. 



The legs are well developed and strong, especially when compared 

 with their condition in the adult. 



Second Nymphal Stage. 



The first moult occurs from ro to 22 days after hatching. It is Just 

 before this moult that Berlese could distinguish the males from the females 

 by the absence of developing mouth-parts. 



