258 Phylum Art hr op oda 



Newly hatched nymphs are active, moving about from one surface of 

 the leaf to the other. From 1 to 3 days after hatching they become quies- 

 cent and cast their skins. The second instar nymphs feed actively on 

 the upper and lower surfaces of the leaves. The entire life cycle is 

 completed in 18 to 21 days, averaging 18% during the summer months 

 when temperatures are fairly high and humidity low. Females have lived 

 as long as 6 weeks during the summer, while others have laid their full 

 complement of eggs and died within 2 weeks after emerging. 



Copulation takes place soon after the female emerges from the third 

 instar skin. In several instances the male was observed standing over 

 a quiescent third instar mite even before she had begun exit from the 

 skin. Later work showed that fertilization may take place during this 

 time. Oviposition usually takes place % to % of an hour after fertiliza- 

 tion. One egg is deposited at a time and from 1 to 5 may be laid during 

 24 hours. 



Another method for rearing mites on plants having large leaves was 

 to cut small doughnuts of felt. Each of these was fastened to a leaf 

 with waterproof glue and covered with glass or cellophane which was 

 held in place by a paper clip. Fiber circles, such as those used in making 

 microscope slides, were also used with excellent results. A mite working 

 on Rhododendron was reared through two seasons under these conditions. 



Class Myriapoda y Order diplopoda 



EURYURUS ERYTHROPYGUS* 



THIS millipede is abundant in the heartwood of much decayed logs, 

 in moist and more decayed sapwood, and on the soil under decaying 

 wood if rather moist conditions prevail. 



Specimens were collected and placed in glass receptacles approximately 

 5% inches in diameter and about 3 inches deep. These were half-filled 

 with small, broken pieces of moist and much decayed sapwood from 

 a rotten log, together with a little humus. This material was examined 

 carefully for contaminating forms, such as other millipedes, centipedes, 

 mites, earthworms, eggs, insects, etc. A layer of vaseline was spread 

 around the rims of the receptacles and glass covers placed over them, 

 thus insuring very little if any evaporation. However, a few drops of 

 water were added occasionally. Moisture and other conditions were kept 

 as natural as possible. Some of the receptacles were opened for observa- 

 tions every day and fresh air entered at these times, but the animals 

 seemed to thrive in receptacles which were not opened so often. 



* Abstracted from an article in the Ohio J. Sci. 27:25, 1927, by Hugh H. Miley, Ohio 



State University. 



