HOW TO KNOW THE IMMATURE INSECTS 



ORDER COLLEMBOLA 



la. Body more or less cylindrical and elongate; abdomen plainly 

 segmented (Suborder Arthropleona) 2 



lb. Abdomen subglobular, segmentation obliterated or vestigial. 



(Suborder Symphypleona) 3 



2a. Prothorax well developed, with a definite tergum; cuticle usually 

 granulated. Fig. 119 Family PODURIDAE 



These are the springtails and snow- 

 fleas including about 315 species. The 

 young live a secluded life and are of- 

 ten white or colorless. The snowflea, 



, , ^ ^ . ^ AchoTutes nivicolus Fitch is a widely 



Fig. 119. Achorutes ormotus i. . ., ^ i i • i tx 



Nicolet. distributed species which often occurs 



on the surface of snow. 



2b. Prothorax greatly reduced, without a tergum; cuticle not granu- 

 lated. Fig. 120 Family ENTOMOBRYIDAE 



Fig. 120. Entomobrya laguna 

 Bacon. 



There are some 600 described spe- 

 cies. The marsh springtail, Isotoma 

 palustris (MuUer), is a widely distri- 

 buted species. It may be found in 

 wet leaves, moss and soil and often 

 appears on the surface of fresh 

 water pools. 



3a. Antennae stout, not longer than head; thorax very large. 



Fig. 121 Family NEELIDAE 



THORAX 



AA^re/^/^ 



Fig. 121. Neelides folsomi. 



A small family composed of 4 spe- 

 cies. They are globular and bristly 

 with very short antennae inserted on 

 the middle of front of the head, with 

 eyes present or absent and with the 

 furcula about twice the length of the 

 antennae. They may be found under 

 dead bark and in decaying vegetation. 



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