SYMPHYPLEONA 229 



Anurida marUima occurs abundantly on the seashore, chiefly between 

 tide marks; several important embryological and anatomical mono- 

 graphs have been published regarding this species. Podiira aqiiatica 

 is one of the most abundant members of the Collembola; it occurs 

 on the surface of standing water on the margins of ponds and streams. 



Family 2, Entomobryidae. Furcula present and apparently 

 appended to the fifth abdominal segment; prothorax reduced and 

 cuticula not granulated. 



This is the largest family of the Collembola, containing many 

 genera and species. In some genera the body is clothed with scales. 

 To this family belongs the genus Orchesella, the only genus in the 

 Collembola in which the antennae consist of six segments. 



Suborder II. SYMPHYPLEONA* 



Body shortened, sitbglobniar in shape with segments of body, except 

 the last two, fused closely together and segmentation mostly obliterated; 

 trachecB present in some genera. 



Family 3, Neelidae. Antennae short 

 and stout; thorax large and longer than 

 abdomen. The principal genera are 

 Neehis and Ne elides. 



Family 4, Sminthuridae. Antennse 

 long and slender; thorax shorter than 

 abdomen. The principal genera Smin- 

 thurus and Papirius. 



In Sminthurns, trachea are present; in Fig. 236. — Papirius fuscus- 

 the other genera they are absent or ex- (After Lubbock.) 

 tremely vestigial. The presence of tra- 

 cheae in Sminthurns enables these insects to live in drier situations 

 than can other Collembola. The " garden-^ea" S^mnthiirus hortensis 

 is found upon the leaves of young cabbage, turnip, cucumber, and 

 various other plants. 



*Symphypleona ; symphyo, to grow together; pleon, a crustacean's ab- 

 domen. 



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