JOURNAL OF ENTOMOLOGY AND ZOOLOGY 143 



KEY TO THE FAMILIES, GENERA AND SPECIES OF 



COLLEMBOLA 



Key to the Order COLLEMBOLA 



A. Fiircula present. 



B. Furc'ula attached on the penultimate segment. 



C. Abdomen globular, little longer than broad; 

 segments fused together; scales never present; 

 claws two; antennae four-jointed; no post- 

 antennal organ. Family SMYNTHURID^ 



CC. Abdomen sub-cylindrical, longer than broad, 

 segments free ; scales present or absent ; claws 

 two. Family ENTOMOBRYID^ 



BB. Furcula attached to antepenultimate abdominal seg- 

 ment. Body sub-cylindrical, segments free; antennae 

 four- jointed ; claws two or one. 



Family PODURID^ 

 AA. Furcula wanting. Family APHORURID^ 



^to- 



Family SMYNTHURID^ 



There is little danger of confusing the members of this 

 family with those of any of the other families for the globular 

 abdomen and its fused condition easily distinguishes it. The 

 head is carried in a vertical position, the ventral tube is long 

 and well developed, ocelli sixteen. The majority of this group 

 are beautifully marked. 



I found fewer specimens of this family than of any of the 

 others and in fact I hunted for a year and a half before I 

 found any at all and then only a few specimens which have not 

 yet been determined. 



Key to the Family SMYNTRURID^ 



A. Antenna IV shorter than antenna III. The distal part 



of antenna III ringed. Genus Papirius 



B. Antenna IV longer than antenna III. Antenna III 



not ringed. Genus Smynthurus 



