Table for Identification of Fleas 



563 



TABLE FOR THE IDENTIFICATION OF THE FLEAS CONCERNED IN 

 PLAGUE TRANSMISSION 



Family PULICID^. 

 Subfamily P ULICIN&. 

 All have eyes. 



A. Have no combs or spines on 

 head, thorax or abdomen. 



a. The meso-sternite is narrow 

 and has no rod-like incrassa- 

 tion from the insertion of the 

 coxa upward Pulex. 



b. The meso-sternite has a rod- 

 like incrassation from the 

 insertion of the coxa up- 

 ward Xenopsylla. 



B. With combs. 



c. Combs on the prothorax 



only Ceratophyllus. 



d. Combs on the prothorax and 

 on the gena or lower margin 

 of the face Ctenocephalus. 



OTHER MICRO-ORGANISMS OF THE PLAGUE GROUP 



The Bacillus pestis is a member of a group of organisms col- 

 lectively known as the bacilli of hemorrhagic septicemia. Two of 

 these organisms are of sufficient interest to deserve special mention. 



