1915] Lyon— Notes on the Cat Flea 127 



D ec r/g-n- 7eb iTlar Qhr Pla'^ J<-c July ^u j B^M Oct TlOU 



Table 2. Seasonal Abundance of the Cat Flea {Ctenocephalus felis) . 



Econ., Ent., Vol. 5, p. 314 (1912) were led to disregard fleas for 

 this reason. The present data show, however, that in a climate 

 like that of New England the seasonal prevalence of these insects 

 agrees, in some respects at least, quite well with the seasonal inci- 

 dence of the disease. The relationship which exists is shown graph- 

 ically in the following tables (Tables I and II), in which are 

 observed the abundance of the cat flea and the reported incidence 

 of poliomyelitis. The data concerning the disease have been 

 collected from a number of sources and relate to several states so 

 as to minimize, as far as possible, any irregularities which might 

 arise from the small numbers of cases reported during the winter 

 months. 



In the reports of the Massachusetts State Board of Health on 

 Infantile Paralysis for the years 1907-1912, we find the following 



