SB 

 818 

 C578 

 ENT 



No. 51, SECOND Series. 



lited States Department of Ao-riculture, 



DIVISION OF ENTOMOLOGY, 



L. O. HOWARD, Entomologist. 



COCKROACHES. 



By C. L. Marlatt, 

 First Assistant Erdoinoloyist. 



[Revised reprint from Bulletin No. 4, New Series, Division of Entomology, U. S. Department of 



Agriculture, pp. 84-9.').] 



Roaches are among the commonest and most offensive of the insects 

 which frequent human habitations. They were well known to the 

 ancients, who called them lucifuga, from their habit of always 

 shunning the light. The common English name for them, or, more 

 properly, for the common domestic English species, is "black beetle." 

 In America this name has not been adopted to any extent for this 



Fig. 1. — The American roach [I'criijlaiicta amcricaiia): «, view from above; /», from beneath— 

 both enlarged one-third (original). 



insect, which was early introduced here, and the term "roach," or 

 "cockroach," is the common appellation of all the domestic species. 

 The little German roach, however, is very generally known as the 

 Croton bug, or n-ater bug, from its early association with the Croton 

 waterworks system in New York City. The popular designations 



