I04 



ECONOMIC ENTOMOLOGY 



Several injurious species of cockroaches occur: (i) American 

 Cockroach, (2) Austrahan cockroach, (3) Oriental cockroach, and (4) 

 German cockroach or Croton Bug. 



I. American Cockroach {Periplaneta americanaL.), a native species, 

 is a large dark brown insect i)-2 inches long, with well-developed wings 

 in both sexes, 13^^-2 inches long; thorax with an obscure yellow border. 

 Eggs held within a capsule until hatched. Duration of life-cycle 

 about a year. Nocturnal. 



Fig. 59. — The oriental roach {Blalla orienlalis): a, female; b, male. All 

 natural size. {After Marlalt, U. S. Bur. Ent.) 



2. Australian Cockroach (Feriplanela australasia L.), ij^ inches 

 long; resembles preceding but the yellow band on thorax is much 

 brighter and more definitely limited. Upper wings have a dash of 

 yellow on each side. Abundant in the south. 



3. Oriental Cockroach {Blatta orientalis Fol.) or "black beetle," 

 is a nearly wingless dark brown or black robust form, about an inch 

 long— the male with wing cases one-half to three-fourths length of 

 abdomen; female wingless. Notably gregarious and larger than the 

 Croton Bug (Fig. 59). 



