190 ENTOMOLOGICAL NEWS [XXXI, '20 



thorax, giving her a most vicious expression. When near 

 enough she makes a quick spring and seldom misses. All 

 these observations were made on individuals in captivity. 

 Without doubt the same method is used in the open, her 

 resemblance to an ant perhaps making approach more easy. 

 In a number of instances these adults have been seen to feed 

 on jassids after capture, sinking their jaws into the thorax 

 of the captive and devouring ravenously, killing it in the 

 operation. 



From an economic standpoint this species must be regarded 

 as distinctly beneficial although as a control measure it can 

 be of little real value since it normally occurs in very limited 

 numbers. 



Oviposition by a Cockroach, Periplaneta 

 americana Linn.* (Orth.). 



By V. R. Haber, Research Assistant in Entomology, Univer- 

 sity of Minnesota. 



Little detailed information concerning the egg placing 

 habits of our common cockroaches is recorded. For this 

 reason it seems desirable to record these observations made 

 upon the oviposition habits of the American cockroach, 

 Periplaneta americana Linn. 



As is characteristic of most of the species of cockroaches 

 or Blattidae, Periplaneta americana Linn, is nocturnal. Thus 

 it was necessary to continue observations during the entire 

 night. 



A cage was provided in which to confine the roaches during 

 observation. It consisted of a wide mouthed candy jar of 

 about two gallons capacity. Inside upon its bottom rested 

 small slabs of corrugated pasteboard, each leaned slantwise 

 against the wall of the cage. During observation the cock- 

 roaches were fed with freshly killed individuals of the same 

 species, bread and water. 



*Published with the approval of the Director as Paper No. 200. of the 

 Journal series of the Minnesota Agricultural Experiment Station. 



