176 ENTOMOLOGICAL NEWS [June, '22 



mealy bug was usually left to shift fur itself. The latter does 

 not produce honey dew as profusely as the former. 



When disturbed or handled rather roughly both species would 

 eject from one to four dorsal globules over the location of the 

 dorsal ostioles. When the ants touched these liquid globules 

 they were invariably repelled while at the same time the anal 

 secretion of honey dew was always eagerly accepted. As a 

 rule honey dew was ejected in response to a gentle stroke of a 

 stiff hair or' needle, but when the treatment became too severe 

 the dorsal globules were suddenly ejected, the ostiole nearest ttvj 

 point of disturbance being the first to respond. 



REFERENCES. 

 CLAUSEN, C. B. 1915. The Mealy Bugs of Citrus Trees. Univ. of 



Cal. Exp. Sta. Bull. 238, pp. 26-30. 

 D.wis, G. E. 1804. Mealy Bugs and Their Allies. Insect Life 7: 



171-173. 

 1804. Insects That Are Common But Xot Destructive. Mich. 



Agric. Exp. Sta. Bull. 116, pp. 58-60. 

 FERRIS, G. F. 1918. (a) The California Species of Mealy Bugs. 



Stanford Univ. Publication, Univ. Series, pp. 48-40. 

 1918. (b) The Alleged Occurrence of a Seasonal Dimorphism in 

 the Females of Certain Species of Mealy Bugs. Entomological 

 News, 20:349-352. 



1910. Observations on Some Mealy Bugs. Jour. Econ Ent. 12:293. 



1921. Report of a Collection of Coccidae from Lower California. 



Stanford Univ. Publication, Biological Sciences, 1. No. 2, p. 83. 



Insects of the Yellow Thistle (Hem., Col., Lepid., 



Dip., Hym.). 



By O. W. ROSEWALL, Louisiana State University. 



Baton Rouge, La. 



Practically throughout the entire state of Louisiana one can 

 find the plants of the Yellow Thistle (Caniitits spinosissiimis 

 Walt..) growing at some time during the year, and in the south- 

 ern part of the state the prickly green leaves may be found 

 during the whole year, except when heavy frosts destroy them. 

 In the spring, during the flowering season, the}- are very notice- 

 able, especially in pastures and along the roadside where they 

 stand as sentinels because the cattle have eaten the surrounding 



