132 KANSAS UNIVERSITY SCIENCE BULLETIN. 



be given to the technique. For this study the method used 

 was as follows : The insects removed from under the scale were 

 bleached in a strong solution of caustic potash, either by boil- 

 ing till sufficiently bleached, or by leaving them in the solution 

 from twelve to twenty-four hours. Great care must be exer- 

 cised that the bleaching process maybe carried just far enough 

 to show all the necessary characters in the pygidium, but not 

 so far that the insect becomes quite transparent, or there will 

 be great danger of losing it during the process of transferring 

 from one solution to another. The mouth-parts retain color 

 longest, and often when the rest of the body is invisible to the 

 naked eye the presence of the insect can be detected by the 

 mouth-parts. After bleaching, the insects were washed twice 

 in distilled water, being left each time for about ten minutes, 

 then transferred to fifty per cent, alcohol for about fifteen min- 

 utes, then to ninety-five per cent, alcohol for about the same 

 length of time. Since these insects are very difficult to trans- 

 fer from one liquid to another without danger of maceration 

 and great loss of time and energy, it was found best after re- 

 moving them from the caustic potash to leave them in the same 

 Tessel, changing the liquid by means of a pipette. They were 

 next transferred into a drop of clearing mixture* on a slide 

 and left thus for fifteen minutes or longer, then a drop of xylol- 

 balsam was added and the mount completed. 



The materials used for this study were furnished by Professor 

 Hunter, the head of the department, and the writer wishes to 

 thank him for his direction and kindly assistance, to which this 

 paper is largely due. The illustrations were all made by the 

 writer with the use of the camera lucida. 



PARLATORIA Targ. 



DESCRIPTION OP GENUS. 



The following description of the genus Parlatoria is given as 

 gathered from the descriptions of Signoret ( 1868) , Comstock 

 ( 1881 ) , Newstead ( 1901 ) , and Green ( 1899 ) , together with 

 personal observations. 



Scale of Female. — The female scale may vary from circu- 



*This cloarinsr mixture was composed of two parts, by measure, of carbolic-acid crystals 

 and three parts of rectified oil of turpentine. 



