242 ENTOMOLOGICAL NEWS. [Oct 



plants than the two species of Phaius mentioned. Thus there 

 is reason to believe that it was imported with one or the 

 other of the original plants, which are natives of Japan, and 

 this would render the insect palrearctic in origin ; but, as is 

 sometimes the case with plant house-insects, the subject is 

 clouded in considerable obscurity. 



The plants seem able to thrive even when infested with 

 considerable numbers of the scale, though one plant has died 

 presumably as a result of infestation, though scales of another 

 sort, which were present, doubtless aided in bringing about 

 the result. 



One curious fact was noted, that while the female was as a 

 rule sedentary, at the same time up to the period of gestation 

 she was capable of free locomotion and was very apt to seek 

 for pastures new, especially if feeding was poor ; not always, 

 however, with very great success, as, for instance, when an 

 infested leaf was pinned up against the window casing numbers 

 of the insects left the leaf and actually made their ovisacs on 

 the wood work itself, sometimes at a distance of several inches 

 from the leaf. The ovisacs were appreciably smaller than 

 where the insects remained at rest, however, showing that the 

 secreting power of the glands is limited where fresh food is 

 not obtainable. I further noticed that as the ovisac grew in 

 size the insect was pushed forward, the ovisac itself remain- 

 ing stationary. 



Natural enemies : I bred a parasite from the scale, which 

 Dr. Howard kindly identified as Coccopliagus lecanii Fitch, a 

 form which infests many of our local Goccidce. 



An artificial remedy was discovered to be very effectual 

 through an oversight. The student in charge of the insectary 

 green -houses wherein the insect was being bred was instructed 

 to fumigate the houses with tobacco smoke, which he did 

 without removing the Phaiits plants, to the utter destruction 

 of every specimen of the scale. 



DESCRIPTION OF PLATE 



Figure 1, Newly hatched larva. 

 Figure 2, Male pupa within test. 

 Figure 8. Female, nearly mature. 

 Figure 4, Female with fully formed ovisac. 

 Figure 7, Female antenna, type " A." 

 Figure 8, Female antenna, type " B." 

 Figure 9, Male antenna. 



Figure 10, Fore leg of femalei lOa, claw enlarged 

 Figure 11, Anogenital structure of female. 



Figure 12, Stigma and stigmatal glands and spines, "a" equals "a "en- 

 larged . 



Figure 18, Female mouth 



14, Margin of female scale showing branched spines. 



