^S JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 2 



28. Aspidiotus perniciosvs Comst., injuriously abundant on Cornus, rose 



and willow, Forest Home Cemetery, Milwaukee. August 18, 1908. 



29. Aspidiotus tilmi Johns., on elm, July 21, 1908. 



30. ^Aspidiotus, cross between juglatis-regice Comst. and ostrewformis Curt, 



injuriously abundant on trembling aspen and willow, July 9, 1908. 



31. *Chrysomphalus aonidiini (Linn.), on oleander, orange and palms. 



32. *Chrysomphal'Us aurantii (Mask.), found on oranges in the Milwaukee 



markets. 



33. *Chrysomplialus dictyospenni (Morg.), on Cycas and palms. 



34. Chrysomphalus ohsctirus (Comst), on oak, July 29, 1908. 



35. * Chrysomphalus persew (Comst.), found on holly in the Milwaukee 



markets. 



36. *Lepidosaphes beckii (Newm.), found on lemons and oranges in the Mil- 



waukee markets. 



37. Lepidosaphes ulmi (Linn.), injuriously abundant on apple, pear and wil- 



low; also found on Cornus, currant, hawthorn and linden. July 8, 1908. 



38. *Ischnaspis longirostris (Sign.), on palms. 



'Specimens of this scale were sent to Dr. C. L. Marlatt with a note calling 

 to his attention the fact that while the insect which we were sending him re- 

 sembled to some extent Aspidiotus ostreirformis Curt, and Aspidiotus jug- 

 lans-regiw Comst., it was radically different from either in many characters. 

 The following is offered as an explanation for the resemblance which this 

 insect bears to the two above-mentioned species of Aspidiotus by Marlatt 

 and is quoted verbatim from a letter received from him: 



"In my manuscript revision of the genus Aspidiotus I have designated this 

 form as a cross between juglaiis-rcfiicc Comst. and ostrewfonnis Curt. The 

 former is the American representative of ostrarforniis. and has developed 

 into a fairly distinct species, differing in notable structural features from 

 its European ally. These crosses have appeared in situations where both 

 species occur, and the reproduction of certain of the structural features of 

 each is such as to make the evidence of crossing very complete and con- 

 firms the belief in the not very remote separation of the two species named 

 from a common ancestor. This form, which I believe to be cross bred, 

 bears strongest resemblance to ostrefcformis, but approaches juglaiis-regicB 

 in size and in the dorsal pores and in the character of the terminal lobes. 

 The chitinous paraphyses or chitinous thickenings at the base of the lobes 

 are practically as in ostrewformis. The paragenitals also approach more 

 nearly juglans-regiw." 



Entomological Laboratory, Ohio ^tate University. 



