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A CONTRIBUTION TO THE KNOWLEDGE OF 



lobes are two very small plates and just beyond the second lobe are two 

 more, these slightly branched. Dorsal pores for the most part arranged 

 in four rows which are set in more or less definite furrows as indicated 



Fig. 37. Aspidiotus graminellus Ckll. (?) : pygidium. 



in the figure. Ducts slender, moderately long. Ventral side with a few 

 pores which possibly are the orifices of tubular ducts. Circumgenital 

 pores lacking. 



Notes : This is possibly not A. graminellus, as Cockerell speaks of three 

 pairs of lobes and of thickenings at the bases of the lobes, but it is certainly rather 

 close to that species, at least. It is not Targionia marlatti (Par.), a slide of which 

 I have seen through the kindness of Professor G. A. Dean of the Kansas State 

 Agricultural College. 



As is the case with other species now referred to the genus Targionia it is 

 questionable that this belongs to that genus and I am for the present leaving it in 

 Aspidiotus. 



Genus CHRYSOMPHALUS Ashmead. 



Chrysomphalus covilleae n. sp. 



Fig. 38. 



Type host and locality. From Covillea glutinosa, Mormon Flat, 

 east of Phoenix, Ariz. Found on the bark and in cracks on exposed 

 roots. 



