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A CONTRIBUTION TO THE KNOWLEDGE OF 



Female. Of the ordinary form; derm of cephalothorax but little 

 chitinized. Pygidium with the median lobes alone well developed, the 

 second and third pairs obsolete, their position indicated merely by the 

 spines at their bases. Median lobes rather large, straight, parallel, with 

 their outer margins notched near the tip. Between the median lobes is 

 a pair of small plates and beyond the lobes is a continuous series of slen- 

 der, toothed or slightly branched plates, ten or more in number. Spines 

 rather long. First poriferous furrow (incision) with but four to five 

 pores, second with but two to three; dorsal pores few; ducts communi- 

 cating with the pores moderately long and slender. The arrangement of 

 the pores can best be described by the figure. Thickenings at the mar- 

 gins of the first poriferous furrow rather large, that of the mesal margin 

 longest; thickenings of the second furrow inconspicuous. Anal opening 

 only a short distance from the margin. Circumgenital pores in four 

 groups, these more or less confluent and with but few pores, which are 

 disposed along a thickening. 



Notes: As Cockerell has indicated, this species is quite similar to A. lataniae, 

 but the larger number of plates alone is sufficient to distinguish it. 



Aspidiotus covilleae n. sp. 

 Fig. 36. 



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

 east of Phoenix, Ariz. Occurring beneath the loose bark on exposed 

 roots in company with Chrysotnphalus covilleae n. sp. 



Fig. 36. Aspidiotus covilleae n. sp. : pygidium. 



