THE COCCIDAE OF SOUTHWESTERN UNITED STATES 



61 



much less prominent than the first, bilobed and with the inner lobule 

 notched at the tip. Mesal pair with a spine near the inner basal 

 angle; second pair with a spine at the base of the inner lobule. Margin 

 of the pygidium more or less heavily chitinized between the two pairs of 

 lobes. Between the first and second pairs is a single large plate or gland 

 spine ; 'between the second and the position of the third is another such 

 plate and beyond the position of the third pair of lobes are two more, wide 

 apart. Marginal tubular ducts much larger than those of the dorsum 



Fig. 33. Lepidosaphes concolor Ckll. : pygidium of topotype specimen. 



and with their pores surrounded by conspicuous, chitinized rims. The 

 arrangement of these ducts may best be shown by the figure. On the 

 ventral side the spines are very small. Circumgenital pores in five 

 groups, the number of pores in each group small, four to eight. 



Notes: The description of the genus Aonidomytilus, of which this species 

 is the type, is not available and I do not know by what the genus is supposed to 

 be distinguished. Aside from the color of the scale I see no character which may 

 separate this species generically from L. ulmi. In fact, a direct comparison of 

 the two species shows that they are morphologically very similar. In my opinion 

 the genus Aonidomytilus can not be maintained. 



