SCALE INSECTS OF IMPORTANCE 35I 



Aspidiotus ancylus Putnam 



PLATE II, FIGURE 2 AND PLATE 15, FIGURE I 



This species possesses in general but a single pair of lobes, the median 

 ones, which vary considerably in length and outHney but in a fresh adult 

 female they are usually quite long and nearly straight on the inner and 

 outer margins, with the tips rounded and notched on the outer edge, and 

 often also on the inner edge near the tip. Reference to the figures will 

 explain this statement When worn by long and rough use, the lobes 

 may be much shorter and worn to an oblique curve instead of the form 

 above described. They sometimes approximate slightly at the tips. 

 Occasionally rudiments of other lobes can be made out. 



Spines are as usual. Plates are quite numerous fringing the segment; 

 two or three occur at each incision. Comstock speaks of them as usually 

 simple, but they are at least frequently toothed in the mounts I have 

 examined. There are three to four or five irregular and usually simple 

 and slender plates between the third and fourth pairs of spines. The 

 incisions are wide and not deep. 



The chitinous processes at the incisions are variable, being often quite 

 large. The one on the inner margin of the first incision is frequently 

 much larger than the opposite one, but they may be subequal. They are 

 of the straighter type, resembling A. ostreaeformis in this rather 

 than A. perniciosus and A. forbesi. The median ones are 

 usually quite large and prominent, but straight. 



The ventral glands are in four or five groups : the anterior ones are 

 0-6, the anterior laterals 6-14, the posterior laterals, 5-8. These 

 numbers are on Comstock's authority. The glands show usually a some- 

 what linear or scattering arrangement not the compact circular appear- 

 ance of typical A. ostreaeformis. The ventral thickenings are 

 usually vague and irregular. The anus does not differ strikingly from 

 A. ostreaeformis. 



The dorsal pores present quite a range of variation. Dr Marlatt 

 informs me that they are typically much fewer than in A ostreaeformis 

 or A. juglans-regiae. The office collection shows many specimens, 

 however, where they are abundant, appearing usually in three or even 

 four well defined rows. On each side of the median line one row ex- 

 tends from the second incision toward the lateral transverse thickening^ 

 another laterad of this extends clear to the outer margin of the same 

 thickening and there is still another, though shorter one, outside of this^ 

 while a group of three or a line of four or five appears at the first incision. 



