incision between second and third lobes similar; a very small 

 incision in anal margin laterad of second incision at a dis- 

 tance slightly exceeding width of second lobe. A small 

 chitinous process on interior base median lobe, sometimes a 

 very small one on exterior base median lobe; a well defined 

 chitinous process mesad of first incision and adjoining the 

 latter, a slightly smaller one on exterior edge of same; small 

 chitinous process on interior edge of second incision, outside 

 edge of second incision with narrow chitinous margin. A 

 pair of spines just outside base of median lobe, not exceeding 

 median lobe in length, one member of the pair being situated 

 on dorsal side of the body and the other on the ventral; one 

 pair spines from each the second and third rudimentary lobes, 

 about equaling median lobe in length, one member of each pair 

 dorsally situated as in first pair; other spines, few in number 

 often on anal margin laterad of third lobe. Plates, simple, 

 di-pointed or with side prongs, located one pair each in first 

 and second incisions and one or two laterad of third lobe. 

 Median group of spinnerets usually four or five in number, 

 sometimes absent; caudolaterals, four to eight; cephalolaterals, 

 six to fourteen. 



In this as in most of the species the two halves of the 

 anal segment are rarely exactly alike, but the variation from 

 the specific character is not likely to be sufficient to cause 

 confusion. In the case of spines and plates that are variable 

 mention is not made, nor are they figured. 



This species has been taken at Ames, on birch, black 

 maple, plum and snowball. 



ASPiDioTUS ANCYLUS var. SERRATUS N. and Ckll. 



Newell and Ckll., Coccidao of Iowa by Osborn, la. Acad Sc, Vol. V, 

 p. 229, 



This variety presents a few well marked differences as 



