EXPERIMENT STATION BULLETINS. 



243 



The following description of the adult female is taken with a few corrections, from the 

 writer's account of this insect on clover in the Canadian Entomologist of October, 1899: 



The adult female measures a little more than two millimetres in length, is reddish- 

 brown in color, covered with a coating of waxy or mealy secretion. The legs are dirty 

 yellow in color. From the sides project from 15 to 17 (usually 17) waxy processes, 

 forming a fringe around the body in the usual manner, with the shortest filaments near 

 the head, and those near the tail considerably longer, sometimes one-third as long 

 as the body. The antennae are eight-jointed; joint one is swollen, as broad as long; 

 two and three subequal, each about as long as one; four, five, six and seven subequal, 

 a little over half as long as two or three; eight usually a little longer than five and 



Fig. 10. — Clover-root Mealy-bug. Dactylopious trifolii. Antenna, leg and ano-genital ring. 



Greatly enlarged. Original. 



fix joined. There is considerable variation in four, it is sometimes smaller than five, six 

 or seven, and sometimes slightly larger. The legs are dirty yellow, in length the 

 tarsus of hind leg is slightly more than half the tibia, which about equals the femur. 

 Digitules four; the two superior long and slender, the two inferior shorter and more 

 stout. (The digitules were not distinct, but appeared as described.) Anal tubercles 

 not prominent, with a mass of small glandular spots and bearing one long hair, with 

 sometimes several smaller ones. Among the glandular spots are placed two conical 

 projections or processes on each tubercle. These processes are from two to three times 

 as long as broad at the base. Derm dotted with small round glandular spots. Back 

 near the caudal margin, spotted with larger round glandular spots. 



