288 HENRY C. MCCOOK. 



tute of the hair-like tufts, and probably serve simply as scavengers, 

 or, are permitted to remain as "squatters" in the formicary, for some 

 purpose the economy of which is unknown. Cedius Ziei/Ieri, Leconte, 

 Fig. 10, 2, was taken in a hill of F. rufa at Bedford, Pa. It has short 

 elytra, the color is brown, the length is one-tenth of an inch. On each 

 of the first pair of legs are two spines, one located (apparently) at the 

 base of the femur, the other on the trochanter. The remaining speci- 

 mens were also taken at Bedford, Pa., and are an undescribed ffpecies 

 of Homalota, and an unnamed species of Oxypoda. They are small 

 brownish insects, with a slight pubescence. 



Liai'Tfe, Cocci and Aphides with Ants.— That the cocci may 

 contribute quite largely, and the larvae of some beetles more or less, to 

 the limited supply of food required by the ants in the cold season, is 

 probable. I have taken larvse in the mounds, and two were sent by 

 Mr. Kay from a frozen mound opened by him. I have never taken 

 them in positions that justified the belief that they were attended by 

 the ants, they having been brought out in the broken earth of the 

 hills. Mr. Kay's specimens were pi'obably taken in the same way. 

 Prof. Leidy (Proc. Acad. Nat. Sci. 1877, p. 145), found, in the early 

 spring, that a small colony of yellow ants (probably Lasiua Jlavus), 

 had three diflFerent insects in their possession, consisting of a species of 

 aphis, a coccus, and the larva of an insect which Dr. Horn informs 

 me is of some species of Coleoptera. The aphides were kept in two 

 separate herds, and these were separated from a herd of cocci. The 

 larva v/as in the midst of one of the former herds. In a larger colony 

 of the same ants, there was a herd of aphides which occupied the 

 under part of one margin of the stone under which the formicary 

 opened, and was almost ten inches long by three-fourths of an inch 

 in breadth. 



The number of "domestic cattle" included within such a space was 

 obviously very large. This same colony was also possessed of a herd of 

 cocci who were closely crowded together and occupied about a square 

 inch of space. These were kept quite separate from the aphides. In 

 both the above colonies the aphis and coccus were the same. The aphis 

 was of a pale yellow color with white tubercles on the dorsal surface 

 of the abdominal segments. The coccus was of a dark-red hue. Both 

 aphides and cocci with few exceptions adhered to the under surface of 

 the stones, and were not attached to roots. They appeared to be care- 

 fully attended by the ants who surrounded them. I have frequently 

 observed white aphides, apparently the same as the above, in similar 



