136 
THE PERIODICAL CICADA, 
made several years since by Mr. Pergande, who collected several of 
the mites and mounted and made preliminary studies of the others. 
Fie. 64.—Mite egg parasite, 
Pediculoides ventricosus. 
Much of the material was collected by Mr. 
E. W. Allis at Adrian, Mich., in 1885, the balance 
by Mr. Pergande in the District of Columbia and 
near-by Cicada districts in Virginia in the same 
year. 
THE ORIBATID MITES. 
The members of the family Oribatidxe have 
the popular designation of “beetle mites,”’ aris- 
ing from their possessing a hard chitinous cover- 
ing causing them to resemble minute beetles. 
Some six distinct species were found in the adult 
stage associated with the eggs of the Cicada, and 
several nymphal forms—the latter being often 
showily colored and the principal feeding stage 
of these mites. 
(Author’s illustration.) 
The following are Mr. Banks’s determinations 
of the oribatid material: (1) Oribata sp., collected by Mr. Pergande in 
the District of Columbia in July, 1885 
lected by Mr. EK. W. Allis at Adrian, 
Mich., in October, 1885; (3) Oripoda 
elongata Bks., MS. (fig. 62), collected 
with the last; (4) Oppia pilosa Bks. 
(fig. 63), also collected at Adrian, 
Mich.; (5) Oribatula sp., collected 
by Mr. Pergande in the District 
of Columbia and in Virginia in 
July, 1885; (6) Oribatid nymphs, 
collected with the last and possi- 
bly belonging to the same species; 
(7) Hoplophora sp., collected by 
Mr. Allis in Michigan in October, 
1885. 
MISCELLANEOUS PREDACEOUS MITES. 
The following mites have well- 
known predaceous habits and for 
the most part are miscellaneous 
feeders, subsisting on almost any 
available animal matter, such as 
; (2) Oribatella sp. (fig. 61), col- 
Fic. 65.—Mite egg parasite, Tyroglyphus cocci- 
philus. (Author’s illustration.) 
soft-bodied insects, insect eggs, and various animal and also 7 eee 
food products. 
