. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. Tig 174. — Uropoda sp.; p, Pedicel. (Author's illustra- tion.). Fig. 175. Uropoda sp., from below. (Author's illustration.) some are smooth, others hairy; nearly all of a red-brown fawn color. The species of Glyphopsis have also been found in ants' nests, and seem to live on good terms with the ants, although their exact status is not known. One species, G. michaeli Ewing, is recorded from Illinois. It differs very Uttle from Trachyuropoda. TJroseius and Poly- aspis are based on a few forms, and not wel
. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. Tig 174. — Uropoda sp.; p, Pedicel. (Author's illustra- tion.). Fig. 175. Uropoda sp., from below. (Author's illustration.) some are smooth, others hairy; nearly all of a red-brown fawn color. The species of Glyphopsis have also been found in ants' nests, and seem to live on good terms with the ants, although their exact status is not known. One species, G. michaeli Ewing, is recorded from Illinois. It differs very Uttle from Trachyuropoda. TJroseius and Poly- aspis are based on a few forms, and not well known; a species of the latter genus has been found on Orthosoma in Ohio. Trachytes contains two or three p>Tiform species found in moss. The genus was formerly called Celaeno. Cilliba is similar in appearance to Uropoda. Some species have been found in moss, but others occur parasitically upon ants, attached to the thorax or abdomen. One of our species, C. circularis Banks, has been found thus fastened to the thorax of Cre- mastogaster lineolata. Another species, C. hirsuta Banks (fig. 176), was taken upon a species of Lasius in Arizona. The relation existing between the Cilliba and the ant has formed the subject of several recent investi- gations, both by Wasmann and by Janet. The mites which cling to the abdomen of the ant do not seem to be disturbed by the ant, but if a mite was placed on the ground of the nest it was seized and destroyed by the ants. The mites bite through the soft skin situated between the segments, and thus draw blood from theii- hosts. The genus Dinychus (fig. 177) is peculiar in having enormously long extensile flexible mandibles. The mandibles are more than twice as long as the entire animal, and can be retracted so that the bend in them is close against the posterior walls of the abdomen. The tips of these mandibles are distinctly chelate. We have one species in this country. From New Guinea, Canestrini has described several species of a remar
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