THE ACARIXA OR MITES. 



99 



several species, some of which are found in fungi. Our most abundant species, C. 

 niger Banks, which occurs in fungi, has four rows of spatulate hairs on the dorsum. 



C. ohlonga Banks was found under the bark of a stump, and it looks much like a 

 tiny scolytid beetle. 



The typical genus Oribata (figs. 196, 197, 198) includes many nearly smooth species 

 with slender legs. One species, 0. minuta Banks (fig. 199), occurs abundantly in moss 

 and on deca>T.ng animal substances. It is pale yellowish brown in color and appears 

 to be widely distributed. Other species of Oribata (fig. 195) occur among dead, dry 

 leaA-es, and can run very rapidly. The nymphs are soft, whitish creatures with long 

 hairs, and often carry bits of dirt attached to the hairs. Under the name Tumidalvus 



Fig. 19o.—OTibaia gracilipes. (Author's illustration.) 



Fig. 196.— Venter of Oribata. (Author's 

 illustration.) 



americana Ewing has described a species of Tnpochthonius from Illinois. At the tip 

 of the body is a rounded swelling, and the long, stout bristles of the body are minutely 

 hairy. The largest oribatid we have is Neoliodes concentricus Say (fig. 203), a black 

 species \^T-th concentric rings on its elevated abdomen. It occurs in crevices of bark 

 of living trees throughout the Eastern States, and also in Europe. One species of 

 Cepheus, (Cymberemaeus) C. marginalis Banks (fig. 201), occurs under Lichens on the 

 bark of trees in the Eastern States. The type of this genus is C. minutus Koch, C. 

 latus Koch ha\ing been removed as the type of Tegeocranus. 



We have various species of Nothrus (fig. 204), or Camisia, as it may have to be called. 

 They are very rough-looking creatures, with a squarish body and short, rough legs. 



