Acarina 269 



and II of the male not unusually 



stout T. americanus. 



qq. With other characters and habits. 

 T. lintneri (fig. 150 f) the mushroom 



mite, and several other species, 

 mm. Cephalothorax with but two long distinct 

 bristles (besides the frontal pair), but some- 

 times a very minute intermediate pair; 

 tarsi I and II unusually short and not twice 

 as long as the preceding segment, 

 n. Tarsi with some stout spines . Rhizoglyphus Clap. 

 The species of this genus are vegetable feed- 

 ers. Several occur in the United States. 

 R. parsiticus and R. spinitarsus have been 

 recorded from the old world, attacking human 

 beings who handle affected plants, 

 nn. Tarsi with only fine hairs. . Monieziella Berl. 

 The species of this genus, as far as known, 

 are predaceous or feed on recently killed 

 animal matter. Several species occur 

 in the United States. M. ( = Histiogaster) 

 entomophaga (fig. 152) from the old 

 world has been recorded as injurious 

 to man. 

 gg. Genital suckers absent; integument with fine parallel lines. 



Parasitic on birds and mammals, 

 h. Possessing a specially developed apparatus for clinging to 



hairs of mammals LISTROPHORID.E. 



hb. Without such apparatus. 



i. Living on the plumage of birds ANALGESID.E. 



ii. In the living tissues of birds and mammals. 



j. Vulva longitudinal. In the skin and cellular tissues of 



birds CYTOLEICHID.E. 



This family contains two species, both occurring in the 

 United States on the common fowl. Laminosioptes 

 cysticola occurs on the skin and also bores into the 

 subcutaneous tissue where it gives rise to a cal- 

 careous cyst. Cytoleichus nudus is most commonly 

 found in the air passages and air cells, 

 jj. Vulva transverse. In the skin of mammals and birds 



SARCOPTIDJE 



k. Anal opening on the dorsum. 



I. Third pair of legs in the male without apical suckers. 



On cats and rabbits Notoedres Rail. 



The itch mite of the cat, N. cati (fig. 61) has been 

 recorded on man. 



II. Third leg in the male with suckers. On bats. . . . 



Prosopodectes Can. 



