Mites Injurious to Domestic Animals. 59 



sulphur in suspension. Sodium fluoride solution should not be 

 allowed to remain in galvanized vessels or tubs for any length of 

 time or it will damage them. 



Two species of Sarcoptid mites (Cytoleichus (=Cytodites) nudus, 

 Vizioli, and Laminosioptes cysticola, Vizioli) are internal parasites 

 of the fowl, and both are frequently found in this country. 

 Cytoleichus nudus (fig. 16) is a minute soft-skinned, smooth, oval 

 mite, the hairs on its body being few in number and very short. 







FIG. 44. 



Leptus (Trombicula ?) similis, Hirst (p. 78). A larval Trombidiid mite 

 occurring on the domestic fowl in North America, x 130. (Original.) 



Numbers of this mite often occur in the air sacs and respiratory 

 tract of the fowl, pheasant, etc. It is possible that when present 

 in very large numbers they may affect the health of their host. 



Another species of Cytoleichus (C. banksi) is a parasite of squirrels 

 in California, whilst two specimens of a species of this genus were 

 found by Castellani embedded in the fat of the omentum of a dead 

 negro in Uganda. 



Laminosioptes cysticola (fig. 17) is a much more elongated species. 

 Its presence may be detected by the occurrence of calcareous 



