214 MUS, MUSCA. 



americanus, (american rat,) tail long, scaly; head 

 long ; nose pointed ; upper jaw longest ; ears 

 large, naked. About 8 inches long, or smaller. 



tnusculuS) ( house- mouse,) tail long, naked is h ; fore- 

 feet four-toed, hind feet five-toed, thumb with- 

 out a claw. '6 inches long. 



sylvaticus, (field-mouse,) tail long, scaly ; body 

 yellowish-brown, white beneath, breast yellow- 

 ish. Var. albus, entirely white. 



inessorius, (harvest mouse,) tail long, scaly ; body 

 rusty-brown, belly white, colours divided by 

 a straight line. 



Vifginianus, (pasture mouse,) tail all hairy, thick 

 at the base, long, tapering ; body whitish or 

 white, nose black. 



Qmphibws, (water rat,) tail middle length ; ears 

 hardly above the fur ; feet three- toed, with the 

 appearance of a fourth. Sometimes hind feet 

 five-toed. Dark or blackish. Body 7 inches 

 long, tail three. 



See MS. P. 



8 12. MUSCA. Spec, about 530. 



domestica, (house-fly,) with two short feelers ; 

 sucker with a single bristle without sheath j 

 hairy, black ; thorax with five pale lines ; ab- 

 domen tessilate, pale at the base beneath. 



cadtfverin(i) (carrion eater,) body polished ; thorax 

 blue ; abdomen green. Feelers and suckers 

 like domestica. 



mortuorum, (death fly, epidemic fly,) thorax black; 

 abdomen green bronze ; legs black ; thorax 

 with a few faint lines. Feelers and suckers 

 like domestica, 



