10 



NORTH AMERICAN FAUNA 66 



3a. Canine teeth absent; incisors chisel-like 4 



b. Canine teeth present; incisors not chisel-Uke 5 



4a. Upper incisors 2-2 Lagomorpha (rabbits, hares, etc.) 



6. Upper incisors 1-1 Rodentia (gnawing mammals) 



5a. Canine teeth similar in appearance to other teeth; eyes inconspicuous 



Insectivora (moles, shrews, etc.) 



h. Canine teeth well developed; eyes not rudimentarj" 6 



6a. Tail prehensile; first digit on fore and hind limbs opposable; abdominal 



pouch present in female Marsupialia (pouched mammals) 



b. Tail not prehensile; first digit not opposable; no abdominal pouch pres- 

 ent Carnivora (flesh eating mammals) 



Key to the Order Insectivora in Maryland 



la. Forefeet greatly enlarged and adapted for digging 9 



b. Forefeet similar in size to hind feet and not adapted for digging 2 



2a. Tail short, less than 25 percent of total length of animal 3 



b. Tail long, more than 30 percent of total length of animal 4 



3a. Coloration grayish; size more than 100 mm.; 32 teeth in mouth 



Blarina brevicauda (short-tailed shrew) 

 b. Coloration brownish; size small, less than 100 mm.; 30 teeth in mouth 



Cryptotis parva (least shrew) 

 4a. Third and fifth upper unicuspid teeth minute so that only three of the 

 five upper unicuspids are visible when skull is viewed laterally 



Microsorex hoyi (pigmy shrew) 

 b. Only fifth unicuspid tooth in upper jaw minute so that four unicuspids 



are visible when skull is viewed laterally 5 



5a. Total length 145 mm. or more; hind feet large and fringed with stiff 

 hairs; third and fourth toes of hind feet thinly webbed for about half 



their length Sorex palustris (water shrew) 



6. Total length 135 mm. or less; hind feet not conspicuously large and not 



fringed with stiff hairs ; no webbing on any toes 6 



6a. Tail more than 55 mm. in length; coloration uniform dark gray through- 

 out Sorex dispar (long-tailed shrew) 



b. Tail less than 55 mm. in total length; coloration not uniformly dark 



gray 7 



7a. Total length greater than 110 mm Sorex fumeus (smoky shrew) 



6. Total length under 100 mm 8 



8a. Coloration reddish brown Sorex longirostris (southeastern shrew) 



b. Coloration dull brown or grayish brown Sorex cinereus (masked shrew) 



9a. Snout fringed with fleshy projections; tail long, more than 50 mm. in 



length Condylura cristata (star-nosed mole) 



b. Snout not fringed with fleshy projections; tail less than 40 mm. in 



length 10 



10a. Tail thin, flesh-colored and scantily haired 



Scalopus aquaticus (eastern mole) 



b. Tail thick, blackish and well haired 



Parascalopb breweri (hairy-tailed mole) 



Key to the Order Chiroptera in Maryland 



la. Interfemoral membrane wholly or partially furred on upper surf ace 2 



6. Interfemoral membrane not furred on upper surface 4 



