MURIDAE—SIGMODONTES—HESPEROMYS LEUCOPUS. 61 
between these extremes is hence about fifty per cent. of the mean—a striking 
example of the unreliability of this character as a specific distinction. ..... 
The number of the vertebree varies from twenty-four or twenty-five to above 
thirty. In regard to absolute size, the length of the head and body together 
in Massachusetts specimens rarely exceeds four inches; the average is between 
three and a quarter and three and a half; perhaps nearer the latter.” 
In continuation of this matter, we next bring in our entire series of 
Hesperomys leucopus from Eastern North America, embracing specimens from 
Labrador to the Carolinas, and westward to Kansas, inclusive (our Arctic 
and western examples are elsewhere tabulated and discussed). We admit to 
this series only what we claim as unquestionable leucopus proper, excluding 
even the recognizable geographical races. And even after this exclusion, 
there are siz nominal species from the region just indicated requiring our 
attention. 
TABLE XI.— Measurements of about one hundred (and list of many more) specimens of HESPEROMYS LEUCOPUS 
from Eastern North America. 
(LN. B.—AIl measured dry unless otherwise stated.] 
Nose to— peel sales 
g Loeality. Collector. & & Remarks. 
E sla leleliflelelele 
so e138 S a 2 s os 3 
ee SIR |R a|F|/R a | RS 
3924 |.---; Labrador.-..-...-.. H. De Saussure. .|0. 56)t. 01). .-.)3. 00/2. 90}3. 00:0. 340. 76/0. 58) “‘artiens”, Sauss. 
SOD meet a O02 ea ee See e OO tence «5-8 0 AGONGOl sa a c0 46}2. 55,0. 33.0. 74/0. 39) “ bairdii”’, Sauss. 
1472) |p 23>) Malifax NS S)..5-52 J.B. Gilpin ./3. 00/2. 50}2. 75]... |0. 80]... 
1473 |.---|..--do Sei ae -|3. 20/2. 70} 2, 90)... ./0. 80}... . 
1 9058. |.--.]...-do.. e2-d0ie= 3 .|.-..}260)2. 75}. ....10. 80]... 
2059 |... |....do dope a . {2 85] 8. 00]. ..0. 81)... 
2060 |.--..| ...do =) 00 oes ee eee «-|3. 25]3. 40}... -/0. 84]. 2. 
2061 |---.|.--.do-- aE UO) a erere -.|3. 10]3. 30]. -.|0. 82).... 
1b ye) ees Re ye J. Downes. -.|3. 25] 3. 45}... ./0. 73}. - .- 
BS5R Poe pee dOV acess Sol eed oon aS =| BPs BARA =) 
3910 $5) rere J. R. Willis...... res Pemtotel| sara \3: 00/2. 90) 3. 10)... . 0. 82/0. 60 
983 |.--.| Montreal, Canada.|.-....-........... 0. GO}. ...|L. 23:4. 20/3, 76}4. 16). ...|0. 85)0.67) Sapposed ‘‘myoides”, but typ- 
2 5 ical leucopus. 
Sr Agerinia ----| Belfast, Me........| G. E. Brackett ..]....]....].--./3. 00}... | .../.-- |0. 80/0. 55) Typical leucopus. 
833 |.-- | Burlington, Vt.-.-..| Z. Thompson ....]....]....}-.~./3. 60/3. 20)3. 35). .../0. 78)..-.| Supposed myoides, but typical 
i leucopus. 
832 ...{3. 40/3, 05]3, 15)... ./0, 80/0. 65) Typical leucopus. 
834 SV Ea ae i PATA Ply (0) [Aaa 2d RS ee do. 
1312 | 9? ..{L. 17/3. 00/3, CO}... .)....]....].-..] Type of ‘myoides ”. 
1313 | ¢ 1.1713. 50]3. 9014. 25]....|....]..-.|-.---- do. 
10424 
to ==; | Caer hy eee SPR OGIe Ramee «tals Beco [aren emer temas litt [emalemaie| wens] some | AACONOUO; “SORDNE- 
10429 
eC W (DSW a ES OG Ce eee reser BR EAOO Recast yl RC ae a base ....|.--.|.--:| Measored in alcohol; typical 
j of “myoides ". 
Ei hee Atl (hs eer 4 HES CL REA EB ee Pee sy el eel eel ee SEH PSs] hos!) Sp5s< do. 
Pye Wy eee RASA Cy eee ae 4 See 0h ps Se) (Ge) See We aol tl Bae Be Ses) GSS Ser C05 
rE T alte NS GUN eee meee nr eee 0. 50|0, 87/1. 11/2, 95/3, 03} 3. 28.0. 35/0. 78/0. 64]... do. 
