ON THE CHILOPODA OF NORTH AMERICA. 



21 



spines of the lower surface, of basal articulations of last pair of legs, are more nume- 

 rous than in S. /terns, and arranged in four rows instead of three. The difference in 

 arrangement is, perhaps, more apparent than real ; the homologue of the first row of 

 spines existing in some specimens of S. heros, but being placed a little higher up, 

 they are thrown with those on the inner side of the limb. The angular process has 

 fewer spines than in S. heros. Finally, a glance at the tables will show that, though 

 the species exist on common ground, yet that heros is a more tropical and polymorplia 

 a more boreal animal. 









Table sh 



owing the variation. 



in some of the more important specific characters. 







cu 





w fi w • 

 C « * ?„ 



su 03 « 



SJ3 



c 

 o _ 





a, 



os 





O « « ■ 



a m « E- 



a> s* tn 



r a 



O 

 03 



i x 



t_ OS 



o c 



0J 







™ O O 0> 



.2 6C 



c 5 ^? 



c — 





° Z 





.5 J3 oj 



— O O 4. 



■- y 



C 5 ™ 





c c 



■g-3 



[3 



oi 



Spines c 

 side c 

 joint 

 pair o 



Spines o 

 surface 

 sal join 

 pair of 



O qj 



4/ ~ O 

 fl o t. 

 — GO. 



tc"~ 





*5 



[5 



Spines o 

 side o 

 joint 

 pair o 



Spines o 

 surface 

 sal jiiia 

 pair of 



raw. 

 ° cu 



OT O 



Oj — C 



of 





= s. 



Api- 

 cat. 



Mar- 

 ginal. 



Api- 

 cal. 



Mar- 

 ginal 







f4 



4 



2 2 4 1 4* 



3 



8 



1 







f4 



4 



2 3 4 3 1 



4 



6 



1 



CO 





4 



5 



23143 



3 



7 



1 







4 



3 



2 13 3 1 



3 



6 



1 



iz; 





4 



5 



13 3 3 



•2 



6 











4 





2 343 



4 



5 



2 



■ < 





4 



5 



2 3 3 



2 



6 











4 



5 



2 33 3 



3 



G 







t|_i 





4 



6 



2 3 5 1 3 



3 



5 



1 







4 



4 



•2343 



3 



7 



1 







4 



5 



3 3 4 3 



4 



S 



1 







4 



5 



3 3 43 



4 



7 



(I 



*o 





4 



6 



2 1241 



4 



6 







338 



< 



4 



5 



3 3 4 3 



4 



6 







O 



" 



3 



5 



2 1 -J 3 3 



4 



3 



2 



A rep. 



5 



3 3 5 3 



5 



(5 



1 



■- 





5 



5 



2 33 2 



4 



8 



1 







4 1 "" 



5 



42 54 



3 



7 



1 







4 



4 



•2 3 3 2 



5 



7 



1 







4 



5 



4 3 5 14 



5 



1 



1 







4 



5 



2 3 4 1 2 



5 



5 











4 



7 



2 2 2 4 2 



6 



6 



1 



o 





4 



5 



2 3 5 13 



4 



6 



2 







4 



6 



4 2 2 4 3 



4 



6 



1 



t-» 





3 



5 



3 24 3 



4 



6 











4 



C 



2 4 4 4 



4 



7 



1 



H 





2 



5 



2 3 3 13 



4 



5 



1 







,4 



? 



? ? ? ? 



1 



7 



1 



•210 

 337f 



C4 



5 



2 13 5 3 



3 



7 



1 







"4 



5 



3 2*4*4 4 



5 



G 



1 



? 4 



5 5 



5 

 11 



2 4 5 3 

 2 3 4 3 2 



3 

 3 



5 

 



1 



1 



339 



- 



4 



i 



5 

 6 



3 5 5 3 



3 15 4 4 



4 

 4 



5 

 G 



1 



1 



14 



? 



? ? ? 



? 







1 







5 



3 45 4 



4 



G 



1 



242 



(4 



i 



2 2 1 



4 



7 



1 







'4 



6 



33 5 4 



4 



7 



1 



(4 



3 



4 3 4 3 



3 



7 



1 







4 



7 



2 3 14 3 



2 



8 



1 





f4 



6 



2 2 4 3 



4 



6 



1 







4 



5 



3 3^4 



4 



8 



1 



135 



4 



5 



2 3 5 5 



4 



4 



1 



997 





4 



10 



3 43 3 



G 



7 



1 



4 



6 



2 4 244 



4 



7 



1 



u ( 



- 



4 



5 



3 2 3 4 3 



2 



G 



1 





U 



5 



13544 



4 



G 



1 







4 



5 



53 5 3 



2 



8 



1 



334 



|4 



7 



3 2 3 2 1 



4 



6 



1 





4 



7 



33 5 5 



4 



8 



1.1 



i* 



5 



43 43 



4 



5 



1 





J 



4 



3 44 4 



4 



7 







Specimens belonging to the. Smithsonian Institution. 



135 



2 



326 



5 



210 



1 



334 



1 



227 



4 



242 



1 



337 



1 



339 



2 



342 



2 



338 





324 



1 



211 



5 



Aripe Trip. 



Sonora. 



Fort Riley, Kansas. 



?Texas. 



Fort Rnchanan, Arizona. 



Fort Riley, Kansas. 



Fort McKavit, Texas. 



Sonora and Chihuahua. 



? 

 Fort Buchanan, Arizona. 

 Santa Fe 

 ?Santa Cruz. 



Dr. T. H. Webb. 



Dr. Graham. 

 Mr. Bravat. 



Dr. Irviii. 

 H. Brandt. 

 Capt. Plummer. 

 Major W. 11. Emory. 



? 

 Dr. Irvin. 

 Mr. Howard. 

 Dr. Webb. 



Unc. 2f- 



t: n 3 



H 



H 



H 



31, 



1J-3I 

 3jj 



31 



' i 



3 

 4 



Locality undoubtedly mistaken. 

 * The typical number of rows is four. The variations from this arc caused by some of the spines being a 

 fraction of a line from their normal position ; they generally may be placed in four crooked rows. 

 t Are the hind legs with the anal appendages the original ones, or are they reproduced? 



G 



