MYRIAPODA 71 



Oregon, October, 1871 ; those represented in our figures at Corvallis, 

 Oregon, November, 1895, by S. C. Brown. 



Class CHILOPODA. 



As a group the Chilopoda are less distinctively tropical than the 

 Diplopoda. They are all carnivorous animals, of active habits, and 

 the genera and species have a very wide distribution. They are more 

 tenacious of life than the Diplopoda, and several species have already 

 become cosmopolitan through human agency. They are thus of dis- 

 tinctly less interest from the standpoint of distributional studies. 



ANALYTICAL KEY TO THE ORDERS OF CHILOPODA. 



Spiracles in a single series, located in the dorsal median line ; tarsi 

 long and whip-like, composed of very numerous small joints. 



Order SCHIZOTARSI. 

 Spiracles in two lateral series ; tarsi few-jointed. 



Body hatched with 7 pairs of legs, with 15 pairs when mature. 



Order ANAMORPHA. 



Body hatched with its full complement of 21 or more pairs of legs. 



Order EPIMORPHA. 



Order Schizotarsi. 



The Schizotarsi include the single genus Scutigera, the members 

 of which are all normally tropical or subtropical, though one species, 

 Scutigera forceps, has established itself widely in the continuously 

 warm buildings of American cities, doubtless including those of the 

 Northwest. The strangely elongated, many-jointed tarsi are very dex- 

 trously employed in catching and holding the flies and perhaps other 

 insects on which Scutigera feeds. 



Order Anamorpha. 



This order consists principally of the large temperate genus Litho- 

 bius, many species of which have been found in high latitudes in 

 Europe, Siberia, and North America. 



Family LITHOBIIDJE. 



Genus Lithobius Leach. 

 Lithobius LEACH, Trans. Linn. Soc. London, xi, pt. 2, p. 381, 1815. 



LITHOBIUS STEJNEGERI Bollman. 

 Lithobius stejnegeri BOLLMAN, Bull. 46, U. S. Nat. Mus., p. 199, 1893. 



