PHYLUM AETHROPODA — CLASS ONYCHOPHORA 



291 



The digestive system is fairly simple, consisting of the esophagus, 

 stomach, and intestines. A pair of ]\Ialpighian tubules empty into 

 the anterior part of the intestines. The tracheae are branched, being 

 connected to a pair of spiracles on each body segment. 



Fig. 166. — Scolopendra. The large centipede of the Southwest. 



Dr. R. V. Chamberlin, one of the leading students of the millepedes 

 and centipedes, reports the following species of centipedes for the 

 Western United States: Scolopendra morsitins Linn.; S. heros 

 Girard and Arthrorhahdmus pygmaeus Pocock of the family Scolo- 

 pendridae. The species S. heros is a large dark greenish colored 

 species found in Kansas, Arizona, Southern California, and Texas. 



