250 university of colorado studies 



Order ZYGOCHETA 



This includes the common millipedes of our region. 

 Family PARAIULID^ 



(94) Parajulus Humbert and Saussure. Our material was immature, but Professor 

 Chamberlin says was P. venustus Wood, with scarcely a doubt. It was taken 

 at Salina, April, 1907. 



Class CHILOPODA (Myriopoda Auctt., part.) 



The centipedes. 



Order SCHIZOTARSIA 



Tracheae opening through seven unpaired spiracles arranged along the median 

 dorsal line; antennae and legs very long. 



Family SCUTIGERID.E 



(95) Scutigera Latreille. 5. forceps Rafinesque. These curious centipedes occur 

 in houses, and specimens caught in Boulder have several times been brought in 

 by students. The species is not a true member of our fauna, but is of southern 

 origin. 



Order ANAMORPHA 



Tracheae opening through paired spiracles; adults with 15 pairs of legs. These are 

 the common centipedes of our region. Professor Chamberlin has published a 

 synopsis of the suborder Lithobiomorpha, as known to occur in Colorado, in 

 Canadian Entomologist, February, 191 1. 



Family LITHOBIID-ffi 



(96) Lithobius Leach. The following key to our species is adapted from Chamber- 

 Un: 



Angles of the 7th, 9th, nth, and 13th dorsal plates produced; antennae with 30 



to 40 joints L. mordax Koch. 



Angles of the 9th, nth, and 13th dorsal plates produced; claw of penultimate 



legs armed with a single spine L. harrieta Chamberlin. 



Angles of none of the dorsal plates produced; claw of anal legs armed with one 

 spine at base; antennae normally with 20 to 21 joints; claw of penultimate legs 

 with two spines L. coloradensis (Cockerell). 



Order EPIMORFHA 



Tracheae opening through paired spiracles; 21 or more pairs of legs. 



Family SCOLOPENDRID.ffi 

 Large centipedes with 21 or 23 pairs of legs. 



(97) Scolopendra Linn6. 5. heros Girard. Adults 100-150 mm. long; first 

 dorsal plate with a transverse sulcus; second tarsal joints armed, except those of 

 anal pairs of legs; spines of anal legs 17-25 (BoUman). A specimen was taken by 

 Professor R. D. George at Valmont Butte, September 25, 1907. 



