Pomona College Journal of Entomology 471 



twenty-one or twenty-three) both for genera and for species. Coxa of anal legs 

 absent or fused with the jileur*, forming tlius the so-called pseudopleura or 

 eoxapleura, and the trochanter absent or rudimentary. The pseudopleurae are 

 strongly developed and are more or less produced caudad at mesal side into the 

 so-called i)seudo))leural processes, the processes often bearing a number of 

 spines which may also exist on the caudal margin ectad of tlie process ; always 

 densely porose over surface. Tarsi of anal legs from two to many segmented, 

 those of the other legs undivided or biarticulate. 



The three families of this sub-order may be separated by means of the fol- 

 lowing key. Of tliesc three families two are known to be represented in Cali- 

 fornia: 



Key to Families of the Scolopendroidea 

 A. Without eyes; tarsi of all legs excepting the anal and penult pairs unseg- 

 mented ; tibia at distal end with one or two spines or with bristles ar- 

 ranged in longitudinal rows beneath. Family Cryptopidae. 

 AA. Eyes present, composed of four ocelli on each side; tarsi of anterior legs 

 all biarticulate ; tibia witliout spines at distal end or rows of bristles 

 beneath. 

 B. Spiracles oval or circular, oblique to long axis of body; tarsal spines 

 generally present and two in number on the anterior legs ; cephalic 

 j)late never overlapping the first dorsal plate; basal plate and longi- 

 tudinal furrows never present. Family Otostigmidae. 

 BB. Spiracles angular, triangular or narrowly slit-like, parallel to long axis 

 of body; tarsal spines absent or only one in number; cephalic plate 

 often overlapping the first dorsal plate or in other cases basal plate 

 and longitudinal furrows jiresent. Family Scolopendridae. 



Family Cryptopidae 

 The genera of this family occurring within the United States may be sep- 

 arated by means of the following key: 



Key to genera of the Cryptopidae 

 A. Twenty-one leg-bearing segments ; pairs of spiracles nine or nineteen. 

 B. Last dorsal plate not longer than the penult, mostly shorter than wide, 

 its caudal margin convexly excurved or bluntly angular. 

 C. Pseudopleura not produced caudad into a slender process. 



Genus Crytops Leach. 

 CC. Pseudopleura produced caudad into a slender process. 



Genus Anethops Chamberlin. 

 BB. Last dorsal plate nearlj' twice as long as the penult, longer than wide, 

 the caudal margin nearly straight. 

 C. Nine pairs of spiracles. Genus Theatops Newport. 



AA. Twenty-three leg-bearing segments ; pairs of spiracles ten or eleven. 

 B. Anal legs with a claw and a two-jointed tarsus; prefemur of anal legs 

 with but two spines ; femur of prehensorial feet with a basal tooth. 

 C. Seventh segment without spiracles (ten pairs of spiracles present). 



Genus Oiocryptops Haas. 



