I'oMONA Col.I.KOK .lolllXM. OK F.NTOMOI.OOV 471 



twcntv-oiic or twi iitv-tliric) Ixitli fur >;cn<rji ami for s)n-cics. Coxa of nnal \vgn 

 absent or fused with tlic plciiru-, forniinjf tlitis tlu- so-cnllfd psriidoplcurn or 

 coxaplciira, and tlic trochanter absent or rudimentary. The pscudopleurre arc 

 stronj{ly developed and are more or less produced caudad at niesal side into the 

 so-called pseudopleural priK-esses, the processes often bearing a number of 

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

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

 tliose of the otiier legs undivided or biarticulate. 



The three f;iinilies of this sub-order may be sep.'iratid by mi-ans of the fol- 

 liiwiiig kiy. Of Ihise threi' f.-imilies two Jire known to be represented in Cali- 

 fornia : 



Key to Families ni 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 Crypfopidae. 

 AA. F.yes present, comjjosed of four ocelli on each side; tarsi of anterior legs 

 all biarticulate; lii>ia without sj>ines at distal end or rows of bristles 

 beneath. 

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

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

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

 tudinal furrows never present. Family Otoslii^midae. 

 BB. Spiracles angular, triangular or narrowly slit-like, j)arallel to long axis 

 of body; tarsal spines absiMit or only one in number; cephalic i)Iate 

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

 and longitudinal furrows present. Family Scolopendridae. 



I'aiiiily Cryptopidae 

 The genera of this family occurring within tin- I'nitrd ."states may be sep- 

 arated by means of the following key: 



Key to jjenera <>f the Cryptopidae 

 A. Twenty-one leg-bearing segments; ])airs of spiracles nine or nineteen. 

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

 it.s caudal margin convexly exeurved or bluntly angidar. 

 C. Pseudopliura not produced caudad into a slender priH-ess. 



Genus Cri/lops Leach. 

 CO. Pseudopleura produced e.'iudad into a slender process. 



Cnnus .1 lift hops Chamberlin. 

 BB. Last dorsal plate nearly twice as long as the peiuilt, longer than wide, 

 the caudal margin nearly straight. 

 C. Nine pairs of spiracles. Genus Thralops 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: fenuir of prehensorial feet with a basal tooth. 

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



Genus Olocri/ptop* Haas. 



