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EXPLANATION OF PLATE I. 



Right eye patch, Sinella curviseta Brook. 

 Claws, Sinella curviseta Brook. 

 Mucro, Sinella curviseta Brook. 

 Claws, Isotoma bidenticula Guth. 

 Mucro, Isotoma bidenticula Guth. 

 Mucro, Isotoma aquae n. sp. 

 Postantennal organ, Isotoma aquae n. sp. 

 Ocelli, Isotoma aquae n. sp. 

 Claws, Isotoma aquae n. sp. 

 Mucro, Isotoma besselsii. 



EXPLANATION OF PLATE II. 



Chxws, Isotoma aspera n. sp. 



Mucro, Isotoma aspera n. sp. 



Left eye patch, Isotoma aspera n. sp. 



Postantennal organ, Isotoma aspera n. sp. 



Mucro, Isotoma minima Guth. 



Mucro, Isotoma catena Guth. 



Claws, Isotoma catena Guth. 



Claws, Isotoma palustris Muller. 



Mucro, Isotoma palustris Muller. 



Antenna, Isotoma palustris Muller. 



Claws, Drepanura californica n. sp. 



Mucro, Drepanura californica n. sp. 



Left eye patch, Drepanura californica n. sp. 



EXPLANATION OF PLATE IIL 



Right eye patch, Entomobrya sexoculata Schott. 



Claws on last pair of legs, Entomobrya sexoculata Schott. 



Claws, Entomobrya binoculata Schott. 



Claws, Entomobrya clitellaria Guth. 



Claws, Entomobrya multifasciata TuUb. 



Left eye patch, Entomobrya viultifasciata Tullb. 



Claws of first pair of legs, Entomobrya layuna Bacon. 



Claws of second pair of legs, Entomobrya laguna Bacon. 



Claws of third pair of legs, Entomobrya laguna Bacon. 



EXPLANATION OF PLATE IV. 



Claws, Tomocerus vulgaris Tullb. 



Claws, Tomocerus bidentatus Folsom. 



Spines of left denies, Tomocerus bidentatus Folsom. 



Claws, Cyphoderus albinus Nic. 



Antenna, Cyphoderus albinus Nic. 



Right eye patch, Achorufes californica n. sp. 



Claws, Achorufes californica n. sp. 



Setae near median dorsal line of thorax, Achorutes californica 



Left postantennal organ, Achorufes californica n. sp. 



Right postantennal organ, Achorutes californica n. sp. 



Anal horn, Achorutes californica n. sp. 



EXPLANATION OF PLATE V. 



Mucrone, Achorutes californica n. sp. 



Mucrone, Achorutes citri n. sp. 



Anal horn, Achorutes citri n. sp. 



Left postantennal organ, Achorutes citri n. sp. 



Setae near median dorsal line of thorax, Achorutes citri n. sp. 



Claw, Xenylla collie n. sp. 



Setae near median dorsal line of thorax, Xenylla collis n. sp. 



Mucrone, Xenylla collis n. sp. 



sp 



