The Pselaphid^ of North America. 217 



As to classification, it is a matter of comparatively small 

 moment whether we call a particular group genus or sub- 

 genus, provided only the group be recognizable. Any varia- 

 .tion in nomenclature or classification will, however, be noticed 

 appropriately in the proper place. 



As to the natural sequence of genera, now apparently con- 

 tinuous, future discoveries in the Pacific region will perhaps 

 necessitate some changes. If vye take into account the fauna 

 of other countries, the difficulties are greater, and will not be 

 solved until more exhaustive investigation shall supply some 

 form.s now lacking. 



Having collected in different parts of the United States and 

 obtained by exchange specimens from elsewhere, we have 

 been enabled to compare most of the species described. Of 

 the species not in our possession some have been borrowed 

 for description here; the descriptions of such as we have not 

 handled are inserted in their original form. Names not 

 accompanied by sufficient description are merely mentioned. 



In the genus Bryaxis the section Reichcnbachia is most in- 

 complete. Among the forms near to B. riibkunda are many 

 which cannot be kept asunder. In this case the extreme 

 members of the series are described. We approve the sep- 

 aration of Actium from Trmiium, and of Trimioflectus frcm 

 Eiiplcctus. The new genera present salient differences from 

 the old ones, both in general form and in minor diagnostic 

 characters. These changes may meet with criticism. We 

 have exercised our best judgment, and shall be first to welcome 

 any arrangement that can be shown to be better. 



" • • . . dum loquimur fugerit invida 



We shall always thankfully consider ourselves under obliga- 

 tions, for valuable information and specimens, to Dr. David 

 Sharp, London, Eng.; to Capt. Thos. L. Casey, U. S. A., for 

 various assistance and contributions; to Charles and Marie 

 Fuchs, of San Francisco, California, for many important con- 

 tributions. 



