80 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvi. 



"Xliere are given herein descriptions of eighteen species which I f 

 believe to be'' new, all but two of them having been collected at 

 Amherst, Massachusetts, and within a radms of 2 miles of the Massa- 

 chusetts Agricultural College, but even this field has not yet been 

 thoroughlv collected. The abundance of new species obtained withm 

 such narrow limits shows us how very little has been done upon this 

 order and therefore it will not be surprising, when more attention 

 shall be given to these tiny insects by collectors, if this small order, 

 which has been considered as insignificant in numbers as well as in 

 the size of its individuals, should prove to be quite extensive in the 

 number of its species. Of the new species described in this paper, a 

 complete set of types has been deposited in the Massachusetts Agricul- 

 tural College; a set of cotypes, so far as they exist, has been deposited 

 in the Unit^'ed States National Museum; a third set of cotypes I have 

 retained for my own use, and the remainder I have also deposited in 

 the Massachusetts Agricultural College. The number of specimens 

 from which the species has been described follows each description. 

 Eleven of the thirteen previously described American species have | 

 been redescribed as have also a number which I believe have been ■ 

 previously described in Europe. Descriptions of early stages have | 

 been given where known and the authority therefor noted in each 

 instance. It will be noticed that in all cases the description of the 

 female precedes that of the male, or the latter may be wanting | 

 entirely:. Among the Thysanoptera the females are much more 

 abundant than the males and also more characteristic when both are 

 known. For these reasons all of the descriptions are leased mainly 

 upon the female. It would be impossible to give a bibliography of 

 the species of this country without including many references to 

 European works. Therefore the bibliography is intended to include 

 the literature of this order for the world rather than for North i, 

 America alone. Each reference has been numbered so that it could be ! 

 referred to by number when desired without repeating the whole title. 

 Such references have been made by inserting the bibliographical ^ 

 number inclosed by a parenthesis where authority for a statement is ' 

 referred to, thus, (I). 



I desire here to acknowledge that I am under many ol)ligations to 

 those who have assisted in making this paper more complete by kindly 

 loaning type specimens, without the examination of which the identifi- 

 cation of several species could not have been certain. I should state, 

 that these types were not loaned to me directly, but to Prof. C. H. 

 Fernald, who kindly took upon himself the responsibility for them, 

 but as I have been the one to profit by them it gives me pleasure to 

 express my thanks to Prof. J. H. Comstock, through whose kindness 

 I was able to see the type of Zimothrips poaphagus; to Prof. Herbert 

 Osborn for the privilege of examining at my leisure his type of Thrips^ 



