NO. 1215. REVISION OF THE GENUS TRIMEROTROPIS—McNEILL. 397 



//.v, ^w^praeclara. are confined to Xeln-aska; three also, unhila, modtsta.^ 

 and niclanojJtera., to New Mexico; two, fratercula and cfn/ijjefihw's, to 

 AV.voniing, 



Through the kindness of Dr. S. 11. Scudder and Prof. Lawrence 

 Bruner I have l)cen able to idcntif}^ positively all the species descriljed 

 b}' these gHnitlemen except Tranerofrojji.s thalam'tca Bruner. Of the 

 comparativeh^ few species described b}^ Saussure and other European 

 students of the order, though the types have been inaccessible, 

 identification has in nearly all cases been satisfactorily made through 

 collections made in the localities from Avhicli these species were first 

 described. For this and other material, which has been the most 

 important aid I have receiA^ed, I am greatl}' indebted to Dr. Bruner. 

 I am also under great obligations to the authorities of the U. S. 

 National Museum for free access to its collections upon which this 

 paper is leased, and for materials placed in m}' hands for use in the 

 preparation of this paper. I am similarly indebted to the Leland 

 Stanford Junior University. 



I have made no attempt to give complete synonomA' of the species, 

 but have usualh' contented myself with references to papers contain- 

 ing specific descriptions. 



In naming the veins 1 have adopted Redtenbacher's terminology 

 as modified by Comstock, as a study of the tracheation and venation of 

 Orthojjtera., on which I have been engaged for several months, has 

 convinced me that it is possible to determine with almost complete 

 certainty what these homologies are, and it is desirable from everj^ 

 standpoint that one system of names should be emplo^^ed in all the 

 orders. It should be noted, however, that while the homology of the 

 main veins and branches is established to my satisfaction, there is still 

 uncertainty about the homology of the branches in some cases, and I 

 have thought best to enumerate the branches of i?., in the tegmina 

 as simply accessory branches instead of the primitiA'e forks which 

 some of these branches should represent. In speaking of the regions 

 of the tegmina and wing, to which it is convenient to refer in diag- 

 noses, I have divided these organs into three fields, as follows: 

 ^''Anterwr^''' m front of R^; " //i/^WZc,*' between R^ iu\(\. Id A\ "jjos- 

 terlof^' behind ht A (Plate XXI, fig. 4). The term area has been 

 applied to the part of a field immediately posterior and adjacent to a 

 vein or a named branch, and it bears the name of this vein or branch, 

 as, for example: Area J^lies behind J/in the basal half of the tegmina 

 or wing, while area J/j lies between J/i and J/3 in the distal half of the 

 wing or tegmina (Plate XXI, figs. 1 and 2). Spurious veins, as /, and 

 unnamed veins (Plate XXI, fig. 3, / and .S') do not give names to the 

 areas which they precede. 



The term '"•cell" retains the meaning, given to it in the otlun- orders, 

 of a portion of the tegmina or wing bounded by veins or veiulets. 



