888 ZOOLOGY— INSECTS. 



Lower Arizona. From the collection of 1874; H. W. Henshaw. 



Stal lias restored the generic name Ercmobia of Serville in place of 

 Tlirincus of Fischer, and I think properly ; I have therefore followed him. 

 The specific name magna is given because it is supposed to be the largest 

 species of the genus known. 



ACRIDINI. 



This group corresponds almost exactly with Stal's subfamily Acridiidm. 

 He places Iihomalea in it, and I think very correctly. The changes in the 

 genera and transfer of species will be noticed in the appropriate places. I 

 shall retain the arrangement of the genera as given in my Synopsis. 



PEZOTETTIX, Burm. 



As heretofore stated and for the reasons given, I shall not follow Stal in 

 transferring our Calopteni to this genus, yet, at the same time, I admit that 

 these groups need revision, and would gladly adopt any consistent arrange- 

 ment which does not wholly revolutionize these genera. I may remark 

 here that Dr. Brunner de "VVattenwyl thinks my P. picta is the Bactylotum 

 bicolor of Charpentier ;' but a single glance at a specimen in color would 

 convince him of his error. 



PEZOTETTIX UNICOLOR, Thos. 

 Plate XLV, Fig. 5. 

 Pezotettix vnicolor, Thos., Synop., 151. 



I find some specimens which, although differing somewhat from the 

 type, I think belong to this species. The frontal costa is not sulcate, and 

 the wings are shorter. They are contained in the last collection, and were 

 probably obtained in the mountains of Southern Colorado, although the 

 exact locality is not given. 



PEZOTETTIX OEEGOXENSIS, sp. nov. 



Plate XLV, Figs. 2, 3. 



Caloptenoid in the form of the head and thorax; wings abbreviated. 

 Male. — Small and slender. Vertex but moderately deflexed, and 



