APPENDIX SS. 1843 



Section 1. 



ORTHOPTERA. 



By Prof. Cyrus Thomas. 

 Letter of transmittal. 



Washington, July 8, 1878. 

 . Dear Sir: The collection of Orthoptera which you have submitted to me for exam- 

 ination and determination, although small, is quite interesting and valuable, and will 

 aid the United States Entomological Commission in fixing the southern limit of the 

 range of Caloptenus spretus. 



Although containing nothing positively new to science, it is of great importance in 

 determining the range of species, color, &c. ; its chief value consisting in showing the 

 characteristics of the orthoptefal fauna of the region in which the collection was 

 made, Northern and Northwestern New Mexico and* Southern Colorado. I think I 

 could locate the collection from the specimens alone. 



From its examination one fact appears to be brought out, viz, that as we move 

 south along the Rocky Mountain range, especially after passing south and beyond South 

 Park, in Colorado, the effect of the altitude on the specimens becomes less marked. 



From the list of species given in the annexed report, it will be seen that no specimens 

 of Caloptenus spretus were captured, from which I infer that the section visited was 

 entirely free from this pest. As the species was abundant from British America to 

 Texas during the season the collection was made, we may reasonably conclude — what 

 I have long suspected to be the case — that its southern limit along the east flank 

 of the mountain is about the southern line of Colorado. 



I am a little surprised at finding no specimens of Tropidoloplius formosus in the col- 

 lection. I am inclined now to believe this species has a very limited range. 



Want of time has prevented me from studying the collection with the care I would 

 like to. The following report is herewith forwarded to yon for such use as you may 

 desire to make of it. 



Yours, very respectfully, 



Cyrus Thomas. 



Lieut. C. A. H. McCauley, U. S. A., 



Fort Leave)) worth, Kans. 



REPPRT. 



ACRIDIXLE. 

 TRUXALINI. 



1. OXYCORYPHUS OCCIPITALIS, TllOS. 



Syu. — Stenobothrus occipitalis, Thos., Syn. Acrid. X. Am. 81. 



One female in color, hind femora wanting. From this specimen I am able to add 

 the following to the original description: Head, antennae, and lower margin of the 

 pronotum dull ashy-purple color; a green stripe on each side, starting at the eye, ex- 

 tends backward along the upper part of the side of the pronotum and the lower margin 

 of the elytron to about the middle of the latter. In this specimen the discal dots are 

 fused into a median dark stripe. The disk of the pronotum rusty-yellow. (No. 86.)* 



2. Stexorothrus coloradus, Tlios. 



This species is so well marked that it is easy to distinguish it even in the pupa state. 

 The dark lateral lines are, in this pupa, shining black, andean be traced upon the 

 disk of the reversed wing-pads; there is a dark line margined each side by yellow, 

 running from the lower end of the eye along the lower margin of the pronotum; the 

 rest of the head and pronotum dull yellow. (No. 1.) One pupa, dry. (No. 6.) 



Xojf.. — The appended statement by Lieutenant McCauley will explain these figures. 



