DACTYLOTUM.-— RHYTIDICHBOTA. 337 



5. Dactylotum histricum, Rehn. 



Dactylotum histricum, Rehn, Proc. Acad. Nat. Sci. Philad. 1904, pp. 539, 540 \ 

 Hob. Mexico, La Joya, San Luis Potosi 1 . 



This insect seems to come closer to D. pictum than to any of our other described 

 species. The rather distant habitat and the much longer tegmina, however, indicate 

 its distinctness. 



[6. Dactylotum pictum, Thomas. 



Pezotettix pictus, Thoni. Proc. Acad. Nat. Sci. Philad. 1870, p. 78 \ 



Pezotettix [Dactylotum) pictus, Bruner, Bull. Div. Ent. U.S. Dept. Agric. iv. p. 57 (1884) \ 



Dactylotum pictum, Scudd. Proc. Dav. Acad. Nat. Sci. viii. p. 67 (1900) 3 . 



Rah. North Ameeica, various localities on the plains and east slope of the Rocky 

 Mountains between Montana and Southern New Mexico 1_3 . 



There is a bare possibility that this species reaches Mexican territory on the higher 

 tablelands and mountain-ranges.] 



[AGESANDER, St&l. 



Agesander, Stal, Bihang till K. Svensk. Vet.-Akad. Handl. v. no. 4, p. 35 (1878) ; Syst. Acrid, i. 

 p. 35 (1878) ; Giglio-Tos, Boll. Mus. Zool. Auat. Comp. Torino, xiii. no. 311, p. 50 (1898). 



Agesander is still another of the Tropical American locust genera composed, so 

 far as at present known, of subapterous insects. Only a single species has been 

 described. 



[l. Agesander ruficornis, Stal. 



Agesander ruficornis, Stal, Bihang till K. Svensk. Vet.-Akad. Handl. v. no. 4, p. 81 (1878) x ; Syst. 

 Acrid, i. p. 81 (1878) \ 



Hab. Colombia 1 2 . 



While this insect has not been reported from "Biologia" territory, nor is contained 

 in the collections being studied, it is safe to include it here. Most of these jungle- 

 frequenting tropical forms live under conditions so similar that they usually enjoy a 

 comparatively wide distribution.] 



RHYTIDICHROTA, Stad. 



Rhyiidichrota, Stal, Recens. Orthopt. i. pp. 35, 54 (1873) ; Syst. Acrid, i. pp. 34, 75 (1878) ; 

 Giglio-Tos, Boll. Mus. Zool. Anat. Comp. Torino, xiii. no. 311, p. 50 (1898). 



The several species belonging to the present genus have the general appearance of 

 an Ommatolampis, Barm., from which they differ in several respects, as indicated in 

 the synoptic table of genera (antea, pp. 209-222). While the collections at hand do 



biol. CENTR.-AMER., Orthopt., Vol. II., November 1903. 2 Xx 



