DICHEOPLUS. 301 



Although I have seen specimens of a Melanoplus (M. devastator) labelled Pezotettur; 

 mexicanaX, presumably by Saussure himself, Brunner von Wattenwyl, who must 

 have examined the types, places Saussure's P. mexicana in Dichroplus. Saussure's 

 remark concerning the variation of the colour of the hind tibiae was undoubtedly based 

 on this other insect which was erroneously included in his P. mexicana. The present 

 species has not been recognized among the material studied by me or by Scudder when 

 working on his Revision of the Melanopli. 



2. Dichroplus punctulatus, Thunb. 



Gryllus punctulatus, Thunb. Mem. Acad. St. Petersb. ix. p. 408 (1824) \ 

 Pezotettix (Trigononymphus) punctulatus, Stal, Recens. Orthopt. i. p. 77 (1873) 2 . 

 Pezotettix [Dichroplus) punctulatus, Stal, Obs. Orthopt. iii. p. 6 (1878) 3 . 



Dichroplus punctulatus, Bruner, Locusts of Argent, p. 76, figg. 39, 40 (1900) 4 ; Proc. U.S. Nat. 

 Mus. xxx. p. 681, t. 38. figg. 3, 4 (1906) 5 . 



Bab. Mexico 5 ; Costa Rica (Biolley), Monte Redondo (L. Bruner), Cache (Rogers). 

 — South America 1_5 . 



This is the most widely distributed species of the genus, and, although quite 

 variable as to size, robustness, and colour, is the most easily recognized on account of 

 its red hind tibise and regularly conspersed tegmina. 



3. Dichroplus morosus, Rehn. 



Dichroplus morosus, Rehn, Proc. Acad. Nat. Sci. Philad. 1905, pp. 442 ( ? ) l , 805 ( c?) 2 - 

 Hob. Costa Rica, Monte Redondo l , Tablazo 2 . 



1 have not seen this species, as it is not contained in the material studied. 



4. Dichroplus fuSCUS, Thunb. 



Gryllus fuscus, Thunb. Mem. Acad. St. Petersb. v. p. 235 (1815) \ 

 Pezotettix {Trigononymphus) fuscus, Stal, Recens. Orthopt. i. p. 78 (1873) 2 . 

 Pezotettix (Dichroplus) fuscus, Stal, Obs. Orthopt. iii. p. 6 (1878) 3 . 



Dichroplus fuscus, Gig.-Tos, Boll. Mus. Zool. Anat. Comp. Torino, ix. no. 184-, p. 21 (189l) 4 ; 

 Brunner, Berl. ent. Zeitschr. xlv. p. 257 (1900) \ 



Had. South America, Colombia, &c. 1-5 . 



D. fuscus doubtless extends northward into " Biologia" territory. 



5. Dichroplus notatus, sp. n. (Dichroplus mexicanus, Tab. IV. figg. 16, 

 16a, $.) 



A rather small but moderately robust species in which the sexes are very unequal in size, and the tegmina 

 and wings reach the apex of the abdomen, but fall short of the tip of the hind femora ; the latter 

 strongly and obliquely banded with black, the hind tibiae fuseo-plumbeous, with a dingy testaceous 

 sub-basal annulus. 



