ORTHOPTERAACRIDIDAE ACHURUM AGRIDODES. 865 



TRYXALIS. 



TRYXALIS BREVIPENNIS, Thos. 



Tryxalis brfvipennis, THOS., Syuop., 58. 



This, I presume, will have to be removed to Achurwm, and will then 

 become Achurum Irevipenne. 



TRYXALIS BREVICORNIS, Linn. 



Grillus bremcornis, LINN., Cent. Ins., 1763> 15, 37. 

 Acrydium ensicornu, DE GEER, M6m., 1773, iii, 499, 16, pi. 42, f. 7. 

 Tryxalis brevicornis, BURM., Handb. Ent., 1838, ii, ii, 607, 3. 

 Pyrgomorpha brevicornis, WALK., Cat. Dermap. Salt., 1870, iii, 500. 



Stal's restoration of Acrida for the typical Tryxalidce, and retention of 

 Tryxalis for its earliest signification, will restore this species to the position 

 assigned it by Fabricius. He has also identified De Geer's A. ensicornu 

 with this species by an examination of the original specimen. I have deter- 

 mined, beyond any reasonable doubt, that the Tr. notocMorus, of Pal. Beauv. 

 is the male of this species. 



My P. punctipennis (Synop., 68) is but the female of this species ; conse- 

 quently this name will have to be suppressed. 



ACHURUM. 



This genus should now precede Tryxalis in a linear arrangement. 

 The following new species from Mexico is described by Stal : 



ACHURUM ACRIDODES, Stal. 



Achurum acridodes, STAL., Recens. Orthop., 1873, 101. 



Truxalis acridodes, STAL., Ot'v. Vet. Ak. Forb., 1873, xxx, 4, 52, 1. 



Fusco-testaceous ; vertex, dorsum of the pronotum, and anal area of 

 the elytra greenish ; cheeks and lateral lobes of the pronotum near the dor- 

 sum obscui'e ; elytra griseo-hyaline, except the anal area, which is veined 

 with fuscous; wings dusky. $ , length, 27 millimeters. 



Closely allied to A. Sumichrasti, Sauss., but differs in the color of the 

 dorsum of the pronotum, and in the dorsum not being alutaceo-rugose, but 

 on the front and posterior lobe is obsoletely punctate, and the lateral lobes 

 being obsoletely variolose. Elytra a little shorter than the body, more 



than twice the length of the posterior femora ; anal and axillary veins free. 

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