104 PRODROMUS OKDIPOmORUM. 



17. Genus Tropidolophus, Thom. 

 Tropidolophus, Thomas, Acrididse of North-America, 1873. 



Corpus sparse verruculosum. Tempora nulla, in plano verticali laterali jacentia. 

 Costa facialis lseviuscula, canaliculata, in fronte cf quam infra ocellum lalior. Oculi 

 prominnli, elliptici, minores. Alarum vena discoidalis haud furcata; area furcae venae 

 medise lata, scalari-venosa, apice polygonali-reliculata. Vense radialse ut consuete 

 rectae '. — Femora postica gracillima. Arolia minuia. 



A genere Pyrgodcra vix separandum, et quammodo repetitionem hujus typi in 

 formam Arnericanam sistens. 



1. T. formosus, Say. — Gryllus fdrmdsus, Say, Amer. Ent. (Ed. Le Conte) I, 78; 

 Pl. 34, f. 8. — Tropid. formosus, Thom. Acrid. I3<S. 



Lsle viridis. Caput antice et infere pronotumque sparse granosa; in crista, prse- 

 cipue prozonae conferlim alhido-verrucosum ac granosum; cristae margo superior 

 valde arcuatus, in medio per incisuram in partes 2 divisus, parte postica vakle denli- 

 culata, parte anlica crenulata; crista in prozona tota lamellaris, utrinque costam verti- 

 calem ohferrens, in melazona basi tumescens, margine lamellari; ejus latera in cosla 

 prozonae et in medio ad sulcum typicum dentato-verruculosa, lasciisque 2 verticalibus 

 luleis. Sulcus typicus in lohis lateralibus valde impressus, ad dorsum C-formiter arcua- 

 tus, in crista tenuis, obsoletus. — Pronotum de reliquo plus minus luteo-pictus; lobi 

 laterales in prozona nitidi, fusco-plagiali, fascia obliqua lutea. — Elylra punctis vel 

 maculis nonnullis fuscis in loco consueto fasciarum conspersis. apice submembranaceo 

 sat irregulariter reticulato. — Al;e late miniatse vel sanguineae, apice vilreo, nec non 

 fascia obsoleta fusca, plus minus evanida; area media quam area ulnari dimidio 

 angustiore. — Femora postica viridi-fasciata, latere externo in carinulis angulatis 

 polito-granoso. Tibise post. sanguinere. — Var. Alarum fascia fusca in venis rufo- 

 radiata, antice evanida. — Long. q* 32: El. 31 mill. — Amer. boreal.; Colorado. 



1 Page 49 (9,9), nous avons dit : i vcn/r radiaUr flexuosm. » Cest la nne erreur provenant <le 

 1'examen d'un individu ayant sejourne dans l'alcool 0< >nt les nervures alaires etaieut deformees. 



