610 catalogue of 



Cyrtacanthacris diffebentialis. 

 Acridiutn differentiale, UlUer, Trans. III. St. Agric. Soc. v. 450. 

 a. Illinois. Presented by F. Walker, Esq. 



Cyrtacanthacris concolor. 



Fcem. Fulva, sat gracilis ; fastigium planum, subhexagonale ; prothorax 

 subcarinalut, subliliter scaber, postice rufescens, margine postico 

 produclo angiilalo ; prosterni spina crassa, obligua, mesoslernum 

 atlingfiis ; tibia posiicce rufte, spinis pallide Jlavis apice nigris ; 

 alte anliccB cinerece, corpori cBquilongcE, venis fulvis basi rujis. 



Female. Tawny, rather slender. Head short, smooth ; tip of the 

 vertex flat, subhexa<(onal ; front thickly punctured; the four keels well 

 defined, diverging towards the face. Eyes elongate-elliptical. Antennae 

 slender, cylindrical. Prothorax finely scabrous, reddish towards the hind 

 border, with a slight keel and with four well-dtfined transverse lines ; fore 

 border and siiies slightly rounded ; hind border elongated, angular. Pro- 

 sternal spine thick, oblique, rounded at the lip, extending to the meso- 

 slernum. Hind femora as long as the abdomen; hind tibine red, rather 

 shorter than the hind femora ; spines pale yellow, with black lips. Wings 

 cinereous, as long as the l)0(ly; veins of the fore wings tawny, red towards 

 the base. Length of the body 24 lines; expansion of the fore wings 

 62 lines. 



a. Mexico? 



Cyrtacanthacris simulatrix. 



Mas. Fulva, gracilis ; caput et prothorax nigro interrupte bivittala ; 

 prothorax subliliter scaber, subcarinatus, vittis duabus exterioribus 

 nigris valde inlerritptis ; prosterni spina obliqua, subjlexa, sat 

 gracilis, mesoslernum fere attingens ; tibice posliccB rufa, spinis 

 albidis apice nigris ; alee unticm diaphana, corpori cequilongce, 

 gutlis subcostatibus plagis discoidalibus maculisque exterioribus 

 nigris. 



Male. Tawny, slender. Head and prothorax with two slender 

 interrupted black stripes. Head smooth ; fore part of the vertex depressed, 

 hexagonal ; front largely punctured, with four well-defined keels which 

 diverge slightly towards the face. Eyes ferruginous, elliptical. Prothorax 

 finely scabrous, with a slight keel and with two ranch abbreviated black 

 stripes in addition to the inner pair before mentioned; keel not rounded, 

 interiu|>ted by the transverse impressed marks which are distinctly marked ; 

 fore border and sides slightly roinided ; hind border much rounded. Pro- 

 sternal spine oblique, rather slender, slightly bent, extending nearly to the 

 fore border of the mesoslernum. Hind femora as long as the abdomen; 

 hind tibiae red, a little shorter than the hind femora ; spines whitish, with 

 black tips. Fore wings pellucid, as long as the body; markings blackish ; 

 a row of dots along the costa; some large patches in the disk and some 

 spots towards the lips; veins whitish, black in the markings. Hind wings 

 pellucid; veins black, lawny towards the base. Length of the body 

 16 lines; expansion of the fore wings 35 lines. 



a. St. Domingo. From Mr. Tweedie's collection. 



