610 CATALOGUE OF 



CYRTACANTHACRIS DIFFERENTIALS. 



Acridium differentiale, U/iler, Trans. III. St. Agric. Soc. v. 450. 

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



CYRTACANTHACRIS CONCOLOR. 



Fcem. Fulva, sat yracilis ; fastigiumplanum, subhexagonale ; prothorax 

 subcarinalus, subtiliter scaber, postice rufescens, tnargine postico 

 producto angulato ; prosterni spina crassa, obliqua^ mesosternum 

 attingens ; tibia poslicce ru/#, spinis pallide flavis apice nigris ; 

 alee anticcB cinerece, corpori cequilongce, venis fulvis basi rufis. 



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

 vertex flat, subhexagonal; 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-defined transverse lines ; fore 

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

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

 sternum. Hind femora as long as the abdomen; hind tibiae red, rather 

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

 cinereous, as long as the body; veins of the fore wings tawny, red towards 

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

 52 lines. 



a. Mexico? 



CYRTACANTHACRIS SIMULATRIX. 



Mas. Fulva, gracilis ; caput et prothorax nigro interrupts bivittata ; 

 prothorax subtiliter scaber, subcarinatus, vitlis duabus exterioribus 

 nigris valde interruptis ; prosterni spina obliqua, subflexa, sat 

 gracilis, mesosternum fere attingens; tibia posticce rufa, spinis 

 albidis apice nigris ; alee anticae diaphance, corpori cequilonga, 

 guttis subcoslalibus playis discoidalibus maculisque exterioribus 

 nigris. 



Male. Tawny, slender. Head and prolhorax 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 much abbreviated black 

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

 interrupted by the transverse impressed marks which are distinctly marked ; 

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

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

 fore border of the mesosternum. 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 tips ; veins whitish, black in the markings. Hind wings 

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

 16 lines; expansion of the fore wings 35 lines. 



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



