MORGAN HEBARD 167 



of general type found in Bradynotes, small furcula present as in 



two of the species of that genus. Female ovipositor valves fully 



exposed. 



Argiacris rehni 28 new species (Plate VIII, fig. 18.) 



This distinctive insect is obscurely colored, except for the bril- 

 liant pink of the internal faces of the caudal femora ventrad and 

 of the caudal tibiae. 



Type. — cf ; Livingston, Park County, Montana. Elevation, 

 5000 feet. July 29, 1909. (Rehn and Hebard.) [Hebard Col- 

 lection, Type No. 480.] 



Size large, form very robust. Head with interocular space half as wide as 

 length of one of the eyes; eye small, moderately protuberant, three-quarters 

 as long as cheek. Pronotum with disk moderately convex; medio-longitudinal 

 carina weakly defined only on metazona; transverse sulci not deep; caudal 

 margin broadly obtuse-angulate produced with apex broadly rounded. Teg- 

 mina very broadly lanceolate, considerably shorter than pronotum, sutural 

 margins attingent proximad (in the series varying from slightly overlapping 

 to separated by a brief interval), apices acute and sharply rounded. Furcula 

 represented by two minute rectangulate projections with angles rounded, 

 separated by a space slightly wider than one of these projections. Supra-anal 

 plate simple, triangularly shield-shaped, lateral margins convergent and feebly 

 convex to the rather acute apex; surface concave each side of the medio- 

 longitudinal sulcus, which is bounded by rather decided lateral carinae to near 

 the apex of the plate. Cercus simple, about two and one-half times as long 

 as basal width, tapering decidedly in proximal half, distal half showing a 

 moderate flexure dorsad, widening very feebly then very slightly and gradually 

 narrowing to the broad, rounded apex. Subgenital plate of the general type 

 usual in Bradynotes, but with an acute-conical projection meso-dorsad on the 

 free margin. Prosternal spine short, heavy, acute-conical. Interspace between 

 mesosternal lobes distinctly longer than least (proximal) width. Limbs robust. 



Allotype. — 9 ; same data as type. [Hebard Collection.] 

 Similar to male except in the following features. Size larger, form more 

 robust. Interocular space with width about two-thirds length of eye. Eye 

 about three-fifths as long as cheek. Tegmina separated by a brief interval 

 (width of this interval individually moderately variable). Ovipositor valves 

 fully exposed. Prosternal spine very short and heavy, with apex acute and 

 sharply rounded. Interspace between mesosternal lobes with length contained 

 about one and one-third times in least width. 



28 In honor of our friend and fellow-worker, Mr. James A. G. Rehn, for whom 

 both personally and scientifically we have the highest regard. 



TRANS. AM. ENT. SOC, XLIV. 



