430 PROCEEDINGS OF THE ACADEMY OF [Oct., 



Allied to A. australis Brunei", but differing in the glaucous caudal 

 tibiae, the less inflated and more tapering caudal femora, the more 

 sharply defined and more decidedly sulcate frontal costa in both sexes, 

 this being narrower dorsad in the new form, and in the facial outline 

 being truncate between the antennae, this being more decided in the 

 male than in the female. 



Size rather small ; form moderately slender. Head with the dorsal 

 length equal to ( cT ) or slightly less than ( 9 ) the dorsum of the pro- 

 notum; occiput considerably ascending to the interocular region, 

 slightly arcuate in the male, hardly so in the female, the interocular 

 region elevated considerably dorsad of the dorsum of the pronotum; 

 fastigium distinctly but not greatly arcuate declivent, the fastigio- 

 frontal angle rounded obtuse, fastigium slightly acute-angulate in both 

 sexes when viewed from the dorsum, distinctly but shallowly excavate; 

 lateral foveolse well impressed, elongate, subtrigonal, the apex blunt, 



Fig. 9. — Ageneotettix sierranus n. sp. Lateral view of male type. (X 5.) 



cephalad, the caudal width but little exceeding half the length; facial 

 fine considerably retreating ventrad and distinctly subtruncate and 

 vertical from the fastigio-facial angle to a point directly cephalad of 

 the insertion of the antenna? ; frontal costa with the margins regularly 

 diverging caudad with a hardly appreciable constriction in the vicinity 

 of the ocellus, distinctly sulcate dorsad and mesad and shallowly so 

 ventrad; eyes moderately prominent in the male, hardly so in the 

 female, elliptical reniform in outline, in length about twice (cT) or 

 half again (?) as long as the infraocular sulcus ; antennae equal to 

 ( 9 ) or slightly exceeding (c?) the head and pronotum in length, 

 slightly depressed, the apices acuminate. Pronotum with the greatest 

 dorsal width about four-fifths the length, the dorsal line of the same 

 slightly depressed mesad when seen from the side; cephalic margin 

 angulato-truncate, caudal margin broadly obtuse-angulate, the imme- 

 diate angle well rounded in the female; median carina distinct 



