Mr. W. L. Distant on Ilomoptera. 77 



Aulacizes insistans. 



Proconia insistans, Walk. List Horn., Suppl. p. 232 (1858). 

 Aulacizes obtusa, Walk. loc. cit. p. 239. 



Hab. Rio Janeiro. 



Aulacizes annuligera. 

 Proconia annuligera, Walk. List Houi., Suppl. p. 232 (1858). 



Hab. Rio Janeiro. 



Aulacizes consjiersa. 



Aulacizes conspersa, Walk. List Horn. iii. p. 792 (1851). 

 Var. Proconia persistans, Walk. loc. cit., Suppl. p. 231 (1858). 



Hab. Rio Janeiro. 



Mareba, gen. nov. 



Vertex broad, robust, as long as breadth between eyes and 

 as long as the pronotum, centrally longitudinally depressed, 

 a distinct foveation near each ocellus, subconically produced 

 in front, narrowing from eyes to apex ; face elongate, longi- 

 tudinally broadly flattened and depressed from near base to 

 clypeus ; clypeus scarcely or not elevated ; pronotum rugu- 

 lose and coarsely punctate, the basal margin somewhat 

 prominently concavely sinuate in front of scutellum, nar- 

 rowing from base to apex, the lateral margins oblique ; 

 scutellum subtriangular, its apex slenderly acutely produced ; 

 tegmina short and broad, scarcely longer than abdomen, their 

 apices rounded ; legs somewhat short and robust, the anterior 

 tibise sulcate. 



Type, M. eresia, Dist. 



Allied to Aulacizes, and including the Aulacizes insignior, 

 Fowl. The figure of the latter species in the ' Biologia ' is 

 structurally inexact, being much too elongate ; it represents 

 the tegmina as being nearly twice as long as the vertex, 

 pronotum, and scutellum taken together, whereas in the 

 unique type they are only about one-fourth longer. 



Mareba eresia, sp. n. 



Above brownish ochraceous ; body beneath somewhat pale 

 ochraceous ; central longitudinal disk of the face black • 

 legs piceous, apices of the femora castaneous, posterior tibire 

 ochraceous ; more than apical third of the tegmina piceous 

 black, with small obscure ochraceous spots, the apical 



