ACRIDIDjE. 791 



Male. Body very slender. Head elongate; tip of the vertex flat, 

 subhexagoual, narrowest in front, with a slightly elevated border; lateral 

 furrows triangular; front oblique, long, transversely and slightly rugulose, 

 with four well-defined diverging keels. Antennae filiform, very slender, 

 much more than half the length of the body. Prothorax with three very 

 slight keels; lateral keels slightly diverging hindward ; hind border 

 rounded, not elongated. Legs slender, rather long. Hind femora a little 

 longer than the abdomen. Hind tibiae as long as the hind femora; spines 

 rather long and stout. Wings as long as the body. 



1. CEBACBIS NIGRICOBNIS. 



Mas. Pallide testacea ; caput et prothorax nigro bivittata ; antenna 

 nigrce ; femora postica intus nigro bifasciata ; tibiae postica nigro 

 bifasciatce; alee posticce cinerece. 



Male. Pale testaceous. Head and prothorax with two black stripes ; 

 these begin on the socket of each antenna, are interrupted by each eye, 

 and extend to the hind border of the prothorax. Antennae black. Hind 

 femora with two black bands on the inner side; first band postmedial ; 

 second apical. Hind tibiae with two black bands, one basal, the other near 

 the base; spines with black tips. Hind wings cinereous; veins black. 

 Length of the body 12 lines ; expansion of the fore wings 26 lines. 



a. North Hindostan. From Dr. Hooker's collection. 



Genus 25. MASTAX. 



Mastax, Perty, Del. An. Art. 123. Serv. Hist. Orth. 750. Burm. Handb. 

 Ent. ii. 652. Westw. Arc. Ent. 



1. MASTAX TENDIS. 



tenuis, Perty, Del. An. Art. 123, pi. 24, f. 3. Serv. Hist. Orth. 750. Burm. 

 Handb. Ent. ii. 653. 



Brazil. 



2. MASTAX MUTILATA 

 mutilata, Serv. Hist. Orth. 751. 

 Colombia. 



3. MASTAX AGBIONOIDES. 



Acridium (Mastax) agrionoides, Haan, Verz. Gesch. Ned. Ind. Bez. Ins. 

 163, pi. 22, f. 2 Mastax apicalis, Westw. Arc. Ent. pi. 26, f. 1. 



Sumatra. Borneo. 



