ACRIDIDiE. 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 hiudward ; hind border 

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

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

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



1. Ceracris nigricornis. 



Mas. Pallide testacea ; caput et prothorax nigra bivitlata ; anteniKB 

 nigrce ; femora postica ititus nigra bifasciata ; libice posticce nigra 

 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 postniedial ; 

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

 the base; spines with black lips. 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, Perti/, Del. An. Art. 123. Serv. Hist. Orth. 750. Burm. Handb. 

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



1. Mastax tenuis. 



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

 Handb. Ent. ii. 653, 



Brazil. 



2. Mastax mutilata 

 luutilata, Serv. Hist. Orth. 751. 

 Colombia. 



3. Mastax agrionoides. 



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

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



Sumatra. Borneo. 



