282 OETHOPTEEA. 



[4. Omalotettix chapadensis, sp. n. 



The characters given in the synoptic table, together with the more elongate cerci of the males, will enable one 

 to recognize the species should it be found to occur in our region. 



Hab. S. Brazil, Chapada.] 



[5. Omalotettix caeruleipennis, Bruner. 



Jodacris (?) caruleipennis, Bruner, Locusts of Argentina, p. 68 (1900) \ 

 Omalotettix caruleipennis, Bruner, Proc. U.S. Nat. Mus. xxx. pp. 673, 674s (1906) 2 . 



Hab. South America, Paraguay, Argentina, and Brazil 1_2 . 



Both the present species and 0. conspersipennis, which is briefly characterized in 

 the synoptic table as No. 6, seem to be more restricted in their distribution and may 

 not reach Central America.] 



CHRYSOPSACRIS, gen. nov. 



The present genus is based on several species of medium-sized tropical locusts that 

 occur in portions of northern South and Central- American countries, Gryllus bucephalus, 

 Marschall, being taken as the type. As will be seen by an examination of the 

 synonymy and remarks given under C. bucephala, some confusion seems to have arisen 

 as to which of several insects is the one that was described by Marschall. 



The generic characters are given in the synoptic table of the genera of the subfamily 

 Acridiinse on page 215, and in connection with the description of C. atrocephala which 

 follows. 



Synopsis of the Species of Chrysopsacris. 



A 1 . Prevailing colour of insect testaceous, ferruginous, and fuscous. 

 The tegmina and wings of males nearly as long as the abdomen. 

 b 1 . Sides of head below the eyes and lower half of pronotum pallid. 

 Tegmina conspersed with fuscous ; the hind femora plainly 



fasciate 1. bucephala, Marsch. 



b 2 . Sides of head below the eyes and lower half of pronotum con- 

 colorous. Tegmina immaculate ; the hind femora ferruginous, 



without transverse bands [2. atrocephala, sp. n.] 



A 2 . Prevailing colour of insect green. The tegmina and wings of the 



males two-fifths the length of the abdomen 3. costaricensis, Rehn. 



1. Chrysopsacris bucephala, Marschall. 



Gryllus Bucephalus, Marschall, Ann. Wien. Mus. i. p. 217, t. 18. fig. 9 ( <?) (1836) \ 

 [Nee Bucephalacris bucephala, Gig.-Tos, Zool. .Tahrb. viii. p. 813 (1895) ; Boll. Mus. Zool. Anat. 

 Oomp. Torino, ix. no. 184, pp. 30, 31 (1897).] 



Hab. South America, British Guiana (coll. L. Bruner) ; Bkazil 1 . 



