I ; k i n i k : South American Locusts. 457 



Family GEDIPODID 1 (LOGUSTID I i! 



The eld family GEdipodidae (now Locustidse) is bu1 poorlj repre- 

 sented in South American countries. Most of its representatives are 

 to be met with either on the more elevated portions of the Ai 

 chain or the arid and semiarid portions of Chile and Argentina. The 

 collections now being studied contain but four forms. 



Genus Dissosteira Scudder. 



Dissosteira Scudder, Wheeler's Ann. Rept. Geol. and Geogr. Surv., W. iooth Merid., 

 Append. JJ., p. 291 (1876). 



54. Dissosteira Carolina (Linnaeus). 



Gryllus (Locusta) carolinus Linnaeus, Syst. Nat. (Ed. x), I, p. 433, n. 51 (1758). 

 Acrydium carolinum DeGeer, Mem. Ins., II, p. 491, pi. 41, figs. 2, 3 (1773). 

 Gryllus carolinus Fabricius, Syst. Ent., p. 291, n. 22 (1775). 



An extended synonymy is given in Kirby's Synonymic Catalogue 

 of Orthoptera, III, pp. 231-232 (1910). 



Habitat. — This insect is mentioned in the present paper on the 

 strength of a fully grown nymph bearing the label "Jamaica, W. I." 

 It is a portion of the Carnegie Museum accession number 2306. 



This specimen must be accidental on that island, since I find no 

 former reference to this locust having been taken in the West Indies 

 or South America. 



Genus Lactista Saussure. 



Lactista Saussure, Mem. Soc. Geneve, XXVIII, no. 9, pp. 54. 102 (1884); Ib., 

 1. c, XXX, no. 1, p. 20 (1888); Bruner, Biol. Cent.-Amer., Orthopt, II, pp. 

 116, 167 (1905)- 



55. Lactista australis sp, nov. 



A moderately robust insect with pale yellowish hyaline disk on 

 wings. Most closely related to the L. pulchripennis of Saussure, but 

 decidedly smaller. 



Body compressed, but deep and robust about the thorax. Pronotum 

 rather strongly rugose above and somewhat less so at hind margin of 

 sides, with a strong cristate median carina, which is profoundly cut by 

 the hind transverse sulcus plainly in advance of the middle; posterior 

 lobe strongly divergent caudad, the hind margin of the disk very 

 gently acute-angled in the male and a trifle obtuse-angled in the 

 female; lower posterior angle provided with a well-defined downwardly 



