24 Annals of the Carnegie Museum. 



lower edge but little sinuate, the last transverse sulcus situated about 

 the middle, it alone severing the median carina; posterior margin of 

 disk obtusangulate. Tegmina of moderate width, the costal margin 

 only gently lobate near the base, the apex rounded, the middle area 

 without a well-defined intercalary vein. Wings, even of male, lacking 

 the fenestrate area so prominent in Truxalis, Orphula, and their allies, 

 in this respect resembling Amblytropidia, to which group it belongs. 



28. Leurocerus linearis (Rehn). 

 Cocytotettix linearis Rehn, Proc. U. S. Nat. Mus., XXX, p. 374 (1906). 



Habitat. — Chapada, near Cuyaba, Matto Grosso, Brazil, April to 

 September, numerous specimens of both sexes (H. H. Smith). 



This insect is more closely related to Amblytropidia than to Cocyto- 

 tettix. 



Genus Amblytropidia Stal. 



Amblytropidia Stal, Recens. Orthopt., I, pp. 93, 107 (1873). 



The genus Amblytropidia is confined to the New World, where its 

 representatives are found from the southern United States to central 

 Argentina. The majority of its species, however, occur in the tropical 

 portions of both North and South America, where they are to be met 

 with in savannas or grassy openings in the forests, and to some extent 

 in the forests themselves. At least eighteen distinct species of the 

 genus have already been discovered. As in several other truxaline 

 genera, the species of this genus are rather closely related and some- 

 what difficult to separate. The annexed synoptic table will, it is 

 hoped, assist the student in determining the described forms: 



Synopsis of the Species of Amblytropidia. 

 I Median carina of the vertex quite prominent. Last transverse sulcus of the 

 pronotum situated plainly behind the middle. 

 b. General structure, especially of the females, quite robust; the majority of 

 species rather pale-colored. Tegmina of females, as a rule, not, or 

 but little, surpassing the tips of the hind femora, in some instances 

 a little shorter than the abdomen. The latter concolorous above. 

 c. Antennae of female (those of the male always relatively longer) a trifle 

 longer than the head and pronotum combined. Tegmina pro- 

 vided with fuscous spots. 



</. Smaller. [Brazil.] ferruginosa Stal 



dd. Larger. Hind tibiae with thirteen spines in the outer row. [Central 



America, Guatemala.] magna Bruner. 



cc. Antennas of female no longer, often noticeably shorter, than the combined 

 length of the head and pronotum. Tegmina variable. 



