41 



pressed, well rounded, the portion posterior to them sharply serrulate. 

 "Wings pea green, with roseate veins on the posterior half, and per- 

 haps slightly washed with roseate in this same portion. Outer side 

 of the hind femora ornamented Avith a row of (apparently) quadrate 

 whitish spots ; spines on the upper half of the hind tibioB tipped very 

 slightly with black ; those on the lower portion more distinctly. 



Expanse of tegmina, 9 194 '""•. 



Guayaquil. Prof Orton. 



We can give but slight credence to the statements of the earlier 

 authors concerning the home of the insects which they describe ; and 

 the same uncertainty and confusion of habitat, on a lesser scale, 

 seems to have clung to these up to the present time. The species of 

 the genus Tropidacris were indiscriminately located over the whole 

 of northern South America, whereas it appears, by the sifting of evi- 

 dence, that, with the exception of one (T. cristata)^ which is some- 

 what unique in its chai'acters, and extends over the whole Brazilian 

 coast, and to a certain degree into the interior, they are each charac- 

 teristic of a sepai-ate zoological province, T. Fahricii being found on 

 the Brazilian coast from Rio to Para, T. Latreillei in the interior, T. 

 dux upon the isthmus of Panama and the surrounding region, and T. 

 rex on the west coast. With the exception of the interior of Brazil, 

 each of these provinces also harbors one species of Lophacris, viz.: 

 L. Olfersii on the Brazilian coast, L. Velasquezii in Mexico, and L. 

 Humboldtii in Ecuador. The genus Titanacris does not seem to fol- 

 low the same rule ; the special habitat of T. carinata has never been 

 given, while that of T. albipes is on the Brazilian coast, specimens 

 having been quoted from Rio, Lago Alexo, Para and Surinam. 



I am indebted to the Museum of Comparative Zoology, the Pea- 

 body Academy of Science and this Society, for most of the material 

 used in this study. 



