370 Annals of the Carnegie Museum. 



Habitat. — Two females, one macropterous, the other brachypterous, 

 coming from Don Diego (lOO ft. above sea level), Dept. of Magdalena, 

 Colombia, were collected b}' H. H. Smith. 



Whether or not the present species has the aquatic habits described 

 in connection with the following one, the writer cannot say. 



26. Nemobius aquaticus sp. nov. 



Very closely related to the preceding species both in size and color, 

 but d'fferinT; from it in never being macropterous so far as the material 

 at hand would indicate. It also differs from meridionalis in having 

 longer and heavier posterior femora, in bein ; more robust, in having a 

 heavier ovipositor, which is very gently bent downwards, instead of 

 with a similar upward apical curve, as in the type of that species. It 

 possibly is only a form of meridionalis. 



Length of body, cf , 9.5 mm.; 9 , 10.5 mm.; of pronotum, cf , 1.75 

 mm., 9 , 2 mm.; width of same, cf , 2.9 mm., 9 , 3 mm.; length of 

 tegmina, cf and 9 , 6 mm.; of hind femora, cf , 7 mm., 9 , 8 mm.; of 

 ovipositor, 4.5 mm. 



Habitat. — Very abundant among the floating aquatic plants growing 

 in the Rio de la Plata and along its margins in pools at Buenos Ayres 

 where it was collected during the summer of 1898. It had the habit 

 of very commonly diving below the surface when pursued, and 

 remained hidden among the floating plants for several minutes at a 

 time before again venturing into the air to jump and run about on 

 the stems and leaves of the aquatic plants, which afforded it protec- 

 tion. It also readily took to the open water and swam freely, as if 

 this were a regular pastime. 



27. Nemobius longipennis Saussure. 



Nemobius longipennis Savssvre, Miss. Mex., Orth. (1874), P- 3^3; Kirby, Syn. Cat. 

 Orth., II (1906), p. 20. 



Habitat. — A number of specimens of a rather large macropterous 

 Nemobius in the material now being reported upon are referred to 

 longipennis of Saussure. This reference has been made after a com- 

 parison with several specimens obtained in Argentina, which appear 

 definitely to be Saussure's species. The material at hand comes from 

 the following localities: Puerto Suarez, 150 M., Santa Cruz de la 

 Sierra, 450 M., and Provincia del Sara, Bolivia, 450 M. (J. Steinbach); 

 Corumba, lowland, March, and Rio San Laurengo near Corumba 



