ORTALID^E — SYSTEMATIC DISTRIBUTION. 67 



It was founded by Rob. Desvoidy, and Setellia alra Rob. Desv. 

 must be considered as its type. I have not seen this species, and, 

 unfortunately, the statements of Rob. Desvoidy are not sufficient 

 to enable me to decide whether Setellia alra belongs to the 

 Riehardina or to the Cephalina. In the same way, I am unable 

 to decide whether the Brazilian species, subsequently described 

 by Macquart as Setellia apicalis really belongs in the same genus 

 with Setellia alra. As Rob. Desvoidy does not allude at all to 

 the femora of his species being spinous, while Macquart's species 

 is remarkable for all its femora being armed in a rather striking 

 manner, it becomes exceedingly doubtful whether Macquart's 

 species is a Setellia in the sense of Rob. Desvoidy's. 



I do not know of any species more related to Setellia apicalis 

 Macq. than that species from Colombia, South America, which 

 Gerstsecker described under the name of Miehogaster egregius. 

 As its first longitudinal vein is bare and its femora are armed, 

 it cannot possibly remain connected with the true species of 

 Mischogaster, but must be considered as the type of a separate 

 genus of Riehardina, for which I propose the name of Euolena. 

 To place Setellia apicalis in the genus Euolena is not possi- 

 ble ; it has no stump of a vein upon the second longitudinal vein 

 inside of the submarginal cell, a character distinguishing Euolena 

 egregia; its third and fourth longitudinal veins converge more 

 distinctly towards their end, and the posterior angle of the anal 

 cell is not rounded. Setellia apicalis will also have to be con- 

 sidered as the type of a separate genus, which may be called 

 Syntaces. In the supposition that the first longitudinal vein of 

 Syidaces apicalis, like that of its relative Euolena egregia, is 

 bare, I think that the best location for this genus is among the 

 Riehardina, It is true that the posterior angle of the anal cell, 

 in Macquart's figure, is almost acute; in the generic diagnosis, 

 however, he calls the anal cell : "termince carrement," so that the 

 shape of this cell cannot be an obstacle to the location of the 

 genus among the Riehardina; and this view is supported by the 

 spinous femora, a character common to nearly all the genera of 

 this group. Should, however, the first longitudinal vein of Syn- 

 taces be hairy or bristly, then the location of the genus among 

 the Riehardina would be impossible. 



Next to Euolena is the genus Idiotypa, which I establish for 

 a new species from Cuba. In its general habitus it is almost 



