364 Annals of the Carnegie Museum. 



Santa Cruz, Bolivia, at an elevation of 1,200 meters above sea-level, 

 where they were taken by Steinbach during the month of December, 

 1913. They form part of Accession No. 5016. These insects, while 

 immature, show that they are quite distinct from the three known 

 black forms, since the antennae are all white except the two apical 

 joints which are black. Their extreme southern habitat, together 

 with the entire absence of records of similar forms from intervening 

 localities seems to point to their distinctness. These insects are like- 

 wise preserved in the entomological collections of the Carnegie 

 Museum. 



17. Rhipipteryx circumcincta Saussure. 



Rhipipteryx circumcincta Saussure, Miss. Mex. (1874), p. 358; Kirby, Syn. Cat- 

 Orth., II (1906), p. 12. 



Habitat. — Four specimens are at hand. Three of them come from 

 Benevides, Brazil, where they were taken by H. H. Smith during the 

 month of July, and the fourth bears the label "Para." It was also 

 collected in July and presumably by H. H. Smith. 



18. Rhipipteryx boliviana sp. nov. 



Almost the maximum in size for the genus. A very striking insect 

 in appearance, since it is prevailingly dirty white or pale gray in color. 

 The pronotum is marked with dashes and dots of black to the number 

 of eight as follows: a longitudinal, large wedge-shaped line, the point 

 in front, on the middle of the disk, extending from near the hind 

 margin a little more than halfway towards the front; a moderately 

 large transverse elliptical patch on each side, about midway between 

 the posterior and anterior margins; and a series of five patches 

 parallel to the anterior edge, the one in the middle a mere dot, the 

 others larger. Anterior tibiae rather broadly and deeply sulcate on 

 their inner face. Last ventral abdominal segment of the abdomen of 

 the male black, elongate, prow-shaped, with the apex finely acuminate, 

 preceded by a raised keel, on the sides of which are two roundish 

 protuberances. Cerci, or what seem to be such, white, with dusky 

 apex, rather long, slightly enlarged apically, and rounded, the lower 

 apical edge provided with a long, slender, black spine. A second, but 

 much slenderer and shorter, i^air of stylets in advance of these, black. 

 Abdominal segments very broadly white-margined. Legs dirty white, 

 except for the infuscated knees and somewhat darkened apex of the 



