216 PROCEEDINGS OF THE NATIONAL IMUSEUM vol. 99 



One specimen, Bolivia, Huachi, Beni. W. M. Mann, 1922. Miilf ord 

 Biol. Expl., 1921-22. 



Closely related to T. rufovarius Kirsch but distinguished by the 

 color of the posterior legs and by the shape and larger size of the 

 posterior tibiae. 



TACHYGONUS MONTANUS, new species 

 FiGUEE 23 



Black, shiny, rounded subquadrate, with a red, arrow-shaped mark 

 on the elytra (formed by a reddish sutural line, which is branched 

 near the postscutellar patch). 



Prothorax black, shiny, sparsely pitted ; the flanks red and covered 

 by pectinate scales, which are spread along the dorsal and basal edges. 

 Flanks of meso- and metathorax densely clothed with white pectinate 

 scales. 



Rostrum black, but testaceous at tip; the sides pitted. Antennae 

 cream white. 



Elytra black, shiny, with two dense white postscutellar tufts; the 

 interstices raised; terminal part of the suture with a series of about 

 eight pairs of short, yellow, strongly crossed setae. Abdominal seg- 

 ments with white hairs and a few white pectinate scales. 



Anterior and intermediate legs yellowish ; the posterior ones black, 

 with the femora reddish apically, and armed with several small teeth 

 and also with four long teeth, one pair at apical two-sevenths, one 

 tooth at the middle and basad of this a shorter one. Posterior tibiae 

 sinuate, with short, yellowish setae. Hind tarsi with the first segment 

 ferruginous, the rest missing. 



Length 1.73 mm. ; width 1.30 mm. 



7V;>e.— U.S.N,M. No. 58188. 



One specimen, Bolivia, Cosincho, Beni, collected by G. L. Harring- 

 ton. 



Near T. neivai Monte but distinguished by the posterior femora 

 being totally black and narrower at tip. 



TACHYGONUS MIRUS, new species 



Figure 24 



Ferruginous, with dark spots somewhat variable in size and location. 

 Head dark, its dorsal surface with small, somewhat elongate punctures 

 separated by very narrow, longitudinal, more or less cariniform lines, 

 this sculpture less distinct laterally; sides of head with some white 

 pectinate scales. In one of the paratypes the dark color of head is 

 separated by a narrow reddish streak. 



Antennae whitish yellow. Eostrum dark brown, lighter at apex, 

 with strong pitting at base and flanks. Dorsum of prothorax dark, 



