434 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loe 



Fornticaricola sanctae-tnartaCf new species 



Figures 7,c; 8,/; 9,a 



Type: Male adult from Formicarius analis virescens Todd, collected 

 by the author at Los Gorros, at eastern base of Sierra Nevada de 

 Santa Marta, Colombia, on Maj- 6, 1945 (USNM). 



Diagnosis: This species resembles costancensis in shape of anterior 

 half of head, the lateral margins being strongly concave, but differs 

 in having much wider frons, much wider and larger anterior plate, 

 which is wider in anterior portion than in posterior section, a character 

 not found on any of the other species taken on F. analis and its races. 

 The eye is very pronounced, as in costancensis, but the carinae con- 

 necting the premarginal nodi with the posterior mandibular condyles 

 are distinct, as well as the anterior condyles. 



The posterior margins of the pterothorax are strongly concave 

 (straight in costancensis). Abdominal segment VII has the same shape 

 as in mexicana, with anterior margin sinuate, but with the lateral 

 angles much less acute; segment VIII is wider in anterior portion 

 than any of the other known males and the margin more circular 

 (fig. 8,/). 



The male genitalia resemble those of costancensis in shape of basal 

 plate, but they resemble jnexicana in the mesosome (fig. d,a-d). 



The species is represented only by the holotype, male. 



Formicaricola beni, new species 



Figures l,d; 7,6; S,h 



Type: Male adult from Formicarius analis analis (d'Orbigny and 

 La Fresnaye), collected by the author at Santa Ana, Rio Coroico, 

 BoUvia, July 26, 1934 (author's collection). 



Diagnosis: The head is decidedly different in shape from all of the 

 other known species, the sides forming a slightly undulating line from 

 temples to the narrow frons; the head also is smaller than in an}' of the 

 other known males, being especially narrow at the temples (0.477 X 

 0.35, with width at coni 0.28); the anterior plate is also the smallest, 

 almost ch'cular in shape, but slightly longer than wide (fig. 7,6). 



The posterior margins of the pterothorax are very different, being 

 deeply emarginate just inside the acetabular bars, then rimning 

 straight to an acute point. The abdomen is more oval in shape, 

 expanding laterally at segments IV to VI; tergites I to V unusually 

 long, with tergites I to III longer than wide; all pleurite "heads" 

 long, especially ventral portion; segment VIII very narrow, with 

 anterior margin convex, and distinctly divided medially, the only 

 species seen with this character; segment IX differs in shape from 

 that of all the other males (fig. 8,A). 



