418 PROCEEDINGS OF THE NATIONAL :MLTSEUM vol. loe 



Abdomen quite clear, but tergites and sternites more clearly defined 

 than in many species; pleurites dark brown, blacker in the male, and 

 with ventral portion twice the width of the dorsal (more than twice 

 in female); pleurites in segment I well defined but not deeply pig- 

 mented; the "heads" are short and rounded on dorsal portion, longer 

 on ventral portion and with the attenuated tips curving outward. 



The marginal setae of the genital plate in female are longer and set 

 closer together than in the preceding species; the setae at posterior, 

 inner corner of tergites are very long, as well as the single, pustulated 

 seta on posterior margin of tergites III to VII, just inside the pleurites. 

 The sternal setae at sides of VIII are also long and slender, some as 

 long as mdth of segment, and average seven in number. 



In the male the setae of the abdominal tergites and of segment VIII 

 are also unusually long; the genitalia are small, the basal plate being 

 short with broad, rounded apical end; parameres globular, with 

 narrow, deeply pigmented marginal carina; mesosome very simple, 

 but portions not clearh' visible (fig. Q,d). The species is represented 

 by male holotype, female allotype, and one male and five female 

 paratypes. 



Formicaphagus hiiilae, new species 



Figures 4, a; 6,h 



Type: Female adult from Myrmeciza longipes boucardi Berlepsch, 

 collected by the author at La Plata, Huila, Colombia, Apr. 10, 1952 

 (USNM). 



Diagnosis: A medium sized species (body 1.60 X 0.43; head 

 0.425 X 0.423), strikingly colored. The head, thorax, and legs are 

 pale, clear brown; the carinae of head and legs darker brown, while 

 those of thorax are almost pitchy black; the abdomen is uniformly 

 translucent, excepting the pleurites, genital plate, and lateral margins 

 of segment VIII; the pleurites are rather wide, pitch}^ black, slightly 

 wider ventrally in posterior portion, and sharply defined on inner 

 side; the "heads" are short dorsallj^ and bluntl}^ pointed, but twice 

 a« long ventrally and faintly colored; genital plate and margins of 

 segment VIII pale brown; sternite V is faintl}^ visible, and all sternites 

 are clearh* and widely separated from pleurites. The setae of genital 

 plate are normal, rather abundant, and thickened basally; ventral 

 setae on sides of segment VIII are rather short and slender, six in the 

 row parallel to margin and pointing inward, with two near margin, 

 pointing backward. 



The species is represented by the female holotype and two female 

 paratypes. 



Figure 3. — Head, thorax, and certain abdominal segments of female: a, Formicaphagus 

 splendidus (segment I); b, F. grallariae (segments I-III); c, F. minuius (segments I-III); 

 d, F. thoracicus (segments I, II). 



