420 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iog 



Formicaphagus latifrons, new species 



Figures 4,5; 5,h 



Type: Female adult from Cercomacra n. nigricans Sclater, collected 

 by the author at Rio Vicja, Bolivar, Colombia, Feb. 24, 1947 (USNM). 



Diagnosis: One of the larger species, equal in size to F. magnvs, 

 with practically the same head and bod}' measurements except width 

 of head at coni, which is less (0.41 against 0.45). 



The head is wide at tips of premarginal carinae, with prepntennary 

 margin sinuate; anterior plate longer than wide, v.idest at tips of 

 premarginal carinae, from which point sides converge to rounded tips 

 of frons and backward to posterior margin. Premarginal carinae 

 wide, with inner margin irregular in outline; nodi large, witli posterior 

 half much more deeph' pigmented; inner carinae, which support 

 anterior plate, are wide, covering almost half of tliat plate and with 

 the large incrassations reaching the lateral margins. Postmarginal 

 carinae present but fainth' colored; eyes small, with short seta; at- 

 tachment of gular plate to prothorax somewhat unusual (fig. 4,6). 



Head, legs, and thorax pale, translucent brown, with carinae darker 

 brown; abdomen clear, except the large pleurites which are pitchy 

 black dorsalh' and dark umber l^rown ventrally, the ventral portion 

 being much wider than the dorsal portion and with undulating inner 

 margin; "heads" short on dorsum, very long on ventral face, and clear 

 brown. Tergites uncolored, with only genital plate and sternite V 

 visible; lateral portion of VIII light brown. Abdominal setae unusu- 

 ally short, those of genital plate normal; the lateral, sternal setae of 

 VIII are eight in number, short, and all point inward and slight!}'' 

 backward. 



The species is represented by the female holotype only. 



There is a single female from Cercomacra t. tyrannina, collected at 

 Santa Rosa, Bolivar, Colombia, which is so close to the type of 

 latifrons that it seems useless to attempt its separation. All measure- 

 ments are practically the same except width of head at preantennary 

 suture, which is greater (0.38 against 0.365), and abdomen shorter 

 and narrower (never a reliable measurement). The number of 

 ventral setae oji segment VIII is the same. I have, tiierefore, identified 

 this female as F. latifrons. 



Formicaphagus clypeatiis, new species 



Figures 4,c; 5,«?; 6,c 



Types: Male and female adults from Percnostola leucostigma brunnei- 

 ceps (Zimmer), collected by the author at La Pampa, Peru, July 5, 

 1931 (author's collection). 



Diagnosis: One of the smaller species (body, 1.78X0.55; head, 

 0.445X0.445). Body coloring the same as in preceding species. 



