510 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxix. 



is distinctl}' curved; internal niar^'ins irre<^ulai'ly serrato-dentate. 

 Femora short, strongly inflated, particidarly the cephalic and median 

 pairs; tarsi with narrow transverse arolia present. 



General coloi- burnt umber, pale on the tarsi and very dark, almost 

 blackish, on the abdomen; antenna) rather pale at the tips. 



Measurements. 



mm. 



Length of body (exclusive of forceps) 15. 5 



Length of pronotiun 3. 1 



Length of tegmen 5 



Length of anal segment 2 



Greatest width of anal segment 4.5 



Length of forceps 9.5 



The type is unique. 



Genus ANCISTROGASTER Stal. 

 ANCISTROGASTER FALCIFERA, new species. 



Type.—M?i\Q\ Piches and Perene valleys, Peru, 2,000-3,000 feet. 

 (Soc. Geog. de Lima.) [Cat. No. 8172, U.S.N.M.] 



Allied to A. variegata Dohrn from Venezuela, but differing in the 

 brownish-black color of the terminal abdominal segments and the red- 

 dish lateral margins of the pronotum. 



Size medium; form, as usual in the genus, depressed; surface sup- 

 plied with short closely placed hairs. Head 

 distinctl}^ but moderately inflated between the 

 eyes and bearing a pair of deep median punc- 

 tures, caudal section depressed; caudal mar- 

 gin truncato-emarginate, caudo-lateral angles 

 rounded; ej^es rather large, considerably pro- 

 jecting; antenna? with nine joints present, the 

 proximal joint long, slender, tapering proxi- 

 mad, second joint minute, third joint slightly 

 more than half the length of the first, fourth 

 subequal to the third, fifth joint nearly as long 

 as the first, the remaining joints similar to the 

 fifth, but each slightly increasing in length over 

 the next proximal one. Pronotum subciuadrate, 

 '"'*'■ '■"^tFE™xT'''''" small, slightly narrower than the width of the 

 head across the eyes, lateral and caudal margins 

 arcuate, the caudo-lateral angles broadly rounded, cephalo-lateral angles 

 narrowly rounded; lateral portions of the pronotum with depressed 

 longitudinal areas near the lateral margins and slightly converging 

 caudad, median transverse depression shallow, broad, present between 

 these lateral areas, longitudinal median sulcus distinct only cephalad, 

 Tegmina about two and a half times the length of the pronotum, broad, 

 the "shoulder'- angles moderately rounded, caudal margins truncate. 



