270 U.S. NATIONAL MUSEUM BULLETIN 261 



apically; connective Y-shaped with arms widely divergent, each almost 

 as long as stem; aedeagus curved gradually posterodorsally, with pair 

 of lateral processes and a median apical process (lateral processes 

 often longer than in fig, 249); anal tube with an unpaired median 

 process in basal half and a pair of sclerites at base. Female unknown. 

 Ground color of crown, anterior margin of pronot\im, and scutellum, 

 brown, each marked with black, the most conspicuous marking being 

 an apical Y-shaped mark on crown; disc of pronotum dull greenish, 

 minutely vermiculate with black; forewings hyaline except for a stig- 

 malike anteapical costal spot and commissural margins of clavus, both 

 of which are fuscous-greenish; face yellow, apex of clypellus and lower 

 portion of clypeus broadly black, the clypeal marking with a median 

 dorsal extension, with an incomplete marginal black line extending 

 anteriorly from each eye. 



Holotype male, Rio Huallaga Valley, 500 m., Huanuco, Peru, 

 Feb. 22, 1954 (F. L. Woytkowski), on indefinite loan to USNM 

 from NCS; and four topotypes (NCS). Additional specimens have been 

 studied from Rio Tapiche, Peru; Blancaflor, Bolivia; and Itaituba, 

 Brazil. 



This species is closely related to A. obscurior (Fowler) and A. flammeicolor 

 (Fowler), from both of which it can be distinguished by the shape of 

 the aedeagal apex. 



Acrogonia stylata, new species 

 Figure 252 



Length of male 10.9 mm. Head with median length of crown approxi- 

 mately two-thirds transocular width, disc strongly concave, clypeus 

 concave or convex dorsally, face pubescent below; other head char- 

 acters as in A. terminalis, new species. Pronotum and fore wing as in 

 A. terminalis. Male with pygofer slightly concave on posterior margin; 

 plates separate throughout their length, each abruptly narrowed in 

 basal half, not elongate; styles extending much farther posteriorly 

 than apex of connective, each without preapical lobe, curved and 

 acute at apex; connective Y-shaped, with stem about equal in length 

 to arms; aedeagal shaft nearly straight, dorsal margin acute at apex, 

 with a pair of retrorse slender tapering apical processes that are 

 gradually divergent from shaft in ventral aspect; anal tube with pro- 

 nounced ventral process at approximately midlength and a pair of 

 basal processes, each of which is curved anteriorly and acute at apex. 

 Female unknown. Ground color of anterior dorsum dull green, with 

 poorly delimited black area surrounding yellow markings at apex of 

 crown, a pair of larger yellow spots between apex and ocelli, an area 

 before each ocellus and bordering suture, a few areas on pronotum 



