266 U.S. NATIONAL MUSEUM BULLETIN 261 



conspicuous, with a median angular excision. Color fuscous tinged with 

 dark green; face of male entirely yellow, of female yellow with a broad 

 black margin above. 



Holotype male. Upper New River, [British Guiana], c. 750 ft., 

 Feb. 19-22, 1938 (C. A. Hudson), and one female from New River 

 (BM). 



This species is related to A. obscurior (Fowler) but differs chiefly 

 in the location of the aedeagal processes, which are located near the 

 midlength of the shaft in A. izzardi. 



Acrogonia balloui, new species 

 Figure 253 



Length of male 9.5 mm.; of female 11.5 mm. Head with median 

 length about equal to transocular width in male, greater than trans- 

 ocular width in female, without an M -shaped elevation bordering 

 posterior margin, disc of crown strongly concave, antennal ledges in 

 lateral aspect carinate dorsally, clypeus flattened to slightly concave, 

 face not pubescent. Pronotum not punctate, with diagonal rectilinear 

 dorsopleural carinae. Forewing coriaceous, with apical membrane 

 including all of apical cells, surface not punctate, without super- 

 numerary veins in clavus. Male pygofer strongly produced, posterior 

 margin slightly concave dorsally; male plates abruptly narrowed in 

 basal third, thence gradually tapered to apices, not fused at their 

 bases; styles not extending as far posteriorly as connective, truncate 

 at apex; conective Y-shaped, with arms strongly divergent; aedeagus 

 bifid at apex, with a short ventral protuberance near base; anal tube 

 with a small ventral process in apical half. Ground color of crown dull 

 brown, with a Y-shaped marking at apex and a pair of spots, one 

 before each ocellus, black; pronotum with basal margin broadly con- 

 colorous with crown, disc sordid green, scutellum concolorous with 

 crown, with a black line subtending each basal angle; forewing with 

 coriaceous part dull green; face with a median longitudinal black 

 marking extending from apex of clypellus dorsally nearly to apex of 

 crown, antennal ledges and a line extending anteriorly from them, 

 not reaching apex of head, black. In two teneral specimens at hand 

 the deep green of the dorsum is replaced by a coppery hue. 



Holotype male, Caracas, Venezuela, Oct. 8, 1938 (C. H. Ballou), 

 collected on Allamanda cathartica Linnaeus, and a pair of teneral speci- 

 mens, same data (USNM) ; one male and two females, Trinidad Island, 

 July, on Croton sp. (NCS). 



This species is named in honor of the collector whose collections in 

 the tropics of the New World have contributed much to the knowledge 



