104 INSECUTOR INSClTIit MENSTRUUS 



ous strongly mottled and irrorated with dark fuscous and blackish scales, 

 which form an ill-defined dark shade on basal half of dorsal edge, a large, 

 ill-defined dark area at costal third extending attenuated along costa 

 nearly to base, and a broad, dark fascia across the outer ends of the 

 lobes; this fascia is externally edged with white scales and the narrow 

 apical strip beyond is light ochreous with a dark brown sinuated line at 

 the base of the cilia ; small black scale tufts beyond the edge on the mid- 

 dle and at apical third of dorsum. Hindwings dark fuscous with ochreous 

 cilia ; third lobe with a large black scale tuft just before apex and a few 

 scattered projecting black scales along the entire dorsal edge. Abdomen 

 ochreous fuscous, each joint tipped with white posteriorly ; fourth joint 

 shaded with black. Legs fuscous, tarsal joints with broad white annula- 

 tions. 



Alar expanse, 1 1 mm. 



Habitat : Honolulu, Oahu, Hawedian Islands. 



Type, Cat. No. 18429, U. S. Nat. Mus. 



Mr. Swezey informs me that this species was introduced purposely from 

 America into Hawaii some 1 2 years ago by Mr. Koebele, along with 7 

 other species of Lantana insects, and it should thus undoubtedly be cred- 

 ited to the fauna of Central America, though I have no actual specimen 

 from there. 



Petrochroa, new genus (family Cygnodiidae). 



Type, P. swezeyi Busck. 



Labial palpi long, curved, nearly smooth ; both joints slightly thickened 

 and roughened in front ; terminal joint nearly as long as second, pointed. 

 Antennae three-fourths serrated ; basal joint with strong pecten. Face 

 2uid head smooth. Forewings smooth, elongate ovate, apex somewhat 

 produced, pointed ; 1 2 veins ; 7 and 8 out of 6 ; 7 to costa ; rest sepa- 

 rate ; 2, 3, 4, and 5 nearly equidistant; 1 b furcate at base. Hind- 

 wings more than half the width of the forewings, pointed; 6 and 7 

 stalked, enclosing apex ; rest of the veins separate ; 8 reaching to apical 

 fourth ; space between 7 £ind 8 large and upper cell vein weak ; internal 

 vein to base of 6 + 7 strong ; in the males the venation in both wings 

 may often be distorted ; in the forewing vein 7 may be nearly or quite 

 obsolete ; in the hindwings large male sense tufts dislocate the veins ; 

 female frenulum consisting of three spines. Posterior tibia hairy above. 



