202 . Psyche [December 



a serrated blade directed posteriorly; below the apical hooks is a 

 pair of large hooks, curved forward. 



The food of the larva appears to consist largely of unicellular 

 organisms taken into the mouth without any apparent selection. 

 Microscopic examination of the contents of the alimentary canal 

 showed a quantity of such brown organisms and a smaller number 

 of some sort of an alga. Three Copepods were found in the pro- 

 ventriculus of one specimen. 



The pupa does not differ from americana except in color, the 

 abdomen being quite colorless while the dorsum of the head and 

 thorax is yellowish brown and the lateral and ventral surfaces 

 dull white. 



The transformation from the pupa to the imago took place in 

 the aquarium after approximately sixty hours, the adult issuing 

 through an irregular aperture in the dorsum of the thorax. 



The following description of the male is taken from freshly 

 emerged specimens: 



Corethra albipes Johannsen. (male) 



Basal joint of antemise pale red, succeeding joints pale yellow with black bases; 

 antennal hairs light yellow, upper surface of proboscis and palpi fuscous; incisures 

 of palpal joints not lighter; cheeks yellowish white; ocellar space brown. Ventral 

 surface of proboscis fuscous. Thorax pale brown dorsally with three reddish 

 brown longitudinal stripes, the median stripe with a piceous median line and 

 piceous lateral borders, the lateral stripes with piceous lateral borders only; the 

 median stripe is produced anteriorly and abbreviated posteriorly, the lateral 

 stripes are abbreviated anteriorly and produced posteriorly; plurse dull white with 

 a pale brown suffusion, spotted with piceous; scutellum pale brown with a black 

 median line and an irregular black spot on each lateral angle; mctathorax pale 

 brown, peppered with darker spots. Ventral surface of thorax yellowish white. 

 First and last abdominal segments smallest, others nearly equal; ground color of 

 dorsal surface pale yellow marked with piceous, the markings being heaviest on 

 the anterior part of the segments; sometimes a more or less well-defined anterior 

 median spot and a darker anterior lateral spot on each segment. Hypopygium 

 consisting of two jointed hooks, dark brown in color and about as long as the last 

 abdominal segment. Ventral surface of abdomen with an irregular black spot on 

 either side of the median line. Legs pale yellow, the last three tarsal joints dark- 

 ened. Wings pale yellow, the veins clothed with long yellow hair; hair is also 

 present on the wing margins, reaching its greatest development on the posterior 

 margin; hair on posterior margin in two rows, one about half the length of the 

 other; longest row composed of very wide hairs (see fig. 2 ; 1). Halteres white. 

 Length of two specimens 7 mm. and 6.5 mm. 



