60 Journal New York Entomological Society. [Vol. xxiii. 



very minute spines. The lateral fringe of black hair begins near the 

 posterior magin of the second segment and extends to the posterior 

 margin of the eighth segment. The arrangement of gills is diagram- 

 atically shown in Fig. 4. A slight variation of gills occurs on the 

 caudal segments of differerent individuals. 



Pupa. — Length 30 mm., breadth 6 mm. The labrum is longer than 

 broad, extending shelf-like over the mandibles and bearing a group 

 of five long, dark colored, hooked setae on each lobe and two similar 

 setse, but not hooked, on each side near its base, a shorter seta of 

 lighter color points forward from the cephalic margin of each lobe 

 and a similar seta occurs laterad from each pair of long basal setae; 

 the mandibles are straight, without teeth and sharply pointed, reaching 

 not quite to the extreme of the labrum, each bears two setae near its 

 base; the dorsal part of the first abdominal segment is marked with 

 small cross folds, which give it a striate appearance, and is bordered 

 behind with wing-shaped marks, somewhat striate and bearing numer- 

 ous small thorns on their caudal margin, the lateral fringe is black, 

 commencing near the caudal margin of the fifth abdominal segment 

 and forming a loop beneath the caudal margin of the eighth segment. 

 The antennae reach to the caudal margin of the sixth segment. The 

 spines on the chitinous plates are serially shown in Fig. 5, but their 

 number and arrangement is subject to variation indifferent individuals. 



Explanation of Plate VI. 



Larval case of Astenophyla.v argus. 



Wings of male. 



Larva, head and part of thorax, dorsum. 



Diagram of gill arrangement on left side of abdomen. 



Pupa, chitinous abdominal plates. 



Male genitalia, laterial view. 



Larva, labrum. 



Larva, frons. 



Larva, maxilla and labrum, in part, ventral. 



