THE PLUME-MOTHS OF CEYLON. 157 



case shown, and the second leg reaches the head. The maxilla and 

 first leg fall short, and expose a portion of the third leg, between 

 and beyond the second. The appendages project freely over the 

 fifth and sixth segments. 



" The anal armature consists of ten or twelve fine spines, little 

 more than hairs, curved and crossing one another in lyre shape, and 

 having a fine recurved flattened extremity. There is also a small 

 bristle above and below each (exposed) abdominal spiracle." 



Key to Genera of Sinhalese Orneodid^e. 



Hindwing with six segments . . . . Orneodes 



Hindwing with seven segments . . . . Triscsedecia 



ORNEODES, Latr. 



Antennae in male minutely ciliated. Labial palpi 3-jointed : 

 first joint very short, second joint much longer and usually straight, 

 third sometimes nearly as long as second, sometimes much 

 shorter. Maxillary palpi usually quite rudimentary, concealed 

 under the scaling (in pygmcea minute, acuminate ; in trachyptera 

 well developed). Haustellum moderate. Legs moderately long, 

 rather stout, closelv scaled ; fore-tibia in male usually with 

 (? androconial) tuft of scales; posterior tibial spurs moderately 

 developed. Abdomen short and thick set. Fore- and hind-wing 

 each cleft into six segments ; neuration completely developed . 

 but in forewing veins 5, 6, 9, 10 are often weakly developed or 

 absent ; no true discal cell in either wing. The sixth segment of 

 Kind wing usually provided in the male with a characteristic scent - 

 apparatus composed of an elongated deep fold or pocket, open above , 

 projecting below, in which lie long yellowish erectile sensory hairs, 

 very regularly striped longitudinally, rounded at the tip, arranged 

 distally ; in the female the fold is present, but without the scent- 

 scales. Cilia without the ramified hair-scales so characteristic of the 

 Pterophoridae. 



Artificial Key to Species of Orneodes. 



Expanse under 10 mm. . . . . 2 



Expanse 10 mm. or over . . . . 3 



Sixth segment h.w. much stouter than other 



segments . . . . . . miscroscopini 



Sixth segment h.w. not stouter than other 



segments . . . . . . pygmcea 



J Costa of f.w. with large patches of rough scales trachyptera 

 Costa of f.w. without such . . . . 4 



(General colour bright ochreous-orange . . thapsimt 



[General colour not bright ochreous-orange . . 5 

 _ /Expanse over 20 mm. . . . . niphostrota 



I Expanse under 20 mm. . . . . b' 



