62 Lloyd's natural history. 



but, till latterly, his determination has been entirely over- 

 looked. The typical silkworms, belonging to the genera 

 Bo/ubyx (Linnseus) and Theophila (Moore), are all East 

 Indian, and several allied genera are found in Tropical 

 America ; but only a few African genera have been referred 

 to the BoDibycidce^ and our only European representative is 

 Endromis. The name Bomhycidce. has been erroneously 

 applied by several entomologists to the very dissimilar family 

 Lasiocainpidcc. 



GENUS TIIERINIA. 



Therijiia^ Hiibner, Verz. bek. Schmett., p. 290 (1822 ?). 

 Asthenia, Westwood, Jardine's Nat. Libr., Exot. Moths, p. 209 



(184.). 



Asthenidia, Westwood, Trans. Zool. Soc. Lond., x., p. 515 

 (.879). 



Body rather slender, and very short and weak, legs weak, 

 antennae strongly pectinated, wings very broad, moderately 

 lono;, white, with brown bands. Fore-winces with the cell very 

 short, that of the hind-wings open ; hind-wings tailed ; sub- 

 costal and median nervures both three-branched; only one 

 sub-median nervure. 



The position of this genus is somewhat uncertain. It is 

 allied to the Indian genera Urahfcroides (Moore), and 

 SiropJiodia (Hiibner), formerly classed with the GcoDietrcc, but 

 which Sir George Hampson has recently included in the 

 Urauiidce. (Cf. vol. iii., p. 43.) Both these genera, however, 

 as well as Uraptcryx (Leach), to which they have a superficial 

 resemblance, have closed hind-wing cells, and almost simple 

 antennix:. Except in the case of Uraptcryx^ which is, of 

 course, a true Geonietra, the transformations of all these 

 genera of which we have been speaking are quite unknown at 

 present. 



