( cxxxix ) 



formidable spines) ; in achilleae tlie alieath is long and has a 

 similar double row of spines. 



In Heterusia the development of the tegumen is very small 

 and weak, but the whole of the sternite clasping and inter- 

 mittent organs are extraordinarily specialised, and are so com- 

 plicated that every part would require an explanation, so that 

 I have thought it advisable to figure it only. 



I have already in our Transactions referred to several 

 Palaearctic genera of the Psychidae, but it would be well to 

 confirm those observations, and I have therefore examined 

 various exotic species and genera. Two will probably suffice 

 for the present as they are confirmatory of others. 



Clania variegata, Snell. 



The organs are unusually long in this genus ; the tegumen 

 maintains its large hood-shaped cover, but it does not extend 

 down laterally quite so extensively as in some genera; the 

 harpagones are also largish, carrying strong teeth on the 

 apices ; the organ which I believe takes the place of the furca 

 (a name I gave to a bifurcate process arising from the base 

 of the harpagones some years ago, and which is almost uni- 

 versal as a guide and support to the sedceagus in the Ruralidae) 

 encircles the rear of the clasps (or harpagones), lapping over 

 them internally and extending in a long digitate process along 

 their upper margin, bearing a certain number of fine teeth on 

 ts upper edge. The sedoeagus is long and irregular, with a 

 swollen apex somewhat bifurcate. 



Pseudoclania dinawaensis, B.-B., 



has the tegumen decidedly shorter, though the saccus with 

 which it is connected by the cingula is equally as long; the 

 harpagones are of moderate size, broad at the base and then 

 suddenly tapering to the apex ; over the sedceagus and harpa- 

 gones is a peculiar pseudo-tegumen, which forms a hollowed 

 curtain of chitin rather deeply bifurcate in a downwards 

 curve; it lies immediately over the harpagones and well 

 below the tegumen, and certainly has nothing to do with 

 that organ, being a portion of the sternite; the aedceagus 

 is very long, irregular in shape, with a trumpet-shaped orifice, 



