( cxli ) 



The Drepanulidae retain a primitive character in maintaining 

 the tergite and sternite sections of the cingula, and in those 

 genera where the cingula is more or less complete, i. e. ad- 

 vanced in type, the saccus retains its frontal development, a 

 primitive character ; another like character is the retention of 

 the chitinous anus, which in all the higher families has become 

 a fine membranous organ, in most cases so soluble as to dis- 

 appear entirely in many mounts that are finely prepared. 

 Most of these points appear in the two figures that I show. 



Drepana harpagula, Esp., 



has the tegumen well advanced, the dorsum is hollowed and 

 broadish, well excised so as to form two long fine lobes shortly 

 haired, below are two long strong arms with a slightly bulbous 

 termination, copiously if shortly haired; the lateral curtains 

 are finely shagreened ; the tergite part of the cingula is a fine 

 broad hood fused into and within the tegumen and its laterals ; 

 the sternite section of the cingula, with the saccus in its higher 

 form, i. e. receding development, forms a narrow curved 

 process articulated to the tergite portion ; the harpagones are 

 composed of a pair of small elliptical basal appendages, and 

 rising above them are two large ovate clasps covered with long 

 strong hairs ; the aedoeagus is simple, a plain waved tube 

 with a strongly shagreened vesica, 



D. falcataria, L., 



has the tegumen of entirely the same type but very much 

 more ample and larger ; the cingula is very narrow in the 

 sternite, but fused into the broad tergite hood; the saccus 

 is produced well forwards, whilst the clasps are small, almost 

 wedge-shaped, directed upwards and strongly spined at the 

 upper apical angle ; the sedoeagus is shortish and broad with 

 the vesica very strongly dentate ; the anus has maintained its 

 position in spite of the fact that the preparation from which 

 the figure is taken underwent an exceptional amount of 

 reducing and clearing. 



The Lithosiinae and Arctiinae show in some of the genera 

 decidedly complicated structures, thus showing their early 

 derivation, but generally speaking they have advanced a 

 good deal and have in many cases very simple organs. In 



