( cxlvii ) 



wedge-sliaped and very hairy, whilst the upper edge is fur- 

 nished with a thick fringe of spines and hairs ; at the rear of 

 the upper edge are the two digital asymmetrical organs 

 previously alluded to, the one being much longer than the 

 other ; the sedceagus is an elliptical tapering tube of moderate 

 length, with a linear series of hooked teeth in its centre. 



The NotodontidaeTetSbin several very primitive characters ; the 

 cingula or girdle has advanced but little, in many genera there 

 is no cingula proper, the laterals having their origin at the 

 upper edge of the harpagones only, i. e. almost in the tergite ; 

 in others it arises lower down in the sternite, whilst in a few 

 the girdle is more or less complete but with its articulation in 

 the sternite and quite distinct. Again, the two sets of organs, 

 i. e. the sternite and tergite, are often prominent. These all 

 point to there being but little progress comparatively speaking 

 in these organs. 



Notodonta ziczac, L., 



is a very good general representative, even though in the 

 tegumen it shows decided development ; it is in this species 

 almost separated from the cingula, being a narrow dorsal hood 

 at the rear, with a considerable frontal extension well excised 

 at its back, the front edge being strengthened by an irregularly 

 and sharply toothed collar, which is also slightly dentate on 

 its mid-dorsal line ; in the hollow at the rear of this collar 

 lie a pair of sclerites rmited by an exceedingly fine membrane 

 and forming two lateral chitinous lobes, which are articulated 

 to the tegumen at their upper apices ; the cingula consists 

 merely of two broad lateral plates articulated to the rear of 

 the clasps on their upper edge, the fusion of these lateral 

 plates with the tegumen is but slight and at its extreme rear ; 

 the harpagones are oval, wider at the fore part, with a longish 

 horn issuing from the middle of the fore edge ; the sedceagus 

 is a straight tube having a highly curved apex, almost a broad 

 hook, with the vesica slightly armed with a few teeth. 



Lophopteryx camelina, L., 



shows its near relation to Notodonta both in its cingula, 

 which is somewhat similar, and also in the other organs ; the 

 tegumen has a front collar similar to Notodonta, but not 



