( cxlii ) 



certain genera the tergite section has become a very simple 

 organ, whilst the sternite retains great complexity. The genus 

 Euprepia {coscinia) is a good example of this. Endrosa is a 

 genus exemplifying the other direction, for we find the tergite 

 organ retaining a somewhat definitely tubular form with a 

 large uncus-like termination on the dorsum of the tegumen, 

 whilst those of the sternite are simple ; in neither, however, 

 has the cingula made much progress in development. In 

 Ilema we find certain very archaic characters combined with 

 decided advance in other organs. The cingula is extra- 

 ordinarily loose and unattached and is quite unconnected with 

 the harpagones except at its point of union with the tergite ; 

 the sedceagus is generally large and has frequently complex 

 cornuti and vesica; the tegumen is fairly advanced, whilst 

 the harpagones are also more or less, generally more, in an 

 advanced state of development. 



Ilema griseola, Hb., 



shows the cingula in a very loose unattached condition; 

 the sternite section consists of two long thin curved arms 

 attached to a fine membranous ventral plate, which when at 

 rest no doubt forms a cover to the lower part of the harpagones, 

 these arms are attached to the lateral plates of the tegumen, 

 and in higher groups form with them the complete cingula, 

 which is fused into the tegumen ; the uncal projection of that 

 organ is a longish, strong, curved process with a small terminal 

 tooth; the harpagones have a basal curved arm attached to 

 a broad, squarish, large sclerite whose front edge is irregularly 

 toothed, with a jagged beak-like process at its upper apex; 

 the large sedoeagus lies in a trough and has its vesica copiously 

 shagreened, together with a cluster of semiglobular cornuti. 



Ilema lurideola, Zinck., 



has the cingula much smaller but unattached, the lateral 

 plates of the tegumen smaller but the dorsal uncal develop- 

 ment much greater; the harpagones are simpler, large ovate 

 with a tail-like brush at the upper apex, whilst nearer the 

 base there is a small shoulder of spines marking, I believe, 

 the origin of the muscular attachment of the brushes. The 



