THE IMAGO. 7 



either (1) filiform, (2) fusiform, or (3) dilate, and are rarely simple, 

 but usually (I) ciliated, (2) with paired bristles at each joint,' 

 (3) with both cilia and bristles, (4) fasciculate, (5) dentate^ 

 (6) lamellate, (7) serrate, or (8) pectinate with single or paired 

 branches, rarely with two pairs of branches to each joint; they 

 may also be pubescent all over, or have long scales on the upper- 

 side, or be furnished with special secondary sexual characters, such 

 as notches, thickenings, sinuations, or tufts of scales. 





Fig. 2.— Autennae of Moths. (From Moths of India, vol. i.) 



The thorax consists of three segments — the prothorax, bearing the 

 teguloe or collar-lappets, the patagia or shoulder-lappets, and the 

 fore legs ; the mesothorax, bearing the mid legs and fore wings ; 

 and the metathorax, the hind legs and hind wings. 



The abdomen consists of nine segments, the terminal segments 

 being often much modified and little recognizable ; at its base are a 

 lateral pair of large tracheal stigmata, those on the other segments 

 being small, and at its extremity the anal tuft covering the orifice 

 within which are concealed the genital organs, consisting in the 

 male of paired lateral claspcrs and a medial curved upper process — 

 the uncus ; these vary extremely in form in closely allied species, 

 with the object probably of preventing hybridization ; they are often 

 useful, and generally reliable as a point of distinction between 

 closely allied species, but have been insufficiently studied in most 

 groups of Lepidoptera ; they are often accompanied by a scent- 

 producing genital tuft. 



^The legs consist of (1) coxa, (2) trochanter, (3) femur, (4) tibia, 

 (5) the 5-jointed tarsus bearing the ungues and pulvillus. The 

 fore tibia} have a medial spine-like process, which in many Psychidoi 

 is long and arises from the femoro-tibial joint ; the mid tibiae are 



