The Life-History and Anatomy of Moths 



taic. The form and arrangement of the joints may be such as to 

 suggest the teeth of a saw; such antennae are said to be serrate. 

 When on the lower side of the joints of the antennae there are 

 minute plate-like projections, the antennae are described as lamel- 

 late. Many moths have pectinate antennae, the projections resem- 

 bling little combs, which may be arranged singly or in pairs on 

 each joint. Occasionally, but not often, there are two pairs 

 of such appendages on each joint. When the pectination is 

 excessive, so as to cause the antennae to resemble a feather, they 

 are said to be plumose. Figures 9 and 10 illustrate some of 

 these forms. In addition to the peculiarities which have just 

 been mentioned, antennas may be variously adorned with scales, 

 especially upon the upper side of the shaft, and they may be 

 notched, or provided with knot-like enlargements, in which case 

 they are said to be nodose, or they may be curved, or bent in 

 peculiar ways, when they are described as sinuate. 



The thorax, as in butterflies, consists of three segments, the 

 prothorax, the mesothorax, and the metathorax. The pro- 

 thorax bears the tegulae or collar-lappets, the patagia, or shoulder- 

 lappets, and the anterior pair of legs. The mesothorax carries 

 the second pair of legs and the fore wings. The metathorax the 

 last pair of legs and the hind wings. 



The abdomen, just as in butterflies, is normally composed of 

 nine segments, though the modifications of the terminal seg- 

 ments are often such as to make it difficult to recognize so many. 

 At the base of the thorax is situated a pair of large tracheal 

 spiracles, and on the other segments pairs of smaller spiracles. 

 Through these spiracles respiration is carried on. At the end of 

 the abdomen, more or less concealed by variously arranged tufts 

 of hair, are the organs of generation, which have in recent years 

 been studied quite closely by a few authors and are useful in 

 distinguishing species. 



The legs of moths are composed of coxa, trochanter, femur, 

 tibia, and tarsus, the latter composed of five joints, and armed 

 at its end with two more or less developed hooks, or claws, 

 known technically as the ungues, and also a pulvillus, or pad, just 

 back of the claws on the lower side. The legs are armed with 

 spines and spurs, and there are different sexual appendages in the 

 males of various genera. The cut (Figure 1 1) shows the structure 



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