THYSANURA. 



57 



FIG. 61. Camfodea 

 staphylinus. (After 

 Lubbock.) 



ing in that the body is not clothed with scales, the eyes are wanting, 



and the segments of the abdomen are of nearly 



equal width. But the caudal appendages are 



long, thread-like, and many-jointed. To each of 



the first seven abdominal segments there is at- 

 tached a pair of ventral appendages, the rudi- 

 mentary legs already mentioned. 



Two genera have been described. Campodea 



has two caudal appendages, and the palpi are 



minute. In Nicoletlna there are three caudal 



appendages, and the palpi are long. 



Family III. LEPISMID/E. In this family the 



body is clothed with scales ; the palpi are short ; 



and the abdomen tapers towards the caudal end. 



The eyes are large, compound, and contiguous in 



Mdchilis ; and small and far apart in Lepisma. 



The sub-abdominal appendages are well devel- 

 oped in Machilis ; in Le- 

 pisma they are confined to 

 two of the posterior segments, and represented 

 by groups of stiff hairs on the anterior ones. 

 The three described genera are distinguished 

 as follows : 



A. Prothorax much enlarged, and the abdomen ta- 

 pering rapidly, so that the* body is almost heart- 

 shaped ; caudal appendages short. LEPISMINA. 



A A. Body more elongated ; caudal appendages long. 

 B. Eyes large and contiguous. MACHILIS. 



BB. Eyes small and far apart. LEPISMA. 



The Fish-moth, Lepisma saccharina (Fig. 

 62), is a well-known pest in some parts of the 

 country. It is silvery white with a yellowish 

 tinge about the antennae and legs ; it measures 

 8 mm. (.31 in.) in length. It injures clothing, 

 especially starched clothes ; and the bindings 

 of books. An instance was reported to me where they caused 

 the paper to cleave from the walls of a house by feeding upon 

 the starch with which it was fastened in place. 



FIG. 62. Lepisma saccha" 

 rina. (After Lubbock.) 



