484 



BULLETIN 54, UNITED ST^^TES NATIONAL MUSEUM. 



On either side of the head the lateral margin is produced in a large 

 spine. Numerous small spines also beset the dorsal surface of the 

 head. The tirst pair of antennae have the first two articles about 

 equal in length, the second a little more slender than the first; the 

 third article is twice as long as the second. The flagellum is composed 

 of twenty -three articles and extends about two-thirds the length of 

 the fourth article of the peduncle of the second pair of antennae. 

 The first three articles of the peduncle of the second pair of antennse 

 are short and beset with numerous spines; the fourth article is very 



Fig. 541.— Munna cxca. x G. 



long; the fifth is equal m length to the fourth. The flagellum is 

 composed of about twenty-seven articles. 



The first four segments of the thoi'ax are the largest. The thorax 

 is l)roadest about the third and fourth segments. The following three 

 segments })econie gradually much narrower and .shorter. The first 

 segment is beset with numerous long, slender spines. There is a long, 

 conspicuous spine on either side of the lateral margin of each segment, 

 and numerous spines, both long and short, with stiff hairs on the dorsal 



