424 



BULLETIN T>4, UNITED STATES NATIONAL MUSEUM. 



sides of the head, halfway between the anterior and the posterior 

 margins. The lateral margin of the head near the base is produced in 

 a small lobe on either side. The first pair of antenna? have the basal 



FIG. 477. ASELLUS BREVICAUIM (AFTER FORBES), a, HAND OK MALE. X 27. b, ONE OF FIRST PAIR 

 OF GENITAL PLATES OF MALE. X 51. c, ONE OF SECOND PAIR OF GENITAL PLATES OF MALE. X 25. 



article short and broad; the second article is a little longer than the 

 first and more slender; the third article is about half as long as the 

 second. The flagellutn is composed of twelve articles. The first 



antenna? extend to the middle of the fifth 

 article of the peduncle of the second pair 

 of antennas. The first three articles of the 

 second antenna? are short and subequal ; the 

 fourth article is as long as the first three 

 together; the fifth is one and a half times 

 longer than the fourth. The flagellum is 

 composed of about seventy-five articles and 

 extends to the posterior margin of the fifth 

 thoracic segment and is 6 mm. long. The 

 maxillipeds have a palp of five articles. 

 The palp of the mandibles is composed of 

 three articles. 



The segments of the thorax are subequal, 

 each being about 1 mm. in length. The 

 lateral margins of all the segments are 

 straight and entire. 



Epimera are present on the first segment 

 only and are placed at the antero-lateral 

 angles. 



The first two segments of the abdomen are short and visible only in 

 the middle of the dorsal surface, being covered at the sides by the 

 seventh thoracic segment. The terminal segment is 4 mm. wide and 

 3 mm. long. The post-lateral angles are rounded and the posterior 

 margin produced in a broadly rounded lobe between the uropoda. 

 The uropoda are 2 mm. long. The peduncle is 1 mm. long and 1 



FIG. 478. ASELLUS BREVIC-AVDA. 

 xo. 



