202 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



vol. 43. 



EXCIROLANA CHILENSIS, new species. 



Body oblong-ovate and very convex. Color, in alcohol, yellow, 

 marked with scattered arborescent biack markings. 



Head large, wider than long, with the front excavate between the 

 antero -lateral angles and the median process for the reception of the 

 basal articles of the first antennae. Antero-iateral angles obliquely 

 truncate. The anterior margin is produced in the middle in a long, 

 narrow process between the basal articles of the first antennas and 

 becomes dilated at its extremity, which is continuous with the frontal 

 lamina. The eyes are large and subquadrate and extend half the 

 length of the lateral margin. The peduncle of the first antennas is com- 

 posed of three articles, the first two of which are subequal and dilated, 



being about as wide as long; the third 

 article is shorter and narrower than 

 either of the other two; the flagellum is 

 composed of 15 articles and extends to 

 the posterior margin of the third thoracic 

 segment. The second antennas have a 

 peduncle composed of 5 articles, the first 

 two of which are directed forward, the 

 basal one being concealed in a dorsal 

 view by the first antennas; the first 4 

 articles are short, the fifth being much 

 longer than any of the others; the fla- 

 gellum is broken off at the ninth joint. 



The segments of the thorax are sub- 

 equal. All, with the exception of the 

 first, are provided with wide, subquad- 

 rate epimera. The greatest width of the 

 thorax is 4 mm. 



The first 5 segments of the abdomen 

 are short and subequal, all visible in 

 a dorsal view, the fifth being free at the sides, which are not 

 covered by the fourth segment. The sixth or terminal segment is 

 wider than long, 2\ mm.: \\ mm., and is triangularly produced at 

 its posterior extremity. The length of the entire abdomen is 4 mm. 

 The peduncle of the uropoda is produced at its inner extremity; 

 the inner branch is wide and has the posterior extremity obliquely 

 truncate; the outer branch is about half as wide as the inner branch 

 and also has the posterior extremity obliquely truncate, but less so 

 than the inner branch. The posterior margin of the terminal abdom- 

 inal segment as well as the posterior margin of the uropoda is fringed 

 with long plumose hairs. 



The first three pairs of legs are prehensile, the last four pairs ambu- 

 latory; all are furnished with spinules. 



Fig 1.— EXCIROLANA CHILENSIS X6. 



