118 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



Body narrow, elongate, a little more than four times longer than 

 broad, tt mm.: IT mm., almost cylindrical. 



Head wider than long, 2 mm.: 3 mm., with the frontal margin 

 slightly excavate on either side of a small median point. Kyes small, 

 round, composite, and situated in the antero-lateral angles of the head. 

 The first pair of antenme have the basal article short, but somewhat 

 dilated; the second article is not quite as long as the lirst; the third is 

 twice as long as the second. The flagellum is composed of ten articles. 

 The first antennae extend almost to the middle of the fifth article of 

 the peduncle of the second antennaj. The second pair of antenna? have 

 the first two articles short, the second a little shorter than the first; 

 the third article is equal in length to the first two taken together; the 

 fourth is a little longer than the third; the fifth is a little longer than 

 the fourth. The flagellum is composed of thirteen articles. The 

 second antenna? extend to the middle of the first thoracic segment. 

 The maxilliped is composed of seven articles. The mandible has a 



Fig. 101.— CoNILERA CYLINDRACEA. «, MAXILLIPED. X 27^. 6, FRONTAL LAMINA. X Slf. C, SECOND 



MAXILLA. ;■; 27J. d, MANDIBLE. X 27j. e, First maxilla. X 27}. 



palp of three articles. The frontal lamina is conspicuous on the ventral 

 side; the anterior end is rounded; the posterior end is produced in a 

 narrow process. 



The first segment of the thorax is twice as long as the second; the 

 second and third are equal in length; the fourth, fifth, and sixth seg- 

 ments are equal and each is one and a half times longer than the third; 

 the last segment is equal to the third. The epimera are distinct on 

 all the segments, with the exception of the first. They are narrow, 

 elongate plates, equal in width, with the posterior angles not produced 

 beyond the posterior margins of the segments. In the epimera of the 

 first four segments the posterior extremity is rounded; in the last two 

 the outei' post-lateral angle is not rounded, but angular. A carina 

 crosses all the segments obliquely. 



The first segment of the abddmen is entirely concealed b}^ the seventh 

 thoracic segment except at the sides. The terminal segment is trian- 

 gular, with the apex very acute. The posterior margin at the apex and 



