306 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



minating- process at the upper end, half the width of the article and 

 extending- to the extremity of the second article; the second article is 

 half as long- as the first article (not including this process); the third 

 article is half as wide as the second, which is 

 equal in width to the first, and is about one-half 

 as long as the second, and hardly to be distin- 

 guished from the articles of the fiagelluuL The 

 tiagellum is composed of about ten articles, and 

 extends to the posterior maro-in of the first tho- 

 racic segment. The second pair of antenna? have 

 the first article very short; the second and third 

 are subequal and each is about twice as long* as 

 tiie first; the fourth and fifth are subequal and 

 each is a little long-er than the third. The fla- 

 gellum is composed of fourteen articles and 

 extends to the posterior margin of the second 

 thoracic segment. 



The first segment of the thorax is about twice 

 as long as iinj of the following seg-ments. which are subequal. The 

 lateral margins of the body are straight. The epimera are separated 

 on all but the first segment ])v faint lines. 



Fig. 330.— Paradynamene 

 ben,t.\mensis. abdomen 

 and last thoracic seg- 

 ment of male. < 4. 



Fig. 331.— Pakadyname.ne 1!i;n.ia.mi:n.sis. «, First antenna. i: 



rf, First maxilla, x 27^ r, Maxilliped. 



b, r. Mandibles. 



The abdomen is composed of two segments. The first segment is 

 two and a half times longer than the last thoracic segment, and has 

 three suture lines on either side indicating- partly coalesced segments. 

 It is produced backward in a small point on either side. The second 



