230 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



rather long and rather stout; those of the seventh pair are rather short 

 and slender. 



The abdomen is covered at the base, is more than one and a half 

 times longer than wide (8:5), and is much shorter than the thorax with 

 the head (i:3). The first five segments gradually increase a little in 

 length. The sides of the first five segments are a little roundly dilated, 

 excavate, or emarginate; the first and second segments are obliquely 

 truncated; the third, fourth, and fifth segments are gradually more 

 deeply and more angularly emarginate. 



The terminal segment of the abdomen is cordate, impressed at the 

 base, obscurel} 7 carinated, much wider than long (6:5), manifestly 

 longer than the other segments of the abdomen taken together (10:9). 

 The uropoda are manifestly longer than the terminal abdominal seg- 

 ment (9:8); the inner branch is very much shorter and scarcely wider 

 than the exterior branch, becoming narrower back of the middle, sub- 

 laminar, scarcely surpassing the apex of the last segment; the exterior 

 branch is narrow, sickle-shaped. 



Length 21.5 mm. 



Color from graj 7 to green, yellow on the terminal abdominal seg- 

 ment and the uropoda. a 



36. Genus OLENCIRA Leach. 



Bod} 7 relaxed, rather stout, more or less distorted. 



Head constricted at the base. First pair of antennae separated at 

 the base, rather compressed. Second pair of antenna? compressed. 

 Eyes manifest. 



Anterior margin of the first thoracic segment manif estty trisinuated. 

 The posterior angles of the first six segments of the thorax not pro- 



The above description is adapted from the following one of Schioedte and 

 Meinert's: 



Elliptica, bis vel ter longior quam latior (9:4). 



Caput mediocre, subtriangulum, quam annulus quartus trunci ter angustius, multo 

 latius quam longius, levissime immersum, fronte in orbem rotundata. Oculi parvi, 

 subovalis, tumidi, plus quam dimidia parte latitudinis capitis distantes. Antennae 

 primi paris subrectse, compressiusculae; angulum priorem annuli primi trunci articu- 

 lis binis ultimis superantes, articulum sextum antennarum secundi paris explentes; 

 8-articulate. 



Antennae secundi paris compressiusculae, quam antennae primi paris paulo angus- 

 tiores, angulum posticuru annuli primi trunci non attingentes; 9-articulatee. 



Margo anticus annuli primi trunci manifesto trisinuatus, sinubus lateralibus quam 

 sinu medio vix profundioribus. 



Anguli postici annulorum sex priorum trunci vix vel non prominuli, rotundati vel 

 obtusi; annuli septimi paulum prominuli, rotundati. Anguli annuli septimi angulum 

 posticum annuli primi caudalis spatio parvo non attingentes. 



Epimera subpendula; terna priora latiuscula vel angustiuscula, per paria sensim 

 latitudine decrescentia, margine postico late rotundato; terna posteriora angusta, 

 latitudine subaequalia, margine postico breviter rotundato. Epimera paris primi et 

 secundi angulum annuli fere explentia; paris tertii angulum annuli spatio parvo non 



