18 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



6 



rounding cone, outermost a free plate, disks 4 in number and not 

 joint-like; maxilla with palpifer and 4-jointed palpus; third joint 

 from apex with fleshy process on inner side, lacinia broad and flat- 

 tened, with 12 setae on apical margin and no break or gap in this 

 armature (fig. 6) ; labium Avith palpiger and 2-jointed palpus. 

 Thorax : The tergum, composed of areas A, B, C, and D ; A, except- 

 ing in prothorax, and B and C sparsely haired, A prothorax bare 

 and constricted, D bare and narrow ; mesothorax and metathorax 

 with enlarged alar area (A and B terminating in alar region with 

 acute angles) which is sparsely haired and rather well separated 

 from preepipleurite ; prothorax with the alar area absent ; pleurum ; 

 preepipleurite rather large and sparsely haired; postepipleurite 



rather large and bare ; prehypopleu- 

 rite large, triangular, heavily chi- 

 tinized and sparsely haired and post- 

 hypopleurite large and sparseW 

 haired; legs with 4 joints and an 

 apical claw, joint 3 with a small, 

 soft pad on inner side at apex. Ab- 

 domen : The tergum of urites 1-9. 

 inclusive, is composed of areas A. 

 V>, C. and D (C somewhat inclined 

 to subdivide C^'% with C^ haired, 

 on. urites 2-7) ; B and C are sparsely 

 haired. A bare and D bare and nar- 

 row: urite 10 consists of an epi- 

 jnoct, which is sparsely haired and 

 has pseudocerci at the caudad lat- 

 terad extremities; urites 1-8, inclu- 

 siw. with spiracular area contain- 

 ing spiracle, but urites 9 and 10 have the spiracle wanting and 

 the spiracular area is not demarked; urites 1-7, inclusive, have 

 the alar area large, distinct, bilobed, and sparsely haired, urites 8 

 and 9 with the alar area smaller, sparsely haired and not distinctly 

 bilobed, and urite 10 with the alar area wanting; pleurum; urites 

 1-8 preepipleurite distinct and separate from postepipleurite, both 

 sparsely haired, urite 9 with preepipleurite and postepipleurite not 

 separated, but forming an epipleurite which is sparsely haired, and 

 urite 10 with epipleurite not recognizable; urites 2-7 with hypo- 

 pleurite distinct and not divided into prehypopleurite and posthypo- 

 pleurite; urites 1, 8, 9, and 10 with hypopleurite indistinct or want- 

 ing; urites 2-7, inclusive, with well-develoj)ed uropods; urites 1, 8, 

 and 9 uropods wanting and urite 10 with postpedes and with a rather 

 prominent postcallus which is thickly haired. 



-PTERONIDEA WINNANAE UOH- 



WEE. Maxilla. 



