34 PROC. ENT. SOC. WASH., VOL. 20, NO. 2, FEB., 1918 



MD, mandible. Prg, palpiger. 



MX, maxilla. SM, Submentum. 



Mxb, Blades of Maxillulae. SP, Spinneret. 



MxL, Maxillulae. St, Stipes maxillaris. 



MxLb, Maxillary lobe. Stl, Stipes labialis. 

 OB, Bridge connecting dorsal hind TR, Tentorial bridge. 



margins of epicranium. VaT, Ventral arm of tentorium. 



P-I, P-II, P-III, Joints 1, 2, 3, of 



maxillary palpus. 



PLATE 1. HEAD PARTS OP THE OPOSTEGIDAE. 



Fig. 1, labrum and anterior dorsal region of head capsule (Opostega sp. 

 from Hawaii) ; fig. 2, maxillae, hypopharynx and maxillulae (do) ; fig. 3, 

 antenna (do) ; fig. 4, labium, maxillae, and anterior ventral region of head 

 capsule (do) ; fig. 5, antenna (Opostega nonstrigella Chambers) ; fig. 6, 

 labium and maxilla (0. nonstrigella Chamb.) ; fig. 7, mandible (Opostega 

 sp. from Hawaii); fig. 8, dorsal view of head (do); fig. 9, ventral view of 

 head capsule (do). 



PLATE 2. HEAD PARTS OF THE NEPTICULIDAE. 



Fig. 10, antenna (Ectooedemia phleophaga Busck) ; fig. 11, mandible (do) ; 

 fig. 12, labium, maxillae, and anterior ventral region of'head capsule (do); 

 fig. 13, half of head capsule, ventral view (Nepticula nyssaefoliella Cham- 

 bers) ; fig. 14, labrum (E. phleophaga Busck) ; fig. 15, epipharynx (do) ; 

 fig. 16, dorsal view of head (do); fig. 17, ventral view of head capsule (do). 



PLATE 3. HEAD PARTS OF THE TISCHERIIDAE (TISCHERIA QUERCIVO- 



RELLA CHAMBERS) . 



Fig. 18, antenna; fig. 19, mandible; fig. 20, maxillae, hypopharynx and 

 maxillulae; fig. 21, labrum; fig. 22, epipharynx; fig. 23, labium, maxillae, 

 and anterior ventral region of head capsule; fig. 24, dorsal view of head; 

 fig. 25, ventral view of head capsule. 



PLATE 4. HEAD PARTS OF THE LEUCOBTERYGJDAE. 

 Fig. 26, labrum (Proleucoptera albella Chambers) ; fig. 27, epipharynx 

 (do) ; fig. 28, maxilla, hypopharynx and maxillulae (Proleucoptera smila- 

 ciella Busck); fig. 29, hypopharynx and maxillulae (P. albella Chamb.); 

 fig. 30, antenna (do) ; fig. 31, mandible (do) ; fig. 32, labium, maxillae, and 

 anterior ventral region of head capsule (do) ; fig. 33, dorsal view of head 

 (do); fig. 34, ventral view of head capsule (do). 



