414 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



Plate 57. 



Fig. 1. Bittium (Semibittium) nicholsi; type; 6.1 mm.; p. 399. 



2. Bittium (Semibittium) nitens; type; 5.7 mm.; p. 400. 



3. Bittium (Stylidium) eschrichtii icelum; type; 15 mm.; p. 388. 



4. Bittium (Semibittium) larum; type; 10 mm.; p. 407. 



5. Bittiuvi (Semibittium) subplanatum; type; 10.9 mm.; p. 395. 



Plate 58. 



Fig. 1. Bittium (subgenus?) mexicanum; type; 6.1 mm.; p. 412. 



2. Bittium (Semibittium) quadrifilatum; type; 7 mm.; p. 398. 



3. Bittium (Semibittium) quadrifilatum; 11.5 mm.; p. 398. 



4. Bittium (Stylidium) eschrichtii; 14 mm.; p. 387. 



5. Bittium (Stylidium) eschrichtii montereyense; type; 13.8 mm.; p. 389. 



