362 EXPLANATION OP PLATES. 



FIGUKE PAGE 



10, 12. G. pilsbryana St. Oak Creek, Arizona. 79413 ... 34 



11. G. pilsbryana St. S. Catalina Mts., Ariz. 109656. . . 34 



PLATES 4, 5. Gastrocopta pentodon and varieties. 



Explanation of figures 1-41 on page 32; figs. 42-53, on 

 page 34. 



PLATE 6. Gastrocopta. 



I, 2, 8. G. coehisensis P. & F. Tanner canyon. Huaclmca 



Mts. 97442 44 



3. G. coehisensis P. & F. 109679 44 



4. G. coehisensis P. & F. Santa Rita Mts. 78693 44 



5. G. ashmuni St. Dragoon Mts., Ariz. 112381 41 



6. 7. G. ashmuni St. Dragoon Mts., Ariz. 112383 41 



8. G. coehisensis P. & F. Huachuca Mts., Ariz. 97442 . . 44 



9, 10. G. perversa St. Benson, Arizona. 112063 40 



II. G. perversa St. Dragoon Mts., Ariz. 112390 40 



PLATE 7. Gastrocopta. 



1-5. G. prototypus Pils. Cotypes. 82823 47 



6, 7. G. basidentata Pils. Type. 190017 U. S. N. M 48 



8-11. G. oligobasodon P. & F. Ash canyon, Chiricahua 



Mts. 97444 46 



PLATE 8. Gastrocopta. 



1-4. G. bilainellata St. & Clapp. E. of Quartzsite, Ari- 

 zona. 98268 51 



5-7, 9. G. dalliana St. Nogales, Arizona. 78689 49 



8. G. dalliana St. Dragoon Mts., Arizona. 112395 49 



10, 11. G. dalliana media Pils. Montezuma's Well. 82918. 50 



PLATE 9. Chaenaxis. 



1, 2. Chaenaxis tuba P. & F. Benson, Ariz. 112062 2 



3. Chaenaxis tuba P. & F. Tucson, Ariz. 112124 2 



4. 5. Chaenaxis t. brevicostata Pils. Tempe, Arizona. ... 4 



6. Cha-enaxis intuscostata Clapp. Tucson, Arizona 3 



7-Q. Chaeuaxis intuscostata Clapp. Cotypes. 99599 .... 3 



PLATE 10. Gastrocopta. 



1, 2. G. corticaria Say. Upper Red Hook, N. Y 52 



3, 4. G. corticaria Say. Philadelphia, Pa. 64524 52 



5. G. carnegiei St. Type. Coll. Sterki 35 



