GASTROCOPTA. 199 



SUPPLEMENT TO VOLUMES XXIV-XXVII. 



Subfamily Gastrocoptesle. 

 GASTROCOPTA (Vol. XXIV, p. 6). 



Falsopupa Germain (see Vol. XXV, p. 370) is a synonym 

 of the typical group of Gastrocopta. 



A new key to the North and Middle American species of 

 the typical group of Gastrocopta is given below, as that in 

 Vol. XXIV, pp. 54-57, is defective, at least one species (which 

 was not then accessible to me) being wrongly placed; also, 

 there are errors in the lettering of some of the entries. 



Key to American Subgenera of Gastrocopta. 



r One or two teeth on the parietal wall are very small 

 j or minute (2). 

 ' i Teeth of the parietal wall are moderately to strongly 

 ^ developed (3). 



! Palatal folds present. Subgenus Vertigopsis, xxiv, 27. 

 No palatal folds or palatal callus. 

 Subgenus Privatula, xxiv, 52. 



f Palatal folds standing on a white callus ; aperture nearly 

 3- -j filled by the large teeth. Subgenus Albinvla, xxiv, 13. 

 ^Palatal folds not connected by a callus (4). 



' Angular and parietal lamella diverging forward, the 

 whole like a mirrored letter y. 



Subgenus Immersidens, xxiv, 38. 



\ Angular and parietal lamellae concrescent into a sinuous 

 or bilobed lamella, or with the outer end of the pari- 

 etal projecting very little or not at all from the an- 

 gular. Subgenus Gastrocopta, proper, xxiv, 53. 



Key to North and Middle American species and principal 

 subspecies of the subgenus Gastrocopta* proper. 



-< f Lip distinctly or heavily calloused within (2). 

 1 Lip thin, not calloused within (16). 



