JANUARY, 1902, PLACE MODES OF ACRIS GRYLLUS FOR MADISON, WIS. 
75 
Place-Modes of Acris Gryllus for Madison, Wis. 
By P. H. DERNEHL. 
The purpose of this paper is to describe the Madison form unit 
of the cricket frog Acris gryllus var. crepitans (Le Conte) for 
comparisons with specimens from other localities and with future 
determinations of this form unit. 
The frogs employed for study in the preparation of this paper 
were taken October i8, 1901, in Dane county, Wisconsin, along 
the banks of an artificial lagoon, fed by Lake Mendota, and near 
the Catfish river. 
Along the banks of this artificial stream the frogs were ex- 
tremely numerous, making it a comparatively small task to secure 
the one hundred specimens from which my tabulated results 
were obtained. 
The frogs were collected at random. 
DESCRIPTION OF THE FORM-UNIT. 
The eyes are comparatively large and prominent, their pos- 
terior angles being slightly anterior to the angles of the mouth. 
(See Fig. i.) The snout is extended, and projects beyond the 
lower lip. (See Fig. i.) From about its middle point the body 
tapers gradually towards the snout with no contraction for the 
neck. (See Plate.) The external nares are small and more 
anterior than the eye, and each is placed upon a slight eminence,, 
the canthus rostralis. The tongue is broadly oval, slightly or not 
at all notched (See Fig. IL) ; individuals having their tongue not 
notched predominating in numbers. It is free for about one- 
fourth or a little less of its length from behind, and is also free 
at the sides. 
The tympanum is very small, in some individuals barely notice- 
able. 
The inner nares arc decidedly larger than the external nares. 
The vomerine teeth are situated in two oval patches slightly 
larger than the internal nares, and are placed between these, their 
slightly longer axis inclined to each other posteriorly. Their poste- 
rior borders are in about the same transverse line with those of the 
inner nares, and they extend a little beyond anteriorly. (See 
Fig. II.) In this respect the frogs differed decidedly from the 
individuals described by Cope, who describes the position of these 
teeth thus : 'The vomerine teeth are situated in two oval patches 
about the size of the nares, the slightly longer axis inclined a little 
