430 PROCEEDINGS OF THE NATIONAL MUSEUM vol.86 



Type. — U.S.X.M. no. 20407, including serial sections of post- 

 pharyngeal region. Paratype, U.S.N.M. no. 20408, including serial 

 sections of i^ostpharyngeal region. 



Remarks. — GeopJana montana is seen to be an inhabitant of moun- 

 tain regions in Costa Rica. Its collection in three different locali- 

 ties, at different times and by different collectors, indicates that the 

 species must be relatively common. It is closely related and very 

 similar in sexual anatomy to Geoplana cameliae Fuhrmann, 1914a, 

 found at 1,400-1,800 meters in the central Cordilleras of Colombia. 

 It differs from this species in color pattern, eye distribution, greater 

 muscularity of the penis papilla, and much better development of 

 the glandular duct. It is a question whether G. montana should 

 not be regarded as a geographical variety of G. cameliae, but on 

 present knowledge it seems best to make a separate species of it. 

 One is forced to place considerable weight on differences in color 

 pattern, because of the many similarities in general structure and 

 sexual anatomy between the numerous species of Geoplana. 



Family BIPALIIDAE 



Genus BIPALIUM Stimpson, 1857 



BIPALIUM COSTARICENSIS, new spericj. 



FiQURBs 49, e; 50, a 



Material examined. — Two specimens, both asexual. 



Description. — Type, over 100 mm long (much coiling of the body 

 made it impossible to get the exact lengtli) ; paratype, about 80 nmi 

 long; width anteriorly, 3 mm. One of the long, slender species of 

 Bipalium. Head 4 mm wide, typical of the genus. Arrangement of 

 the eyes on the head shown in figure 50, «, dorsal surface to the right, 

 ventral to the left. Behind the head, the body first widens slightly, 

 remains of this width for about tlie anterior third of the body, then 

 gradually diminishes to the rounded posterior end. 



Color. — There is a very narrow middorsal black line that gradually 

 disappears posteriorly; to either side of this the drab background 

 gradually takes on a dark-brown color, which increases to the lateral 

 margins. Posteriorly also the dark-brown color gradually intensifies 

 until the posterior fourth of the body is a dark brownish black, slightly 

 lighter toward the median region. Color descriptions based on alco- 

 holic specimens several years old are, of course, not very reliable, but 

 both specimens give the same impression as to color shades and pattern, 

 although one is much more faded than the other. The latter, selected 

 as the type, appears not to have suffered much loss of color. Ventral 

 surface drab, with the midventral creeping ridge typical of the genus. 



