358 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



OBBA MESAI RICHI, new subspecies 



Plate 91, Figure 1 



The ground color of the early whorls is flesh-color, while that of 

 the later turns is buff. The interrupted bands of brown and mottlings 

 are chestnut-brown. The peristome is soiled white. The spiral 

 striations are quite obsolete on the upper surface of the last half of 

 the last turn, but quite strongly developed on the base. 



Type.— The type, U.S.N.M. No. 382698, has 4.9 whorls, and meas- 

 ures: Height, 13.2 mm; greater diameter, 29 mm; lesser diameter, 22 

 mm. 



In the collection of the United States National Museum are two 

 lots of two each of shells of a race of Obba mesai about whose definite 

 locality I am in doubt. One of these, U.S.N.M. No. 21043, two 

 specimens collected by the United States Exploring Expedition, bears 

 the label "P. I." The other, U.S.N.M. No. 103967, collected by 

 Rich, bears the label "Luzon, Philippines." One of these is now 

 reentered as U.S.N.M. No. 382698, the type. 



Remarks. — The exploring expedition sent out a party from Manila 

 to Laguna de Bay, where it divided, one part visiting the region about 

 Los Banos, including Mount Maquiling, the other pushing toward 

 Banahao, reaching at least Majayjaj 7- and Pagsanjan River. Rich, 

 Dana, and Brackenridge were in the Los Banos party. 



Since I have seen no specimens from Luzon that appear to belong 

 to the Obba mesai complex, I doubt if these were obtained here. 

 The general distribution of the species makes it much more likely that 

 these shells were obtained at the south end of Mindoro, which was 

 also visited by the expedition, and we assume that this was the case. 



The topotype, U.S.N.M. No. 103967, has 5 whorls, and measures: 

 Height, 13.8 mm; greater diameter, 28.2 mm; lesser diameter, 22.2 mm. 

 The adult specimen marked "Exploring Expedition collection, " 

 U.S.N.M. No. 21043, has 5 whorls, and measures: Height, 15.3 mm; 

 greater diameter, 30.2 mm; lesser diameter, 23 mm. 



The present subspecies has the strong crisscross sculpture of Obba 

 mesai sablayana on the upper surface of the last half of the last turn. 

 It is distinguished from it by practically lacking this element on the 

 basal surface. 



OBBA MESAI MESAI, new subspecies 



Plate 91, Figure 2 



The typical race when alive is of pale buff ground color on the early 

 turns, deepening on the later and base. In dead specimens the 

 ground color is flesh-color. The dark interrupted bands and mot- 

 tlings are dark chestnut-brown, the peristome being huffish flesh- 

 colored. The crisscross markings are very fine, almost obsolete, 



