308 bulletin: museum of comparative zoology. 



4. Nephridial tubercles broadly attached to the third band of the creeping 

 pad; dorsal lozenge-shaped markings rather indistinct 



P. ohausi Bouvier. 

 Nephridial tubercles free from the creeping pad; dorsal lozenge-shaped 

 markings very distinct .... P. ohausi subsp. guianensis Evans. 



3rd Section of P. juliformis. 



1. The larger primary papillae of the dorsal surface with a relatively reduced 

 base and enlarged, often spherically dilated, apex; 28-30 pairs of legs 



in the male and 29-32 pairs in the female 2 



The larger primary papillae much more strongly developed toward the 

 base than at the apex 6 



2. The smaller primary papillae very much reduced, often to a single one 

 between two large ones, and separated by broad interspaces occupied 

 by very small accessory papillae; crural papillae present on from 6 to 9 



praegenital pairs of legs in the male 3 



The smaller primary papillae well-developed and usually placed in series 

 of three between two large ones ; accessory papillae equally well-developed ; 

 crural papillae present on three or four praegenital pairs of legs in the 

 male 4 



3. Size large, female from 25-60 mm. in length; dorsal surface with more or 

 less distinct lozenge-shaped markings; accessory papillae numerous 



P. sedgwicki Bouvier. 

 Size small, unique female 15 mm. in length; color uniform and very dark; 

 accessory papillae less numerous . P. sedgwicki subsp. bavayi Bouvier. 



4. Larger primary papillae distinctly grouped in sinuous longitudinal series; 

 accessory papillae few and of small size P. juliformis swainsonae Ckll. 

 Larger primary papillae irregularly disposed, not forming longitudinal 

 series 5 



5. Larger primary papillae sharply preeminent over the smaller ones; acces- 



sory papillae very evident P. juliformis Guilding. 



Smaller primary papillae notably more developed; accessory papillae 

 becoming vestigial P. juliformis danicus Bouvier. 



6. Larger primary papillae with the apex poorly developed and of small 

 dimensions; smaller papillae much reduced and ordinarily disposed 

 singly between two large ones; accessory papillae very small; crural 

 tubercles on two or three praegenital legs in the male; prostates between 

 praeanal legs XII-XVIII; nephridial tubercles of legs IV-V broadly 

 attached to the creeping pads; 29 pairs of legs in the male, and 30-33 in 



the female P. broelemanni Bouvier. 



Larger primary papillae with a terminal cylinder of rather large size; 

 smaller ones well-developed and ordinarily disposed in threes between 

 two large ones, accessory papillae intergrading through all sizes to the 

 smaller primary papillae; crural tubercles present on two praegenital 



