EMBTOPTEKA OF THE NEW WORLD ROSS 421 



ters of Rhagadochir carpenteri Davis are certainly similar to those of 

 the American series placed by Davis in his genus Pararlmgadochir^ 

 but future studies may prove this similarity to be a result of converg- 

 ence. 



The number of hind basitarsal sole-bladders appears to be a constant 

 character within a species, genus, or even family throughout the order. 

 The genus Pararhagadochir is an exception to this rule, as the females 

 of the genus seem always to have two bladders, while males of the same 

 species may have only one. There is indeed a possibility that in males 

 of some species this character may be subject to intraspecific variation. 



KEY TO SPECIES OF PARARHAGADOCHIR (MALES) 



1. Inuer nodule of basal segment of left cercus conical ; right hemitergite with 



caudal margin rounded, not acutely produced ; Bolivia adspersa 



Inner nodule of left cercus broadly rounded or truncate apically ; right hemi- 

 tergite with an acute caudal angle terminated by a narrow sclerotic 

 spine 2 



2. Prothorax and pterothorax unicolorous; composite left paraproct (LPPT-1- 



LCB) with a small, domelike, echinulate nodule near posterior margin or 



with surface of inuer apical angle at least echinulate 6 



Prothorax usually distinctly paler than pterothorax (except in surinametv- 

 sis) ; LPPT+LCB without such a nodule or echinulations 3 



3. LPPT+LCB with a sharp, sclerotic projection at inner apical angle; left tergal 



process (10 LP) with outer portion acutely pointed, or irregular, apex may 



be turned forward; northern South America trinitatis complex 



LPPT+LCB with only a blunt projection, or none, at inuer apical angle; 

 10 LP with outer portion narrowly or broadly rounded distad 4 



4. 10 LP with outer portion broadly rounded, broader than long (fig. 60) ; thorax 



concolorous; Surinam surinamensis 



10 LP with outer portion narrowly rounded, longer than broad; thorax 

 usually bicolorous , 5 



5. 10 LP greatly elongated, about four times longer than broad ; cleft originating 



at apical fourth (fig. 37) ; Argentina trachelia 



10 LP much less elongated, less than three times longer than broad; cleft 

 originating just distad of apical half (fig. 51) ; Paraguay schadei 



6. LPPT+LCB without a distinct echinulate nodule; Brazil davisi 



LPPT+LCB with a distinct echinulate nodule at caudal margin 7 



7. 10 LP with outer portion narrow, fingerlike, outline even (fig. 49) ; 



Paraguay confusa 



10 LP with outer jwrtion broad, at least basally, irregular in outline 8 



8. 10 LP with inner talonlike portion gradually, evenly curved outward (fig. 45) ; 



Bolivia tenuis 



10 LP with inner talon abruptly curved outward, almost at 90° (fig. 41) ; 

 Argentina birabeni 



PARARHAGADOCHIR TRINITATIS TRINITATIS (Saussure) 



FiGUEES 26, 29 



Emlia trinitatis Saussi-be, 1896a, p. 293 ; 1896b, p. 352, fig. 13.— Enderuein, 1912, 

 pp. 52, 106 (misspelled as trinitatensis p. 30).— Navas, 1918, p. 99. 



