28 The Graspedosomatidae of North America. 



we believe the^^ are woi-th3- of being put forward as the most 

 satisfactor}^ yet suggested. 



Synopsis of Genera. 



( Eyes present R 



\ wanting C 



V Segments 26, with numerous dorsal carinse Branneria 



I 28 or 30 I> 



\ Sixth male legs crassate, the ninth unarmed ZygonopiiS 



ij normal, claw of ninth large Scoterpes 



( Ninth male legs 2-iointed, without claw E. 



\ 4-5-jointed, with a claw F 



{ Third male legs with coxae produced G 



\ normal H 



{Ninth male legs embracing a bifid jjlate ; dorsum granular. 

 Pseudotreiuia 

 without plate ; not granular I 



( Second male legs strongly crassate; seventh legs normal. .Undervi^oodia 



I very slender; coxae of seventh enlarged Caseya 



( Last j oint of male legs hispid ; segments 30 Conoty la 



\ not hispid; segments 28 Tricliopetaliim 



( Ninth male legs distally clavate; second joint slender Bactropiis^ 



\ hamate ; second j oint robust C leidogona 



The presence or absence of eyes may not, of itself, be a suffi- 

 cient generic character, as Latzel has said, though it certainly 

 shows considerable divergence. In the preceding table this char- 

 acter is used merely as a convenient means of separation ; the 

 other features we believe to be of diagnostic value. 



The external differences between the genera are not inconsider- 

 able and it is possible to separate them without dissection. To- 

 facilitate this we add a key in which mere external characters are 

 employed. That new forms will soon be discovered which will 

 interfere with the continued utility of these kej^s, we can but 

 expect. 



Artificial Key to Genera. 



( Eyes present B 



( wanting •. C 



( Dorsum rough with numerous carinse or granules D 



I smooth, except the six setigerous tubercles E. 



{ Sixth male legs crassate ; the ninth unarmed ZygonopilS 



\ normal, claw of ninth large Scoterpes 



^ Length 6 mm. ; segments 26 ; dorsum carinate Branneria 



I 18-30 mm. ; segments 30; granulate Pseudotreiuia, 



