226 ENTOMOLOGICAL SOCIETY 



tooth nearly transverse, leading into a deep and distinct sinus followed 

 proxiinad by two indistinct, broadly rounded, subcoalesced tubercles, with 

 a single distinct tubercle in the upper row (Plate I, figs. 5a~5b); younger 

 forms have the forceps more slender, the teeth smaller, the tubercles 

 smaller, more distinct, and sometimes more numerous so that there may 

 be three, or very rarely four, contiguous in each row (Plate I, figs. 6a-6b); 

 Jap}x liberiensis, sp. ., Western Liberia, type in U. S. Nat. Museum. 



Right arm in adults with proximal edge of tooth distinctly sloping; no 

 conspicuous sinus immediately below the tooth, usually with an evenly 

 curved general sinus, similar to that of the left arm; tubercles mostly 

 more numerous, spaced as on the left arm 



Right arm of forceps with a single dentiform tubercle; left arm without 

 denticules beyond the broadly triangular tooth : J. creticus, sp. ., Crete, 

 Berlin Museum. (PI. II, figs. la-ib.) 



Both arms with numerous and distinct tubercles and denticules; teeth 

 distinctly convex on the distal edge 



Right arm maintaining its width to the tooth, beyond which it is some 

 what abruptly narrowed by an oblique edge armed with very distinct 

 rounded denticules: J. obliquus, up. ;/., Liberia, U. S. Nat. Museum. (PI. 

 II, figs. 2a-2b.) 



The two arms very similar in size and shape, distinctly narrowed from 

 near the base ; both sinuses evenly curved like the left arm of the last 

 species 



Forceps slender; teeth located somewhat below the middle; denticules 

 small and indistinct: J.javanicus, sp. ft., Java, U. S. Nat. Museum. (PI. 

 II, figs. 3a-3b.) 



Forceps robust; teeth located well above the middle; denticules fewer, 

 large and distinct: J. africanus Karsch, Togo Colony, Berlin Museum. 

 (PI. II, figs. 4 a- 4 b.) 



EXPLANATION OF PLATE I. 



The figures are camera tracings of the ventral aspect of the forceps. In 

 some cases the outline of the superior row of tubercles has been placed 

 upon the drawing opposite that of the lower row. The figures are not 

 drawn to a uniform scale, which would have resulted in some being too 

 small to make the armature visible, or others would have occupied an en 

 tire plate. 



P^igs. la-ib. Right and left arms respectively of the forceps of Japyx 

 athenarum. 



2a-2b. Same of J. hubbardi. 



3a~3b. J. bidens. 



4a~4b. J multidens. 



5a~5b. J. liberiensis. 



6a-6b. J. liberiensis, a younger stage. 



