PLESIOFOENAX. 233 



are toothed in Fornax and simple in Plesiofornax, and the first joint of the hind tarsus 

 is elongate in the former or less long than the following joints in the latter ; but excep- 

 tions, few in number, occur in both characters in the two genera. In those species 

 which approach Fornax most nearly (P. elongatus and P. puellus), the first hind tarsal 

 joint is long, and, as if in compensation, the claw-joint short. Two species have been 

 observed to differ in the form of the last ventral segment in the two sexes (P. puellus 

 and P. sublucidus), while a third (P. glandifer) has a pubescent fovea in the propleural 

 triangle which may be peculiar to the female. 



The great increase in the number of species renders the table given by de Bonvouloir 

 entirely insufficient, there being now more known from the Central-American fauna than 

 are contained in his monograph. 



The following Table is presented as a brief synopsis of the Central- American species 

 at present known : — 



Third joint of the antennae much longer than either the second or fourth . 2. 

 Third joint of the antennae scarcely longer than the second and shorter than 



the fourth 8. 



2. Antennal groove indistinct, punctured similarly to the propleural 



triangle 3. 



Antennal groove distinct, smooth and shining in its entire length . 4. 



3. Propleural region densely punctured and subopaque pectoralis. 



Propleural region not densely punctate, more or less shining. 



Interocular ridge feebly elevated, broadly interrupted; punc- 

 tures of the propleurse closer than their own diameters > . . ligniperda. 



Interocular ridge distinctly elevated, narrowly interrupted; 



punctures of the propleural more distant paganus. 



4. Fourth joint of the antennas more than half as long as the fifth and 



longer than wide 5. 



Fourth joint of the antennae scarcely longer than wide, and not half 



as long as the fifth .' 11. 



5. Interocular ridge interrupted ; species usually piceous 6. 



Interocular ridge entire, well elevated ; species ferruginous . . . 9. 



6. First joint of the hind tarsus not longer than the others combined, 



usually shorter ; claw-joint long and slender, the claws simple . 7. 

 First joint of the hind tarsus distinctly longer than the others com- 

 bined; claw-joint short, claws toothed or dilated at the base ,. . 10. 



7. Clypeus nearly as wide at the base as the distance to the eyes. 



Thorax densely punctured confcederatus. 



Thorax not densely punctured, intervals smooth mandibularis. 



Clypeus much narrower at the base than the distance to the eyes. 

 Interocular ridge scarcely elevated, broadly interrupted at 

 the base of the clypeus ; antennae very long ( <J ) ; elytra 



obsoletely or not striate longicornis. 



biol. cente.-amee., Coleopt., Vol. Ill, Pt. 1, November 1890. 2 H 



