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AEDISTOMIS. 



35 









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7. Ardistomis labialis. 



L 





. 





Clivina labialis, Chaudoir, Bull. Mosc. 1837, iii. p. 18 \ 



Mono 

















Hab. Mexico \ Toxpam, Cordova, Juquila 



O 



(Edge) ; Guatemala 





San Geronimo, Guatemala city (Champion); Honduras (Salle);. Nicar 



Chontales 









<j, 

















. 





Yar. picipes : antennis, partibus oris pedibusque piceo-fuscis ; thorace minus globoso, elytrisque striis minus 



impressis 



Hab. Guatemala, near the city (Champion) 



. 























Var. nanus : multo minor (vix 2 lin.), thorace cordato. 



Hab. Guatemala, Torolo (Champion). 











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Yar. dilatatus : minor (2 lin.), thorace dilatato, valde transverso. 



Hab. Guatemala, Zapote (Champion). 











8. Ardistomis tuspa 





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Ardistomis Tuspanensis, Putzeys, Monogr. Clivinides, p. 131 \ 





Hab. Mexico, Tuspan l , Cordova (Salle), Vera Cruz, Oaxaca (Edge). 

























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Typical specimens of the two preceding species, i. e. those which conform best with 

 the descriptions of their authors, seem specifically well defined. Those belonging to 

 A. labialis are larger (2 J lines), have a broadish subglobose thorax and (on the disk of 

 elytra) feebly impressed punctured striae ; whilst those referable to A. tuspanensis are 





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decidedly smaller (2J lines), have a rather narrow cordiform thorax, and more coarsely 







punctured and deeply-impressed elytral striae. Between these extremes, however, there 













. 



- 















• 



is, either in the same or in other localities, every grade of variation ; and I doubt if it is 

 possible to rigorously define the two species. This applies to examples having similarly 

 elongate oblong-ovate elytra ; but varieties occur in which the elytra are much shorter 

 and relatively broader. These have a prima facie appearance of distinct species ; but 

 as all details of their structure, and the characteristic arrangement of the striae near the 







. 





















base of the elytra, offer no differences, I prefer to consider them as varieties. The 



* 



dark-legged variety (A. picipes) from the neighbourhood of Guatemala city has a form 

 of thorax intermediate between that of A. labialis and A. tuspanensis, and the punctures 

 and striae of the elytra are less deeply impressed even than in the former of the two 





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species 



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With such evidence of the variability of A. labialis I doubt whether the following 







can be retained as distinct. 













9. Ardistomis propinqua. 











Ardistomis propinqua, Putzeys, Eevis. Gen. p. 214 



i 













Hab. Mexico, Oaxaca *, Cuernavaca, Puebla (Salle), Mexico city (Flohr). 



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