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TETKAGONODEKUS. — NEMOTAESUS. . 173 



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The first and second pale fasciee approach each other very closely, leaving between 

 on the second to the fifth interstices only a small quadrate spot of the coppery- 

 ground-colour. 



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5. Tetragonoderus mexicanus. 







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eronoscelis mewicanas, Chaudoir, Etud. Monogr. des Masoreides, &c. p. 62. 



Hab. Mexico, Vera Cruz, Cordova {Salle), Coatepec, Tehuacan {Hoge) ; Guatemala, 

 near the city, San Geronimo, Rio Naranjo {Champion); Nicaragua {SalU). 



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Subfam. NEMOTABSINM 









The curious genus Nemotarsus, isolated from all other groups of Truncatipennes by 

 linear tarsi, pectinated claws, and the long spurs of its hinder tibiae, requires a 



separate subfamily for its reception, at least until intermediate forms are discovered 



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which may show in which direction lie its proximate affinities. Chaudoir placed it next 



to his Tetragonoderides, without including it in that group, its totally different facies and 



structural peculiarities evidently deterring him from incorporating it, notwithstanding 







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the common feature of long hind-tibial spurs. 





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NEMOTARSUS. 



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Nemotarsus, Leconte, Trans. Amer. Phil. Soc. x. p. 377 (1853). 



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Nematotarsus, Chaudoir, Etude Monogr. des Masoreides, &c. p. 74. 



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Chaudoir described five species of Nemotarsus from Tropical America, and one 

 (Leconte's type species) from California. Four of them are very feebly differentiated, 



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and may very well prove to be varieties or local forms of Dejean's N.fallax. The 

 following differ only from the latter in markings and very slightly in form, but, being 













represented by numerous individuals, seem deserving of separate names. 



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1. Nemotarsus rhombifer. (Tab. VII. fig. 8.) 



Flavo-testaceus, thorace vittis medianis duabus, elytrisque signatura communi x -formis (ramis eurvatis) literisque 

 posterioribus (pallidioribus) cum ramis inferioribus prsecedentis conjunctis et spatium commune rhomboidale 

 flavum includentibus fusco-nigris ; thorace latiusculo, lateribus rotundatis (postice rectis) angulis posticis 





modice elevatis ; elytris striatis, interstitiis convexis postice planis. 



Long, 2§ lin. (5 millim.). 



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Hob. Mexico, Jalapa {Hoge) ; Guatemala, Duenas {Salvin). 



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2. Nemotarsus limbicollis. 



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JV. rhombifero proxime affinis, differt solum thorace limbo (praecipue antice) fusco, disco immaculatp. 



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JJVil.;, -~*2 



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Hob. Mexico, Vera Cruz {Salle), Jalapa {Hoge); Guatemala, San Geronimo 

 {Champion). 



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