AMERICAN COLEOPTERA. 125 



B.^Margin of elytra not interrupted posteriorly, without internal plica. 



Front short, labrum impressed Tribe XXV. Licinini. 



Front normal. 

 Penultimate joint of labial palpi bisetose. 



Posterior cox£e separated Tribe XXXIII. Egini. 



Posterior coxae contiguous. 

 Head elongate, prolonged behind the eyes, neck constricted and dilated 

 behind in a semiglobular condyle. 



Elytra entire Tribe XXVIII. Ctenodactylini. 



Elytra truncate. 

 Terminal joints of palpi similar, cylindrical or slightly oval. 

 Three basal joints of antennre glabrous. Ungues simple. 



Tribe XXIX. OdacantMni. 

 Four basal joints glabrous; elytra explanate. Ungues simple. 



Tribe XXXI. Mormolycini. 

 Terminal joints of palpi dissimilar, the labial triangular the maxillary 

 cylindrical. Thorax feebly margined at sides. 



Tribe XXXII. Agrini. 

 Head not prolonged behind the eyes, neck not semiglobose. 

 Elytra rounded at tip. Ungues simple. ..Tribe XXVII. Anchonoderini. 

 Elytra obliquely sinuate. Ungues simple or feebly pectinate. 



Tribe XXVI. Platynini. 

 Elytra truncate at tip. 

 Thorax with distinct lateral and basal setigerous punctures. 

 Anterior tibiae slender. Paraglossse membranous. 



Tribe XXXIV. Lebiini. 

 Anterior tibise rather stout, gradually broader to tip. Paraglossfe 



corneous Tribe XXXV. Helluonini. 



Thorax without lateral or basal setae. 

 Tibise carinulate and serrulate externally. 



Tribe XXXIX. Orthogonini. 



Tibife with the outer edge rounded Tribe XXXVIII. Cratocerini. 



Penultimate joint of labial palpi plurisetose in front and always longer 

 than the terminal joint. 

 Eyes normal, their lower margin very close to the buccal opening. First 



antennal joint elongate Tribe XXX. Dryptini. 



Eyes large, prominent, distant beneath from the mouth. First antennal 

 joint not elongate. 



Tibial spurs rather short Tribe XXXVII. AntMini. 



Tibial spurs long, those of the posterior tibiae dissiniilar. 

 , Tribe XXXVI. Graphipterini. 



The preceding table contains twenty-four tribes of which seventeen have 

 representation in 'our fauna. There is no tribe pecuhar to our fauna. 

 Those not represented are S i a g o n i n i, jNI o r m o 1 y c i n i, A g r i n i, 

 Orthogonini, Cratocerini, Anthiini and Graphipterini. 

 The third and fifth being the only ones with representation in our 

 Hemisphere and these so far from our limits that it is not likely they 

 will ever be found with us. 



