16 OTIOEHYNOHID^. 



[Horn. 



genera of the second division. The side pieces in the other two tribes are 

 very narrow and tlie sutures nearly always obliterated. 



Tribe I. brachyderini. 



Rostrum at least as long as the head and slightly dilated at tip, which is 

 more or less emarginate. Front flat, rarelj"^ with a slight depression 

 between the eyes. Scrobes moderately deep, usually distinctly limited and 

 very oblique. AntenmB moderate, scape attaining the eyes rarely {Trigo- 

 noscuta) passing them. Thorax without ocular lobes or fimbriae and not 

 or very feebly emarginate beneath. Scutellum usually distinct. Elj^tra 

 oval, not wider than the thoi'ax. Mesosternal epimeron small, episternum 

 attaining the elytra. Episternum of metasternum nari-ow suture usually 

 distinct in its entire length. Abdomen with the first two segments (except 

 in Gr. iv), separated by an arcuate suture, segments 3-4 short, conjointly 

 not or but little longer than the second. 



As thus constituted, the tribe is widely different from that defined by 

 Lacordaire under the same name. From it those genera have been re- 

 moved in which the mesosternal side pieces are diagonally divided and the 

 metasternal episterna moderately wide and dilated in front. These form 

 tribes in the next division. It is, however, extremely difficult to fix tribal 

 limits with any degree of certainty, as every character upon which classifi- 

 cation has been based, exhibits a degree of variability almost unparalleled 

 in any other series of Coleoptera. The ocular lobes of the thorax especially 

 exhibit this tendency, and the pointed outline of the eye which usually 

 accompanies the lobe is by no means in better condition. The eye may be 

 more nearly circular in outline with a lobe than it is without the lobe. 



As thus constituted, the tribe contains the following groups : 



Third joint of all the tarsi wider than the second and deeply bilobed. 

 Tibiae normal, not dilated at tip. Scape not passing the eyes. 



Posterior coxae small, very widely separated Minyomeri. 



Posterior coxae normal intercoxal process triangu- 

 lar or oval. 

 Antennae scalj^ body beneath densely scaly. Elytra 



emarginate at base, thorax closely applied Epicaerl. 



Antennae shining, sparsely hairy, body beneath 

 nearly naked. 

 Tips of hind tibiae feebly cavernous, a double row 



of spinules. First abdominal suture arcuate... Barynoti. 



Tips of hind tibae open, a single row of spinules. 



First abdominal suture straight or nearly so .. Hormorl. 



Anterior tibiae dilated at tip ; scape long, passing the 



^y^^ • Trlg^onosciitfe. 



Third joint of tarsi not wider than second, and feebly 



emarginate Calyptllli. 



