WICKHAM: new MIOCENE COLEOPTERA from FLORISSANT. 475 



Type.— 'No. 2,632 M. C. Z. Florissant, Col. (No. 3,931 S. H. 

 Scudder Coll.). 



The characters shown are those of Trirhabda, though at first sight 

 the specimen does not give the impression of belonging to that genus 

 which is well represented in North America today. The size is al)out 

 equal to that of T. comrrc/cns or T. attcnuata. 



Trirhabda megacephala, sp. nov. 

 Plate 12, fig. 2. 



Form elongate, parallel. Head large but not so wide as the pro- 

 thorax. Eyes not well defined. Antennae damaged but showing six 

 of the intermediate joints which are slender, not serrate, subequal, 

 each a little more than twice as long as wide. In life, the antennae 

 must have reached at least to the middle of the elytra and probably 

 beyond that point. Prothorax badly injured but what remains shows 

 it to have been not far from twice as broad as long. Scutellum small. 

 Elytra four times as long as the prothorax, apices rounded. Abdomen 

 showing five nearly equal segments which can be seen through the 

 elytra. Legs wanting. Length, to elytral apices, 8.70 mm.; of the 

 elytra 5.80 mm. 



Described from one specimen. 



Type— No. 2,633 M. C. Z. Florissant, Col. (No. 3,166 S. H. 

 Scudder Coll.). 



The entire upper surface is minutely punctulate and finely hairy. 

 The size and form are those of Trirhabda and it seems proper to place 

 it here provisionally. 



Trirhabda majuscula, sp. nov. 

 Plate 12, fig. 1. 



Form moderately elongate. Head abnormally exserted, rounded, 

 minutely punctulate and clothed with fine, dark, short, close hair. 

 Eyes rounded, widely distant on the vertex. Antennae slender, not 

 serrate, the individual joints too poorly preserved for description. 

 Prothorax about one and one third times as broad as long, sides 

 rounded, apex and base more or less truncate, surface minutely 

 punctured and clothed similarly to the head. Scutellum broad. 



