486 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY 



ISOMIRA FLORISSANTENSIS, sp. HOV. 



Plate 14, fig. 6-7. 



Form elongate oval. Head rather small, eyes not prominent. 

 Antennae long enough to reach slightly beyond the elytral bases, 

 relatively a little stouter than in the recent species known to me and 

 with the third joint proportionately shorter. They are scarcely 

 serrate and the distal joints are a little shortened. Prothorax about 

 one and two thirds times as broad as long, sides regularly rounding 

 to the apex which is much narrower than the base. Elytra each about 

 three times as long as wide, subparallel anteriorly to behind the middle, 

 apices conjointly rounded. Legs wanting except one of the anterior 

 pair which is of normal build. Length, from front of head to elytral 

 apex, 8.35 mm. 



Described from one specimen. 



Type No. 2,682 M. C. Z. Florissant, Col. (No. 510 S. H. Scud- 

 der Coll.). 



This is strikingly like our common recent /. sericca, (Cistcla scricea 

 Say) in appearance, but is larger. The weak sculpture of this genus 

 is not preserved in the fossil. 



HYMENORUS HAYDENI, sp. nov. 

 Plate 14, fig. 8. 



Form moderately elongate and apparently subparallel although the 

 insect is preserved lying partly upon one side and the exact shape is 

 thus obscured. Head rather large, though neither as long nor as wide 

 as the prothorax, eyes of good size, somewhat narrowly separated, 

 surface sculpture obliterated. Antennae slender, the joints following 

 the third subequal in length, as far as shown, and fully twice as long as 

 wide. If extended backward, the apex of the seventh joint would 

 reach about to the basal prothoracic margin. Prothorax, as preserved, 

 somewhat less than one and one half times as wide as long. Elytra 

 approximately three times as long as the prothorax, fairly sharply 

 pointed at apex, surface very obscurely striate but without visible 

 punctuation. The entire insect appears to be scabrous, but this is 

 probably due to the texture of the stone and the rather soft consis- 

 tency of the integuments before fossilization. Length, 7.15 mm. 



Described from one specimen. 



