486 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
ISOMIRA FLORISSANTENSIS, Sp. nov. 
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. 5108S. H. Seud- 
der Coll.). 
This is strikingly like our common recent I. sericea, (Cistela sericea 
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. 
