474 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Type.— No. 2,629 M. C. Z. Florissant, Col. (No. 507 S. H, 
Seudder Coll.). 
Intermediate in size between D. exesa and D. bowditchiana, both 
from these shales. 
DIABROTICA FLORISSANTELLA, Sp. NOV. 
Plate lipfigys. 
Form similar to that of the living D. longicornis. Head of moder- 
ate size, the antennae showing only nine joints but these, if straight- 
ened out, would reach fully two thirds of the distance to the abdominal 
apex. Prothorax short, the form too much distorted for description. 
Elytra distinctly but finely longitudinally striate, the striae apparently 
not punctured. Legs normally slender. Length, 6 mm. 
Described from one specimen. 
Type.— No. 2,630 M. C. Z. Florissant, Col. (No. 9,566 S. HL. 
Seudder Coll.). 
While the species of Florissant fossils assigned to Diabrotica do not 
offer any very striking characters, it seems worth while to give this | 
one a name since if fairly well preserved it will usually be separable | 
from the other three by the long antennae and the distinct elytral 
striae. 
i 
DIABROTICA EXESA Wickham. { 
; 
One specimen, No. 2,631 M. C. Z. (No. 9,193 S. H. Scudder Coll.). | 
TRIRHABDA SEPULTA, Sp. nov. 
Plate 11, fig. 6. | 
| 
Form about like that of the recent 7. canadensis. Head finely | 
punctate, the punctures extensively confluent forming rugae. Anten- | 
nae (possibly not preserved to the extreme tip) not quite as long as | 
the elytra, the basal five joints proportioned about as in 7’. convergens. 
Prothorax with the disk scarcely visibly punctulate, sides only feebly _ 
arcuate. Elytra not at all striate, sculpture very minute. The entire © 
upper surface of the body, including the antennal joints, is clothed | 
with fine hairs, quite close-set on the elytra but less so on the head and | 
pronotum. Legs wanting. Length, 7.70 mm.; of elytron,5 mm. 
Described from one specimen. ie 
