9 
Obs. — There can be no doubt as to the position of this fossil, as the 
structure of the limbs and caudal appendages, to say nothing of the general 
facies, clearly indicate its Ephemerid nature. The fore-wing, which is 
preserved in only one specimen, although presenting the reticulated venation 
characteristic of the family, is somewhat peculiar in shape, inasmuch that the 
inner angle of the hind margin is very widely removed from the base. In 
this respect it is approached by certain species of the genus Siphlurus. 
According to Mr. Scudder,* the Ephemeridaj are undoubtedly represented in 
the Oolite of Solenhofen, and the Siberian Jurassic rocks. The family is also 
represented in Continental Tertiary deposits, and figures largely in amber 
inclusions. 
Locality and Sorizon. — Eox and Partridge’s claim. Red Hill, near 
Emmaville, New England. Youngest Tertiary stanniferous lead of the 
Vegetable Creek Tin-field ; Upper Tertiary {Mr. T. TF. Edgeworth Lavid.) 
COLEOPTERA. 
Sub-order — SERRICORNIA. 
Family — B UPBESTID^. 
MESOSTIGMODERA, gen. nor. 
Mesostigmodera typica, sp. nor. 
Plate II, Pigs. 1-3. 
Sp. Char. — Elytra elongate, rather strongly convex, slightly impressed 
in the middle at the base, the outer margin narrow, moderately reflexed, and 
arcuately narrowed posteriorly from the apical two-thirds ; the apex obtuse, 
slightly produced, and without terminal teeth or spines ; the suture slightly 
elevated ; the whole surface of the wing is covered with very regular rows of 
large shallow pits or punctures which extend from the base to the apex, the 
interstices moderately broad, and closely covered throughout their entire 
length with very small elevations or tubercles ; these elevations are irregularly 
arranged, those towards the base becoming a trifle larger in size, and some- 
what more conspicuous; each of the large punctures of the longitudinal 
series is surrounded by five or six of these elevations, and the space behveen 
the suture and the sutural line is provided with two irregular longitudinal 
rows of similar elevations ; the shoulder very slightly prominent ; the margin 
impunctate and moderately broad. Length, 12 mm.; greatest width, 4 mm. 
* Bull. U. S. Geol. Survey, 1886, V, No. 31, p. 54. 
