158 TERTIARY INSECTS OF NOKTli AMERICA. 



Length of head, 2 mm ; breadth of same, 0.8'""' ; length of thorax, 4.5 mm ; 

 breadth of same, 2.4 nim ; breadth of neck, 0.3 mm ; probable length of pro- 

 thorax, 2 mm ; its breadth at base, 1.75 mm ; length of fore wing, 7 mm ; its prob- 

 able breadth, 2.5 mm . 



Florissant. One specimen, Nos. 9373 and 10389. 



Another specimen shows the apical half of two overlapping fore wings, 

 which differ so little from the preceding that I place it here at least provis- 

 ionally ; it differs principally in the point of immediate origin of one of the 

 veins terminating in the apex, which in the specimen first described origi- 

 nates fh the distal, in this specimen in the proximal of the two cells imme- 

 diately below the pterostigrna. 



Florissant. One specimen, No. 2603. 



3. INOCELLIA TUMULATA. 

 PI. 14, Fig. 15 ( 3 ). 



The species is represented by a single specimen and its reverse in 

 which the entire body and nearly the whole of the four wings are pre- 

 served. The head is obscure and ill-defined in part, with no appendages 

 preserved, obpyriform in shape, being broadest in the middle of the 

 anterior half or about three-fourths the length, the front broadly rounded, 

 behind tapering rapidly, so that the base is narrower than the narrow neck 

 formed of the prothoracic segment, This is nearly four times longer than 

 broad, less than half as broad as the head and apparently equal, though 

 the imperfection of the part renders this doubtful. The meso- and meta- 

 thoracic mass is robust, nearly twice as broad as the head, while the abdo- 

 men is only a little broader than the head, equal, and somewhat longer 

 than the rest of the body. The legs, excepting the fragment of a hind 

 femur, are not preserved. 



The wings, and especially the front pair, which is considerably longer 

 than the hind pair, are longer than the thorax and abdomen together and 

 more than three times as long as broad. One front wing is almost entirely 

 preserved and separate from the others, so as to be easily studied; the 

 cither front wing, of which only a fragment can be seen, overlies the over- 

 lapping and reversed hind wings ; they do not so closely overlap as to 

 confuse the neuration greatly, and hence nearly the whole can be deter- 



