NEUROPTERA PLANIPENNIA. 147 



There are four species of Chiysopida?, referable to two genera, each of 

 them extinct; Chrysopidse have not before been recognized in Tertiary strata, 

 the single species poorly figured by Andra, and never carefully studied, 

 being much more probably one of the Hemerobidi?. These two genera, 

 called Palseochrysa and Tribochrysa, are allied to the living Xothochrysa, 

 bat differ from modem types in the zigzag course of the upper cubital vein, 

 and in its direction, which is through the middle of the wing, as well as by 

 the smaller number of sectors and the entire absence of any transverse 

 series of gradate veinlets ; Palseochrysa is represented by a single species, 

 Tribochrysa by three, and the genera differ from each other in the course 

 of the upper cubital vein, which in Palseochrysa is direct and bordered by 

 comparatively uniform cells, while in Tribochrysa it is doubly Ix-nt in the 

 middle, and is therefore bordered by very unequal cells. Two species of 

 Panorpida? have been found, one of which is referable to a new genus, Hol- 

 corpa, which differs from Panorpa in the entire absence of cross-veins, and 

 is remarkable for the spots on the wings. All these have been discovered 

 at Florissant only. No planipennian Neuroptera have been found in the 

 Green River shales, but the Tertiary beds of British Columbia have fur- 

 nished a single species of Hemerobidae, belonging to an extinct genus allied 

 to Micromus, and which I have called Bothromicromus ; and we have re- 

 mains of one of the Sialida? from beds of Laramie age in Colorado, which is 

 introduced here. 



The number of species of Tertiary Planipennia is nearly doubled by the 

 discoveries already made in the American Tertiaries, but the families, and es- 

 pecially the genera, are very differently represented on the two continents : 

 thus the Raphidiida? have in Europe only one species of Inocellia, while, 

 on the other hand, the Hemerobida? show one or more species each of 

 Nymphes, Sisyra, Hemerobius, and Osinylus. The Chrysopidse, as stated, 

 are unrepresented, although two species are known from the Jura. The 

 Panorpida? have one species of Panorpa and three of Bittacus. while thpre 

 are also two species of Ascalaphus and one each of Myrmeleon, Chau- 

 liodes, and Coniopteryx, belonging to families not found fossil in this coun- 

 try. (September, 1883.) 



