NEUROPTERA— PLANIPENNIA. 147 



There are lour species of Chrysopidse, referable to two genera, each of 

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

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

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

 called Pah)?ochrysa and Tribochrysa, are allied to the living Nothochrysa, 

 but diifer from modern 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 veiuiets ; Palseochrysa is represented by a single species, 

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

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

 comparatively uniform cells, while in Tribochrysa it is doubly bent in the 

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

 Panorpidje 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 Tertiarj^ beds of British Columbia have fur- 

 nished a single species of Hemerobidse, 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 Raphidiidse 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 Osmylus. The Chrysopidfe, as stated, 

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

 Panorpidpe have one species of Panorpa and three of Bittacus. while there 

 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.) 



