iV^o. 2.J SCUDDER ON PALEONTOLOGY OF FLORISSANT, COLORADO. 2!) J 



nine-tenths of all the Hoinoptera, some of the species being represented 

 by 40 or. 50 specimens. There are a few large Fnlgoridae; one has the 

 long recurved process of the head almost perfectly preserved. Two gigan- 

 tic Aphrophorina have already been described as belonging to a new 

 genus, and been named Petrolystra gigantea and P. heron ; but as a whole 

 the species are of medium size, with some minute and slender forms, the 

 position of which is as yet undetermined. Plant-lice are common, and 

 iuclude probably 8 species, all Aphidiinae excepting one, which is 

 referred to Schizoneuridae j an entire plate is devoted to them. Many 

 of the Homoptera have their markings beautifully preserved ; especially 

 is this the case in a variegated Typhlocypha or allied genus, and the 

 venation of others is as complete as in the living form. No Stridulantia 

 have occurred. 



Sixty or seventy specimens of Orthoptera have been found, all the 

 families being represented excepting Gryllidae and Mantides. Six speci- 

 mens and nearly as many species of Locustariae are present ; the finest, 

 belonging to a new genus, has been described under the name of Li- 

 thymnetes guttatus. There are about the same number of Acridii, a 

 siugle species of Phasmida, and two or three Blattariae, one of which 

 has been described under the name of Homoeogamia ventriosus. But the 

 mass of Orthoptera, including about 50 specimens and 8 to 10 species, 

 belong to the Forficulariae ; two of them, Lahidura tertiaria and L. 

 IWwpliila^ have been described, but they are among the least interest- 

 ing, several of the species exhibiting forceps of very great length ; an 

 eutire plate has been devoted to them in a forthcoming report, and the 

 remaining Orthoptera will occupy another. 



The Neuroptera are made up in large part of Phryganidae, but no 

 larval cases have been preserved ; there are about 100 specimens repre- 

 senting 15 or 20 species which are determinable, and which occupy one 

 plate of the report and parts of others ; besides these there are several 

 hundred which perhaps a severer study will classify ; one species has 

 wings 2 centimeters long, while others are minute; several of the sub- 

 families appear to be represented, true Phryganidae certainly, and prob- 

 ablj' Ehyacophilidae, Leptoceridae, and Hy dropsy chidae. A single fine 

 species of Pauorpidae has been found, forming a new genus, and already 

 described as Holcorpa maculosa. Seven or eight species of Plannipeu- 

 nia, including fifteen specimens, occupy a i)late by tliemselves ; they 

 mostly belong to Eaphidia and Nothochrysa, or to new genera nearly 

 allied to them or to Chrysopa and Nymphon. A dozen specimens of 

 Odonata have occurred, among them two species each of Aeschna, 

 Agrion, and a new genus allied to Podagrion and Dysagrion (the latter 

 of the Green River shales), which I shall call Lithagrion ; the wings are 

 preserved, some of them, most exquisitely ; besides these two larvae, 

 one of an Aeschna, the other of an Agrion. A single adult specimen 

 and one or two larvae of Ephemeridae have occurred; a single species 

 of Perlidae, represented by adult specimens and others by immature 



