E. H. Sellards — Types of Permian Insects. 169 



Delopterum latum sp. n. Text figure 17. 



This species is broader and slightly larger than the type 

 species. The sector arises very early. The sector is three 

 branched. A fourth branch is given oif but is lost in the 

 wing membrane. Cubitus is branched. 



Length of front wing, 5 mm ; width, If mm . Type, No. 94. 



Urba punctata gen. et sp. n. 



This genus is characterized by a slender elongate anal area 

 traversed by three or four veins. The wing membrane has a 

 punctate appearance, due probably to the presence of short 

 spines bordering the veins. 



Length of front wing, 9 mm ; width, 3 ram . Type, No. HIT. 



Correlation of the Insect-bearing Horizon. 



The locality from which the insects described in this paper 

 were obtained is three and one-half miles southeast of Banner 

 City in Dickinson County, Kansas. The fossiliferous horizon 

 occurs close to the top of the Paleozoic section of this part of 

 the state and near the line of contact with the overlying 

 Cretaceous. Fossil plants are associated with the insects. The 

 matrix holding the fossils varies from an impure fine-grained 

 laminated limestone to a hard concretionary limestone. Most 

 of the insects were obtained from the laminated rock, while 

 the plants come largely from the concretionary limestone. 

 When the fossils were first discovered they were regarded as 

 probably occurring in the Marion formation. 



As a result of stratigraphic studies made for the Kansas 

 State Geological Survey during the past summer, J. W. Beede 

 states that he has shown the plant and insect horizon to occur 

 within the Wellington shales lying next above the Marion, 

 and immediately under the Cretaceous. * 



Aside from doubtful forms, the paper contains descriptions 

 of sixty species and thirty-five genera, all of which are new. 

 To complete the faunal list, the cockroaches, not included in this 

 paper, but described elsewhere, f should be added to this num- 

 ber. Of this family ten species, all new, have been recognized. 

 They are referred to two genera, one of which is new. Of 

 groups larger than genera the following have been recognized 

 in the Wellington shales : Odonata, Plecoptera, Megasecoptera, 

 Oryctoblattinidse, Protorthoptera, and Paleoblattidse. 



The order Odonata is represented in the Wellington horizon 

 by at least one form constituting a new genus and species. The 

 Odonate phylum is known as early as the Coal Measures, being 



* Letter of Sept. 16, 1908. 



f Paper prepared for the Kansas State Geological Survey. 



