476 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.49. 



radius well before the middle of the wing; radial sector with three 

 long simple branches, the third appearing as the main stem; at the 

 end the sector branches again, sending a branchlet obhquely down- 

 ward toward the end of the third branch, this emitting four delicate 

 V-like pairs of nervures to the margin; media straight, probably 

 branched below, but this can not be clearly made out; anal region 

 obscured, owing to the folding. Tliere are crossveins at intervals, in 

 the manner of Corydalis. 



There appears to be a certain affinity with Solenoptilon, from the 

 Lias of Mecklenburg, but no very close resemblance. I naturally 

 asked myself whether the specimens could represent the hind wings 

 of Orthophlebia. They are, however, evidently not Panorpoid at all, 

 but belong to the Sialoids, and presumably to the Siahdae. The 

 characteristic features are the folding of the wing and the unbranched 

 first branch of the radial sector. The narrow costal cell as well as the 

 folding appear to indicate hind wings. It seems very Hkely that the 

 problematical Or^^op/zZeim longissiTnaQdehei belongs to NematoiMebia. 



Genotype. — Nematophlehia plicata, new species. 



NEMATOPHLEBIA PLICATA, new species. 



Plate 60, figs. 5-6. 



Wing about 10 mm. long; stigmatal region clouded and apical 

 field suffusedly dusky, but no maculation; veins fuscous, deHcate 

 crossveins palhd; apical part of radius minutely speckled. 



Lias; Gloucestershire or Warwickshire (Brodie). Lacoe Coll. 3478 

 ( = type) and 3479. 



Holotype.—C&t. No. 61395, U.S.N.M. 



PALAEOHEMIPTERA. 



MESHEMIPTERON, new genus. 



Anterior wing with the apical field apparently more or less mem- 

 branaceous, with delicate veins; subcosta separating from radius 

 near or about (probably rather before) middle of wing, forming a 

 long triangular cell with the basal angle very acute, the upper apical 

 acute, and the lower apical obtuse; media branching about level with 

 middle of cell in radio-subcostal fork, its upper branch widely sepa- 

 rated from radius; cubitus simple until it reaches the apical field. 



Genotype. — Mesliemipteron incertum, new species. 



MESHEMIPTERON INCERTUM, new species. 



Plate 60, fig. 9. 



Anterior wing as preserved 6.5 mm. long; if complete, it would per- 

 haps be 8.5; no markings visible. 



The specimen is unnumbered, but was collected by Brodie in the 

 Lower Lias, and comes from the Lacoe collection. It is presumably 



