The first record of Merycomyia whitneyi (Johnson), tribe Bouvieromyiini (Diptera: Tabanidae), from Texas and from west of the Mississippi River

The first collections of Merycomyia whitneyi (Johnson), (Diptera: Tabanidae: Chrysopsinae: Bouvieromyiini) from Texas and from west of the Mississippi River are reported, and the Nearctic species of the Tribe Bouvieromyiini are discussed

Spectral stability of Prandtl boundary layers: an overview

In this paper we show how the stability of Prandtl boundary layers is linked to the stability of shear flows in the incompressible Navier Stokes equations. We then recall classical physical instability results, and give a short educational presentation of the construction of unstable modes for Orr Sommerfeld equations. We end the paper with a conjecture concerning the validity of Prandtl boundary layer asymptotic expansions.Comment: 17 page