240 PROC. ENT. SOa "WASH., VOL. 56, NO. 5, OCTOBER 1954 genesia Eaton, ChanTcagensia Buldovskii (== Chanlcgenesia Buldovskii), Cheirogenesia Demoulin, Mortogenesia Lestage, Palingenia Burmeister, Plethogenesia Ulmer (= Tritogenesia Lestage). Superfamily PROSOPISTOMATOIDEA, new rank (= Baetiscoidea) Family Baetiscidae Subfamily Baetiscikae. — A single genus is included here: Baetisca Walsh. Family Prosopistomatidae (= Binoculidae) Subfamily Prosopistomatinae. — A single genus is included here: Binocidus Geoffroy (= Prosopistoma Latreille, Chelysentomon Joly and Joly). TWO NEW CHIGGERS FKOM THE CENTRAL STATES (A carina, Trombictjlidae)!-2 By D. A. Crossley, ,Jr. and Lons J. Lipovsky, University of Kansas, Lawrence Investigations at the University of Kansas have disclosed two new species of chiggers belonging to the genus Euschdn~ gasiia. Both were taken from mammals inhabiting the short-grass prairies and canyons of the high plains region in the central states. These are summer chiggers and are known only from limited localities, as listed. Both species have been reared by one of us (Lipovsky) to the nymphal stage; descrip-tions of the nymphs will be published elsewhere. In the following descriptions the terminology used is that of "Wharton et al., 1951. All measurements are in microns. De-scriptions are based on the holotypes, with variations in the paratypes noted. Euschongastia cynomyicola, new_ species (Figs. 1-5) Diagnosis. — A Euschongastia characterized as a larva by a trifureate palpal claw, galeal seta with four or five branches, sensillae obovoid, two genualae I, subterminala and parasubterminala I present, tibiala III present, ventral setal formula beginning 2-6. Body. — Shape almost spherical when engorged. Color in life, white. Length and width of body of holotype 369 by 341 (engorged). Eyes, two on each side; posterior eye smaller and situated on a plate ap-parently independently of anterior eye ; distance across both eyes of one side 18, in holotype. ^The studies upon which this paper is based were conducted under a contract, N6 ori 220 Task Order II, between the University of Kansas and the Office of Naval Eesearch. ^Contribution No. 865 of the Department of Entomology, University of Kansas.