2 NEW SPECIES OF SLATEROBIUS HARRINGTON WITH COMMENTS ON THE ECOLOGY AND DISTRIBUTION OF THE GENUS (HEMIPTERA, LYGAEIDAE)

Two new species, Slaterobius chisos Slater and Sweet from the southwes tern United States and Slaterobius nigritus Slater and Brailovsky from Mexico, are described and illustrated as are details of the genitalia . A key to the species of Slaterobius is provided. Slaterobius insigni s is recorded from Mexico and the fifth instar is described and illust rated. Slaterobius quadristriatus, previously known only from New Jers ey and recorded for the first time from Wisconsin and Michigan, is the only arboreal species of the genus and feeds on pine seeds. The myrme comorphic nature of the insects is discussed. Based on the known distr ibution and ecology of the species, a vicariant pattern of speciation is proposed, based on Pleistocene climatic changes.