30 Mr. Ct. Meade-Waldo on Hob. Tahquitz Valley, San Jacinto Mfcs., California, 8000 ft., July 21 (F. Grinhell, Jr.). A female taken at the same time and place proves to be only P. poUfolii. Prosopis pasadence, sp. n. S . — A very small species, in every way related to P. mesillce, Ckll., but distinguished by the upward extensions of the lateral face-marks, which, instead of being short and broad, are long and slender, curving away from the orbits. The tubercles are variable, dark or spotted. Unlike the P. dujitata group, the outer margin of the lateral face-marks is even, without any notch or angle at the beginning of the upward process. The first abdominal segment is very shiny, the second dullish. ? . — Like that of P. cressoni, Ckll., but the wings greyish ; or when the clypeus is not entirely dark, like that of P. mesillce in its darker forms, but lateral face-marks pointed above, away from orbit, and upper margin of prothorax all black. Hah. Pasadena, California, April 8 to May 31 (F. GrianeU, Jr.) ; near Pasadena, at 1100 ft., July 21 (F. Gr inn ell, Jr.). V. — New Species of Diploptera in the Collection of the British Museum. By Geoffrey Meade-Waldo, B.A. (Published by permission of the Trustees of the British Museum.) Part I. During a recent rearrangement of this family in the National Collection I have found a number of species which are apparently undescribed ; of these species I have now written descriptions, which I hope to publish in two or three consecutive papers. In the present paper there are descriptions of new species of the families Masaridse aud Eumenida; (as far as the genus Rhynchium). All measurements of length are taken from the front of the head to the apical margin of the second abdomiual segment, except where the total length is expressly mentioned. The types are all in the National Collection.