(459) onl)' example we have seen from the Guiaiia-i. The centre of the thorax and base of abdomen above are darker than in Venezuelan individuals ; tlie inner border of the central line of the forewing is paler, being almost pure white near the base ; the band of the hindwing is much sliaded with i'nscous. The outer sjjur of the midtibia is shorter than the inner one. 7. Xylophanes amadis meridanus subsji nov. .XijIii/ilKinejt (iiii'idit anuiilh, Rothschild & Jontan (iiec Stull, 1782), Reoisiim of Spldui/iilue, l.r. t. 9. fig. 15 (190:!) (partim ; Merida). cj?. The form figured I.e. may be named as above. The outer sjmr of tlie midtibia is longer than, or as long as, the inner one. A series from Mi'rida, Venezuela. A NEW SPECIES OE THE DIPTEROUS GENUS ACHIAS Fabr. (Family ORTALIDAE). Bt EKNEST E. AUSTEN, F.Z.S. (PiMislied 1)1/ permission of the Trustees of the llrilish Musenm.) Achias rothschildi sp. nov. (Plate XV., figs. 5-0). (??. c?. — Length (five specimens) 13-.") to 10 mm.; length of eye-stalk, measured from base of stalk to inner margin of eye (five specimens) 8'5 to 250 mm. ; width of head across occiput immediately below base of eye-stalks 4 to 5 mm. ; length of wing 14 to 100 mm. ?. — Length (two specimens) 145 mm.; widtli of head across vertex, including eyes, 7 to 70 mm. ; length of wing 10 to IC'5 mm. Resembling Achias lotigicideiis Walk, and A. lafividens Walk, in coloration and markings of body and wings ; distinguished from both by the femora being without sharply marked dark tips (tliough the distal extremities of the front and middle femora in the S and of the front femora in the ? nsnally exhibit a dark longitudinal streak above), by the presence of a well-marked pale band (interrupted on the upper side) on the tibiae, and by the great development of tiie callosity on the inner side of the tijis of the hind tibiae. Head. — Front orange-ochraceous,* more or less irregularly and finely mottled with clove-brown ; face and jowls ochre-yellow or bnff-yellow, antennal cavities dark brown or brownish, a clove-brown streak on each side, running from base of eye-stalk in c? and from lower margin of eye in ? uearly to lower margin of jowl, and a similar but usually somewhat broader mark extending from bottom of inner margin of each antennal cavity to edge of buccal cavity ; occiput buflf-yellow above, * For names and illustrations of colours, sec Kidgway, .-1 Xomrtwhtturi' of Colon for Xutitralijtts (Boston : Little, Brown k Co., IHSIJ).