46 INSECUTOR INSCITI/E MENSTRUUS A NEW GENUS AND TWO NEW SPECIES OF CHLOROPIDy^ (DIPTERA) By J. R. MALLOCH Eugaurax, new genus. Separable from Gaurax by the much shorter haired, pubescent arista ; the possession of two notopleural and four supraalar bristles, and a trans-verse row of strong, black, prescutellar bristles, 8-1 in number, on the mesonotum, as well as a series of about 8 strong marginal scutellar bristles. The scutellum is flattened and the posterior margin rounded in outline, with about 8 strong marginal bristles, the middle pair of which are strong-est. In other respects, ventation, etc., similar to Gaurax. From Botano-hia, Eugaurax may be distinguished by the chaetotaxy of the mesonotum. Type of genus Eugaurax floridensis, new species. Eugaurax floridensis, new species. Female ; Head yellow, opaque ; frons slightly over one-third the width of head at vertex, slightly wider anteriorly, entirely yellow except for the ocellar region, which is black ; ocellar triangle distinct, almost as wide as frons at vertex, and reaching midway to anterior margin ; entire surface of frons, except triangle, with short, scattered black hairs ; post-vertical bristles cruciate, outer vertical bristle strong, inner pair hair-like ; eyes pubescent ; antennae yellow, of moderate size, third joint rounded, browned on upper surface ; arista yellow, apical half brown, shortly pubescent, the base with an elongate thickening ; face and cheeks whitish yellow, the former wath a slight keel ; height of cheeks less than one-fourth that of eye ; eye one and one-half times as high as broad ; proboscis and palpi pale yellow, the latter of good size, bare. Mesonotum yellow, subshining ; disk with a broad, posteriorly quadridentate brown mark, the center portion of which, on the anterior margin, and the tips of the outer posterior prolongations are black ; there is also an indication of a black mark on the rounded portion behind the humerus on each side, and anterior to the suture ; the center two teeth of the disced marks are considerably shorter than the outer two ; disk covered with short, pale hairs, the bristles throughout black ; pleurae glossy yellow ; scutellum yellow, disk with very line, pale, scattered hairs; poftnotum glossy black. Abdomen yellow, with a black spot on the center of each segment forming a dorso-central line, and a triangular spot on anterior margin of each segment laterally, which gives indications of coalescing with the central spots, forming a series of tridentate transverse fasciae.