90 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 68 



EUMACRONYCHIA NIGRICORNIS, new species 



Male. — Front at narrowest 0.24 of the head width (in the single 

 specimen examined the front appears somewhat crushed in and there- 

 fore may be narrower than normal) ; face and front yellow, overlaid 

 with silvery pollen; inner orbits most nearly approximated at base of 

 antennae, diverging moderately toward vertex; frontal vitta pale- 

 yellow, with sides slightly convergent to before middle, thence 

 moderately divergent to vertex, at level of lowest orbital one and one- 

 half times width of either parafrontal; nine bristles in frontal row 

 which extends downward as far as base of second antennal joint; one 

 reclinate and two proclinate orbital bristles present; parafrontals with 

 long, erect, black, bristly hairs continuous down over parafacials to 

 lower end of eye; vibrissae separated by a distance nearly twice the 

 length, and inserted one half the length, of the second antenna! joint 

 above front edge of oral margin; facial ridges with one or two small 

 bristly hairs above vibrissae; antennae with second joint red, third 

 joint black or at most with dense black tomentum over red, three 

 times length of second; arista thickened on basal three-fifths; in 

 profile, buccal width greatly exceeds that of the parafacials and 

 equals one-third the eye height, head length at vibrissae mucli less 

 than at base of antennae, front projects about one-half the horizontal 

 diameter of the eye; palpi pale yellow, slightly clavate. Thorax 

 gray pollinose, marked with three broad black vittae which are con- 

 tinuous to the scutellum; three postsutural dorsocentral bristles 

 present; scutellum with two jmirs of strong marginal bristles, a pair of 

 minute decussate apicals, and another pair of small preapicals. 

 Abdomen black, save the apex of the fourth segment, which is red; 

 basal two-thirds of last three segments gray pollinose with bronzed 

 reflections; apices of the intermediate segments and a broad median 

 dorsal vitta, polished black; first segment with a single lateral bristle; 

 second with one lateral and one strong median marginal pair; third 

 and fourth each with an uninterrupted marginal row of eight to ten 

 bristles; venter clothed with long erect villosity, the length of which 

 exceeds the diameter of the hind femur. Genital segments largo, pale 

 yellow, lacking macrochaetae; first segment bare, second clothed with 

 minute black, bristly hairs; inner forcei)s with black tips, in profile 

 straight nearly to apex, thence curved abruj)tly forward, claws not 

 divergent; outer forceps less massive and slightly shorter than the 

 inner pair, tapering rapidly to just before the black tips, thence 

 expanding in a small angular head, apposed to the tips of the inner 

 forceps; anterior claspers large, black, sickle-sha])ed; penis supported 

 by usual heavily chitinized rod terminating in a ring, from the center 

 of which arises a jiosteriorly directed, bottle-shajied, membranous 

 hood. Wings hyaline; fourth vein witli a right-angular bend; 

 section beyond the bend nearly parallel to the hind cross vein; costal 



