92 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 68 



tinctly clavate. Thorax densely gr&j pollinose, with two obscure 

 vittae; scutellum with two pairs of strong marginal bristles, apical 

 pair lacking. Abdomen black; segments shining on apices; basal 

 halves of last three with broad white pollinose bands sharply defined 

 from the black and not extending over the venter, first abdominal 

 segment with one lateral and one weak median marginal pair ol 

 bristles, second with one lateral and one strong median marginal pair, 

 the last two with marginal rows of about eight, the marginal bristles 

 of the third as strong as those ol the fourth segment. Genitalia 

 large, black, in repose prominently extruding from tip of abdomen, 

 exposed for distance about two-thirds the length of the fourth 

 abdominal segment; second genital segment distinctly longer than 

 first. Wings hyaline; posterior cross vein parallel with the nearly 

 straight section of the fourth vein beyond the bend; last section of 

 fifth vein equals one-third the preceding section; costa with a small 

 spine; third vein with a row of small bristles reaching more than half 

 way to small cross vein. Legs black; pul villi of fore feet nearly 

 one and one-half times length of last tarsal joint; one small bristle 

 on outer front side of middle tibia near its middle; hind tibia with two 

 une(pial bristles on outside surface before the middle. 



Female. — Not known. 



Length, 3.0 to 5.0 mm. 



Host relationship. — Unknown. 



Redescribed from the type, which is a male from Las Cruces, New 

 Mexico, August 7, and another male from the same locality, Sep- 

 tember 17, which is Coquillett's type for Senotainia fasciata, both in 

 the National Museum. 



EUMACRONYCfflA ROHWERI, new species 



Male. — Front in the single specimen measured 0.31 of the head 

 width; frontal vitta yellow, with parallel sides on anterior half, 

 moderately divergent posteriorly, at level of lowest orbitals slightly 

 more than twice as wide as the parafrontal; vertex gray pollinose; 

 parafrontals, whole of face and bucca white pollinose; seven to nine 

 bristles in the frontal row; one reclinate and two proclinate orbital 

 bristles; a few black bristly hairs on the parafrontals outside the 

 frontal rows; vibrissae less than one-half length of second antennal 

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

 small bristly hairs just above vibrissae; antennae extend four-fifths 

 distance to vibrissae, second joint brown, third joint black with its 

 length two and one-half times the second and the outer apical angle 

 bluntly pointed; arista thickened on basal two-fifths: ])arafacials 

 sparsely covered with black bristly hairs; in profile, buccal width 

 nearly equals one-third eye height; proboscis distinctly shorter than 

 height of head; palpi clavate, black. Thorax gray pollinose, merging 



