70 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



deeply jagged and bristly on apical margin, fringed with long hairs 

 on the edges. 



Coxae black with yellow tips; anterior pair with coarse black hair 

 on the front surface and strong bristles at tip. Femora black with 

 yellow tips; middle and hind pairs about as in grains Loew. Fore 

 and middle tibiae yellow. Hind tibiae black, only a little yellowish 

 at base, the yellow not extending over one-fourth their length on 

 upper edge. All tarsi as in gratus. Calypters and halteres yellow, 

 the former with black cilia. 



Wings like those of gratus (fig. 30), except that the veins are 

 blackish. 



Female. — Like the female of gratus, except that the hind tibiae 

 are only a little yellowish at base, the yellow not extending over one- 

 third their length on upper edge. 



Redescribed from the type specimen in the collection of J. M. 

 Aldrich; it was taken at Dover, New Jersey, June 18; 1 male taken 

 at Franconia, New Hampshire, by Mrs. Slosson; 1 pair taken at 

 Oolden, New York, July 30 and Aug. 23; 2 males from Boston, New 

 York, July 10; 1 female taken at East Aurora, New York, July 29; 

 1 male taken at Bond Lake, Ontario, July 16; and 3 males and 5 

 females taken at Kearney, Ontario, July 3. 



I have carefully compared the type and the other specimens with a 

 long series of gratus and can find no noticeable difference, except the 

 color of the hind tibiae, but there seems to be no grading in the color- 

 ing of the series of gratus and the series of calcaratus. 



No. 31. DOLICHOPUS MELANDERI, new species. 



Male. — -Length, 4 mm.; of wing, 3.5 mm. Face rather wide, sil- 

 very white. Front shining green, sometimes bronze brown. Anten- 

 nae black; first joint yellow below, usually conspicuously so; third 

 joint about as long as wide, somewhat orbicular in outline, but 

 pointed at tip. Lateral and inferior orbital cilia white, about seven 

 of the upper cilia on each side black. 



Thorax green with coppery reflections, sometimes mostly coppery, a 

 little dulled with gray pollen, especially along the front edge; pleurae 

 with white pollen. Abdomen green with coppery reflections on the 

 hind margins of the segments, and a little white pollen on its sides. 

 Hypopygium black; its lamellae moderately large (fig. 31a) some- 

 what quadrilateral in outline, but with the tip rounded, white with 

 a narrow black border on upper and apical margins which are a 

 little jagged and bristly. 



Coxae and femora black, extreme tips of coxae, trochanters and 

 extreme base and tips of femora yellow, the yellow sometimes more 

 extensive on the hind femora. Anterior coxae with white pollen 

 and little black hairs on their front surface. Middle and hind femora 



