28 Annals Entomological Society of America [Vol. VI, 



ventral sheath black; the hairs on the dorsum of the abdomen appear 

 reddish or yellowish when viewed from above, but more blackish when 

 seen from the side; hypopygium small, testaceous, rounded above, 

 with yellow hairs on the upper part, appendages partly yellowish. Legs 

 yellowish; front coxffi with delicate yellow hairs on the front surface 

 and yellow bristles near the tip, these bristles brownish in certain 

 lights; middle coxse with black hairs and bristles on the front side near 

 the tip, and some very minute yellow hairs above; hind coxas with the 

 usual black bristles on the outside, there is also a small bristle on 

 each middle and hind trochanter; front metatarsi one and one-fourth 

 times as long as their tibiae, the remaining four tarsal joints taken 

 together somewhat shorter than their tibiae, second and third joints 

 brownish; front tibise and tarsi with the hairs long, and with a row of 

 longer hair-like bristles on the lower surface of the tibiae and the first 

 three joints of the tarsi, these hairs nearly as long as the diameter of the 

 tarsal joints, there is also a row of shorter and stouter hairs on the 

 upper surface of these joints; middle metatarsi about as long as their 

 tibiffi, the remaining four joints together abount one-fifth shorter than 

 their tibiee; hind tarsi about as long as their tibicC, second joint a little 

 longer than the first; middle and hind tarsi brown from the tip of the 

 first joint. Wings hyaline, tinged with yellowish in front of the third 

 vein ; posterior cross-vein perpendicular to the fifth vein ; third vein bent 

 backward at tip, fourth vein quite sharply arched forward from a little 

 beyond the middle of its last section and ending rather close to the tip 

 of the third vein ; tip of the fourth vein distinctly before the apex of the 

 wing; posterior cross-vein about twice its length from the wing margin 

 measured on the fifth vein; veins brownish. 



Female: Differs from the male in having the bristles of the front 

 coxse black, these bristles are large and conspicuous; the front tarsi are 

 brownish and hardly twice as long as their tibice, the first joint hardly 

 as long as their tibite ; middle metatarsi a little shorter than their tibiae ; 

 second joint of hind tarsi only slightly longer than the first. 



Dr. Loew says in his description of this species that the 

 metanotum is black only on its base and along the center. I 

 have specimens before me which exactly agree with this, but 

 others have the metanotum almost entirely black, only a very 

 little yellowish at the sides. 



I have described the male of this species from two specimens : 

 one in the National Museum collection, taken by Mr. Burgess 

 at Beverly, Mass., September 6, 1874, and the other (a broken 

 specimen) taken at Sea Cliff, N. Y., by Mr. Nathan Banks. 

 The males seem to be rare, although the females are taken all 

 through the eastern states quite commonly; I have taken them 

 around Buffalo, N. Y., and have seen specimens from Con- 

 necticut, Massachusetts, New Jersey, Pennsylvania, Virginia, 

 and Kansas. Mrs. Slosson reports it from New Hampshire. 



