848 PROCEEDINGS OF THE NATIONAL MUSEUM. 



IxMU'iith; ulistcMiiiiy-, with irregularly located darker areas; posterior 

 iiuirgiii of \\w fourth plate sliohtly, broadly emarginate; terminal plate 

 conical, with a few scattered, (juite long, dark gray or brownish hairs; 

 tir-st ventral plate (behind its petiolar part) ferruginous. 



ir/;^^.s'.— Nearly hyaline, though varying much in this regard, the 

 outer margins more fuliginous than the rest; basal half of the fore 

 wing with a faint yellowish tinge; fore wing: second cubital cell much 

 higher than wide; first recurrent vein interstitial or nearly, with 

 the first transverse cubital; second recurrent vein joining the third 

 cubital cell a little beyond the second transverse cubital; hind wing: 

 transverse median vein almost straight, forming nearly a right angle 

 with both the median and anal veins; discoidal vein not nearly inter- 

 stitial; cubital vein absent beyond the transverse cubital; radial extend- 

 ing only a short distance beyond the latter; tegula? dull brown, almost 

 black, the anterior part slightly whitish sericeous. 



Legs. — Black, strongly whitish sericeous; coxa? coarsely punctured, 

 more sparsely on the hinder legs; with scattered, long, whitish hairs; 

 trochanters similar, but more sparsely punctured; femora still more 

 sparsely punctured or not at all; fore femora with a row of medium 

 long hairs on the inner face; ti])i» not punctured; fore tibiic with a 

 row of hairs on the inner face; hinder face of hind tibia? strongly 

 brownish sericeous; anterior metatarsus with six (sometimes seven) 

 long, stout coml> teeth alternating with very short ones; claws with 

 five black teeth, the inner one small; tips of the claws dull, dark 

 ferruginous. 



Male. — Differs as follows: Lateral ocelli very slightly nearer each 

 other than to the eyes; relative length of filament segments 4, I, A^ 

 TO, TO*, mandibles black, two toothed, not reaching across to the base 

 of the other one of the pair; sides of the thorax rather more coarsely 

 marked and more hairy than in the female; form of the abdomen 

 bluntly elliptical or oval, the hinder portion bent slightly under; the 

 surface above, wiiitish sericeous, particularly noticeaV)le on the darker 

 portions; first dorsal plate not rising very abruptly from the petiole; 

 fourth and fifth ventral abdominal plates silky black, sericeous, as is 

 the sixth, the hinder margin of which and of the seventh are broadly, 

 deeply excised, the margins bearing fine, short hairs. 



Length. — Females, 11-19 mm.; males, 1>-15 mm. 



This species was originally descril)ed from New Friburg, ])ut is 

 widely distril)uted in North America. The most northern localities 

 from which I have seen specimens arc Truro, Massachusetts; Milford, 

 Connecticut; Long Island, New York, and from Illinois, Wisconsin, 

 Montana, Idaho, and Washington. From these States it is (piite gen- 

 erally distributed southward, and I have seen examples from Florida, 

 Texas, New Mexico, Arizona, and California. It has also been reported 

 from Mexico, but I find no record of its capture in the West Indies, 



