ORTALIDuE TET ANOPS. 121 



indistinct traces of three somewhat darker clouds are apparent; 

 the first in the marginal cell, above the origin of the subrnargiiiat- 

 cell, the second at the end of the stigma, and the third, which 

 sometimes is wanting, fills up the end of the marginal cell ; all 

 three are so little apparent that they can easily be overlooked. 

 Hab. Nebraska (Dr. Hayden). 



2. T. Integra n. sp. J . (Tab. VIII, f. 18.) Frons tola punctata ; alae 

 cinereae, imtnaculatse. 



The whole front is punctate ; wings gray, without any picture. Long, 

 corp. cuin terebra 0.280.31 ; long. al. 0.17. 



Head brownish-black, rather dusky brownish-red upon the 

 greater part of the front, the cheeks, and near the anterior edge 

 of the mouth. The front has no median stripe, and is altogether 

 covered with grayish-white pollen, rendered cribrose by numerous 

 small and very dense pollenless dots ; a fine network, covering 

 the whole front, is all that remains pollinose. The pollen 

 extends, from the front over the very broad lateral portions of 

 the face, as far as the cheeks; the pollenless dots, however, do 

 not reach beyond the middle of the face. The face in profile is 

 less projecting in front of the eyes, and less retreating below, than 

 in T. luridipennis. The antennal foveae, on their outside slope, 

 are covered, to a considerable extent, by a white pollen ; at the 

 bottom they are shining black. The flattened ridge of the 

 carina, separating them, has also a whitish pollen. The vertical 

 diameter of the eyes is larger than in the preceding species or 

 in any of the species of Tetanops to me known. The cheeks are 

 very broad, although somewhat narrower than in T. luridipennis. 

 The upper half of the occiput is clothed with a whitish pollen, 

 extending upon the hind side of the cheeks as far as the edge of 

 the mouth; in the vicinity of the posterior orbit and of the edge 

 of the mouth, this pollen is interrupted by pollenless punctiform 

 dots. Antennae brownish-red, the third joint for the most part 

 blackish-brown. The ground color of the thorax is glossy, almost 

 shining-black, but altogether covered by a whitish-gray or more 

 yellowish-gray pollen, interrupted by countless dots, which are, 

 however, much smaller and less sharply defined than in the pre- 

 ceding species. Quite in front, the thoracic dorsum shows an 

 indistinct beginning of a median stripe, in the shape of two dark 

 longitudinal lines, which are rather distant from each other. 



