Dec, 1904,] Tabanidae. 231 



the antennae, otherwise the face including the cheeks, and the 

 front below to above the frontal callosity denuded and shining 

 black; above the frontal callosity and connected with it bv a 

 narrow interval is a nearly rectangular shining black spot, other- 

 wise the front is covered with dark gray pollen. No ocelli. The 

 third segment of the antenna appears slightly reddish caused it 

 seems by a covering of grayish pollen, slightly enlarged at base 

 but not with a distinct basal process, basal annulus as long or a 

 little longer than the other four taken together; second segment 

 small with a few black hairs at the anterior upper angle; first 

 segment of normal form above but strongly produced below 

 making it appear almost as though the second segment is at- 

 tached to its side, furnished above and below with short black 

 hairs; legs black ,all of the tibiae enlarged but not so much as in 

 Lepidoselaga lepidota, hind pair with a dense row of cilia on the 

 outer side. Wings black with the exception of apexes of the first 

 and second submarginal cells which are clear hyaline. The line 

 of union of this hyaline and the black forms a strong curve, and 

 at no point is the hyaline wider than the fourth of the total length 

 of the second submarginal cell. x'Vbdomen uniform blue-black 

 above and below. Length 13 millimeters. 



A female taken in Oak Creek Canyon, Arizona, in August, 

 1904, by Dr. F. H. Snow for whom the genus is named. 



The insect has afhnities with both the genera Selasoma and 

 Bolbodimyia but does not fall in either. It is an interesting 

 species and a splendid addition to the known North American 

 fauna. 



H.EMATOPOTA Meigen. 



A genus of nearly fifty species widely distributed in the 

 Eastern Hemisphere but represented by only two speices in the 

 Americas. The peculiarly enlarged first antennal segment and 

 the wide transverse front are characteristic. 



Haematopota americana Osten Sacken. The two known 

 American species are both found in the United States, but only 

 this one is western. It is larger than punctulata of the eastern 

 states, and in the specimens before me the third antennal seg- 

 ment, although somewhat compressed in both, is wider and 

 shorter in punctulata. Osten Sacken states that americana is 

 closely related to pluvialis of Europe and has published his results 

 of a comparison of the two. There are only a few specimens of 

 punctulata in collections so the opportunity for a careful com- 

 parison of our two species has not appeared. 



Tab.\xus Linne. 



Some authors have considered the species here included under 

 this one'genus^as belonging to three genera. The species with 



