ART. 19 AMERICAN MUSCOID FLIES ALDRICH 9 



Not represented in the United States National Museum, although 

 we have several specimens rather close to it. The group appears 

 to be a difficult one, and the females probably differ from the males 

 in 3ome of the characters. Another male from the Vienna Museum, 

 labeled " Novara K. Brasilia," the same as the type, but not mentioned 

 by Schiner, is also labeled " breviponnis "; it has the same characters 

 except that the antennae are wholly yellow, the scutellum has a mix- 

 ture of pale and black hairs, the abdomen has an indistinct median 

 dark stripe, its third segment has two pairs of large marginals 

 (scars), the legs are decidedly yellow, and the middle tibia has two 

 bristles on outer front side. Another male, " Natt. Bras.," agrees with 

 the last, as do two more labeled simply " S. America." All of 

 these are labeled " brevipennis," but disagree with Schiner's descrip- 

 tion in having well-developed median marginals on the third segment, 

 so there is no doubt as to which specimen is the type. 



117. STOMATODEXIA COTHURNATA Wiedemann 



Stomoxys cothurnaia Wiedemann, Auss. Zweifl., vol. 2, 1830, p. 249. 



Stomatodexiu cothurnata Braueb and Bergenstamm, Zweifl. Kais. Mus.. pt. 4, 

 1889. Fig. 195 ; pt. 6, 1893, p. 133.— Van der Wulp, Biologia, Dipt., vol. 2, 

 1891, p. 239.— GiGLio-Tos, Mem. R. Acad. Sci. Toriuo, ser. 2, vol. 45, 1895, 

 p. 64. . 



Eight specimens, all males, were received, each of which is sep- 

 arately labeled cothurnata. Two of these are labeled type and two 

 more have old identifications. All of these four agree with the 

 description and may be considered the original type series. They 

 are from " Brasilien." The other four, although " det. B. B.," are 

 quite different and belong to two species. The species is the geno- 

 type of Stomatodexia. 



Male. — Front very narrow, only 0.09 of head w^idth at vertex, con- 

 tinuing in about the same width nearly to antennae; in profile the 

 front becomes a little prominent at the antennae, which are at a 

 level with the middle of the eye. Face in profile rather deeply 

 concave a little below the middle. Vibrissal axis equal to antennal ; 

 cheek about one-fifth the eye height; parafacial very narrow, 

 only one-third the width of third antennal joint. Ocellar bristles 

 proclinate, parallel, of the same size as the frontals; vertical bristles 

 hairlike. The whole head except the back is pale in ground color 

 with light yellow pollen, more whitish on face; epistoma brown. 

 Antennae pale yellow, the third joint slender, more than twice the 

 second. Arista with longer pluniosity than in most of the related 

 forms, the longest hairs being about equal to the wndth of the third 

 antennal joint. There are only two small black hairs below the 

 vibrissae; even these are absent in one specimen. Proboscis slender, 

 with minute erect setules, projecting forward from the epistoma 

 6642—29 2 



