AKT. 19 AMERICAX MUSCOID FLIES ALDKICH 11 



118. STOMATODEXIA BIBENS Wied«mann 



Stamoxy-t bibois Wiedemann, Auss. Zweifl., vol. 2, 1830, p. 249. 

 StoniatodexM Mbenn Braueb and Bergenstamm, Zweifl. Kais. Mns., pt. 5, 1891, 

 p. 102 (gon. ref.). 



One female, " Brasilien, Coll. Winthem," with >iiiall. red tag of 

 AViedemann type and so labeled. Wiedemann's description deals 

 with some characters which are not well preserved noAV, but there 

 are no serious discrepancies and the specimen may be accepted as the 

 type. It is of robust build like Eit/myohia jlava Townsend (female 

 type), TrochiloJesMa flava Townsend (female paratype), and Stom- 

 atodexia slmiligena Van der Wulp (females determined by Bezzi). 

 The males of none of these are in the collection, but they are prob- 

 ably of more slender proportions. The location of the present species 

 in Stomatodexm is provisional, as it has a shorter and stouter pro- 

 boscis than that of cothunmta Wiedeman, type of the genus, and is 

 much unlike the slender males of that species in appearance. 



Female. — Vertex 0.26 of head width, widening considerably in a 

 short distance, the eyes then diverging gradually to their lower 

 curvature. Ocellar bristles represented only by a cluster of hairs, 

 Frontals extending to base of second antennal joint, the usual two 

 (>rl)ital.s present. Parafrontals and parafacials broad, the former 

 considerably wider than the middle stripe, the latter about twice as 

 wide as the tliird antennal joint. Cheek one-third of eye height. 

 Epistoma strongly projecting so that the face is deeply concave in 

 profile in its lower part. Vibrissae a little above the oral margin, 

 the vibrissal axis of the head equal to the antennal axis. Proboscis 

 from the elbow barelj^ equal to head height ; palpi about three-fifths 

 as long, slender, with a rather striking black hair below at tip and 

 several smaller toward the base. Antennae reddish-yellow, the third 

 joint rather distinctly infuscated from about the middle. Arista 

 with rather short plumosity. tlie longest hairs about two-thirds as 

 long as the width of the third antennal joint. Beard very pale yel- 

 low, only a single thin row^ of about six small black bristles along edge 

 of mouth. Pollen of parafrontals, parafacials, and posterior orbit 

 white with a slight tinge of yellow. 



Thorax yellow, except on the dorsum, which is considerably dam- 

 aged; humeri and sides of dorsum yellow, as well as the scutellum. 

 Sternopleural 2, 1; scutellum with tw'o lateral pairs and one discal 

 pair: no apicals. Calypters almost white, translucent. 



Abdomen reddish yellow, the first segment with a black spot under 

 the tip of the scutellum, the second segment wnth a large, poorly 

 defined, black triangle nearly reaching the front border, not quite 

 connected on the hind edge with a lateral mark which runs down on 

 the venter. Third segment damaged, but with considerably hirger 



