134 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.49. 



Hampshire, collected by Mrs. Slosson — these being the best preserved 

 show the thoracic stripes very plainly. 



There are several other specimens which I leave here provisionally. 

 One male, Monida, Montana (Cooley), is very robust, first antennal 

 joint greatly swollen, thoracic stripes unusually strong and black; 

 another male, Gallatin Valley, Montana (Harold Morrison), has the 

 tibiae distinctly yellow almost to the tip, thus approaching trivittata. 

 It will requke more material to explain all these differences. 



SYMPHOROMYIA PACHYCERAS Williston. 



Symphoromyia pachyceras Williston, Ti-ans. Amer. Ent. Soc, vol. 13, 18S6, p. 

 287, male and female. Northern California.— Bigot, Bull. Soc. Zool. France, 

 vol. 12, 1887, p. 15 (comata). California. 



Male. — Wholly black in color except narrowly on the Iniees, the 

 inner parts of the proboscis, and the stems of the halteres, which are 

 yellow, and the pulvilli, whitish. Opaque black pollinose on thorax 



except two cinereous lines on 

 dorsum; abdomen opaque 

 black; head a little cinereous. 

 Front as wide at narrowest 

 place as the anterior ocellus; 

 antennae black, first joint ci- 

 nereous, much thickened, wdth 

 dense and long black pile; 

 Figs. 6-7.-OUTER SIDE OF s. PACHYCERAS. 6, left.vn- second and third jomts very 



TENNA OF male; 7, RIGHT ANTENNA OF FEMALE. X20. mi i , p , t i 



small, tlie last oi the charac- 

 teristic kidney shape. Face with dense and long blackish pile on 

 the sides between the eye and the depression; palpi with dense and 

 very black pile; proboscis fleshy, short; cheeks, occiput and ocellar 

 triangle with long black pile. 



Thorax and scuteUum with long black pile above. Abdomen with 

 mostly pale pile on the first four segments, which are almost of equal 

 width, tapering but shghtly, the fourth with its sternite flat, its pro- 

 jecting edges rounded behind and provided with a row of stiff black 

 hairs; fifth segment much narrower and tapering; sixth minute; 

 seventh with dense black hair below; hypopygium subshining black. 



Legs rather shining black; middle coxae not with spines, but with 

 rather coarse black hair about tip; hind coxae with a shining black 

 tubercle on front side, small and hard to see. 



Wings strongly infuscated, slightly less so behind. 



Female. — Ground color as in male, stems of halteres paler. 

 Cinereous poUinose; the front, three broad stripes on mesonotum 

 not attaining the anterior margin, and most of the upper surface of 

 the abdomen black or brow^n poUmose. Pile of front dense, black, 

 long for a female; first antennal joint moderately enlarged, with 



