38 CYRTIDAE OF NORTH AMERICA 



specimens of tristis in this region, as mentioned previously, and I 

 hoped to find a few more specimens. The best collecting ground 

 on the previous occasion was a little willow-covered sandy strip 

 not far from the edge of the river. Lupines were growing in these 

 open spaces where the big trees left off, and the specimens of 

 tristis had appeared to have a preference for these flowers. They 

 did not appear to feed on the flowers, but were flying around 

 them and resting on the leaves in the bright sunlight. Strangely 

 enough I took no specimens of tristis this time, but found sap- 

 phirinus quite common. Two pairs were taken in copulation 

 and several others were seen. A series of twenty-four was taken 

 on this trip, most of them not on lupines, but feeding in the little 

 bell-shaped blossoms of the twin flower, in spots of sunlight which 

 filtered through the forest canopy. In the sunlight they ap- 

 peared a bronze color and were more noticeable than tristis as 

 they flashed through the sunlit spaces. They were quite wary 

 when not engaged in feeding and were swift fliers. Only three 

 females were taken in this lot. 

 Eulonchus marginatus (PI. IV, fig. 17.) 

 Eulonchus marginatus O. S., Western Dipt., p. 277, (1S87). 



"Metallic green, with bluish reflections on the scutellum, the anterior margins 

 of the segments, etc.; venter metallic blue. Antennae l^lack. Thorax clothed 

 with dense pale yellowish white pile; abdomen with a short appressed pubes- 

 cence, which forms whitish cross-bands along the hind margins of the segments. 

 Legs black, and only the knees yellowish white. Tegulae with very distinct 

 black margins. Wings subhyaUne; aU the veins dark brown, except the distal 

 end of the costa and of the first posterior vein, which are reddish yellow. Pro- 

 boscis a little longer than the abdomen. Length, 9 mm. 



"Hab. Napa County, Cahfornia (H. Edwards). A single specimen, ap- 

 parently a male. The petiole of the second submarginal is subobsolete; as I 

 have only one specimen I cannot say whether this is a permanent character of 

 the species." 



There are two specimens in the National Museum collection, 

 and a typical one in the Kansas University collection, labelled 

 "Calif., Baron." (See flg. 17.) 



. Cyrtinae 

 Schiner, and several dipterists following him, have placed Ptero- 

 dontia in the Panopinae; Kertesz has done this in his "Catalogus 

 Dipterorum." I believe that the genus is more nearly related 

 to the forms in this subfamily. 



