SYMPYCNUS. 191 



4. S. nodatllS LOEW. and 9 . Cinereus, margine prirni antenna- 

 ruin articuli infero, fascia abdominis basali, niaculisque lateralibus, ven- 

 tre et pedibus flavieautibus, femorum posticorum apice nigro, seta an- 

 tennali maris capituluni minutuni apicale gerente. 



Gray, the lower margin of the first joint of the antennae, a band near the 

 basis of the abdomen, lateral spots upon it, venter and feet, yellowish ; 

 the tip of the hind femora blackened ; the arista of the male at the tip 

 with a small button. Long. corp. 0.10 0.11. Long. al. 0.11 0.12. 



SYN. Sympycnus nodatus LOEW, Berl. Ent. Zeitsch. VI, 215, 68. 



Face of the male very narrow, upwards a little broader, with 

 white dust ; the face of the female much broader, not perceptibly 

 narrowed below, and much less thickly dusted, so that the black 

 ground-color is distinctly apparent. Antennas of a stouter struc- 

 ture, and even a little larger than in S. frontalis ; the first joint 

 rather long, upon the under side always of a yellowish color, some- 

 times yellow, with the only exception of its upper edge, in which 

 case the yellow coloring extends also on the lower edge of the 

 second joint ; the third joint in the male is broad ovate, in the 

 female rounded. Arista basal, in the female somewhat shorter 

 and plain, in the male longer and enlarged at the tip into a small 

 button. The front is gray, but appears in some directions almost 

 black. Upper side of the thorax brownish-gray, opaque, without 

 distinct longitudinal lines, with black bristles. Scutelluni usually 

 darker than the upper side of the thorax and without hairs, except 

 the usual bristles. Pleura? whitish slate-gray, their posterior 

 margin yellowish. Abdomen of a bronze-black, moderately 

 bright coloring, sometimes with a green or blue metallic lustre ; 

 upon the second segment there is a very broad, usually inter- 

 rupted, transverse baud ; upon the third segment there is also a 

 transverse band, usually interrupted in the middle, and consisting 

 of two yellow lateral spots ; the fourth segment has usually a yel- 

 low spot on each side. The hypopygiurn, being of the same color 

 as the abdomen, is of a similar structure as in S. frontalis ; its 

 small, not easily perceptible, appendages are black. Coxa? and 

 feet yellowish. The fore coxa? are covered only with whitish hair, 

 nevertheless the stronger hairs on the tip assume sometimes a 

 blackish appearance. The femora without any other bristles but 

 those small ones, usually found before the tip ; the hind femora are 

 of a brownish-black color to a rather large extent, though their 

 extreme tip is again paler. The fore tibias have only a single 



