SYMPYCNUS. 1ST 



Systematical arrangement of the Species, 

 I. The fourth, longitudinal vein ending before the tip of the wing. 



1. tertianus. 



II. The fourth longitudinal vein ending into the tip itself. 



2. frontalis Lw. 4. nodatus Lw. 



3. lineatus Lw. 



Description of the Species. 



I. THE FOURTH LONGITUDINAL VEIN ENDING BEFORE THE TIP OF 



THE WING. 



1. S. tertianus, nov. sp. and 9 Ex cinereo virescens, sub- 

 opacus, thorace non lineato, duobus primis antennarum articulis, pal- 

 pis, ventre, coxis pedibusque dilutissime flavicantibus, tarsis inde ab 

 articuli primi apice nigricantibus. 



. Articulo tarsoruna posticoruni tertio abbreviate et prope apicem pilis 

 paulo longioribus hirto. 



9 . Pedibus sirnplicibus. 



Gray-greenish, rather dull ; thorax without aark lines ; the first two joints 

 of the antennae, palpi, venter, coxae and feet pale-yellowish ; the tarsi 

 from the tip of the first joint blackish. 



. The third joint of the hind tarsi shortened and rough on account of 

 some longer hairs near the tip. Long. corp. 0.10. Long. al. 0.10. 



Dark grayish-green, rather dull. The front seems to be of the 

 same color. Face grayish. Palpi and the first two joints of the 

 antennae white-yellowish ; the third joint blackish, in both sexes 

 rather rounded. Arista in both sexes plain. Tenter whitish-yel- 

 low as far as its tip. The hypopygium, as in the other species of 

 this genus, rounded and semi-imbedded ; its lancet-shaped exterior 

 lamellae small, but distinctly perceptible and of rather dark color. 

 The posterior margin of the pleurae and the coxse white-yellowish ; 

 the four posterior coxae near the basis more or less infuscated. 

 Feet white-yellowish, with black, somewhat scattered hairs, on the 

 middle and the hind tibia? with a few black bristles. The tarsi 

 from the tip of the first joint very much infuscated, the hind tarsi 

 from the same spot almost entirely black. The joints of the fore 

 tarsi of decreasing length in the female, while in the male the 

 third and fourth joints are of about the same length. The joints 

 of the middle tarsi are of decreasing length in both sexes. The 

 first joint of the hind tarsi is, in both sexes, a little shorter than 



