8YNARTHRUS. J35_ 



The species already known belong to Europe and to North 

 America. 



Table for the determination of the Species. 



, f Posterior margin of the pleurae yellow. 1 palmaris, nov. sp. 



I Posterior margin of the pleurae not yellow. 2 



2 I Hind femora yellow. 2 cinereiventris 'Lw. 



< Hind femora green. 3 barbatus Lw. 



Systematical arrangement of the Species. 

 I. Lower half of the occiput only with the usual cilia. 



1. palmaris, nov. sp. 2. cinereiventris Lw. 



II. Lower half of the occiput with a strong beard. 

 3. barbatus Lw. 



X 



Description of the Species. 

 I. LOWER HALF OF THE OCCIPUT ONLY WITH THE USUAL CILIA. 



1. S. palmaris, n. sp. and 9 Viridis, pleurarum margine pos- 



tico, coxis, pedibusque flavis. 

 ^ . Tarsis intermediis apicem versus dilatatis. 

 9 . Tarsis simplicibus. 



Green, the posterior margin of the pleurse, coxae and feet yellow. 

 . The middle tarsi towards their end enlarged. 

 9. Tarsi simple. Long. corp. 0.13. Long. al. 0.14. 



Male. It can be easily recognized by its striking resemblance 

 to the European Syntormon tarsatus Fall. Rather dark bronze- 

 green, little shining ; the abdomen usually rather copper-colored. 

 Antenna' black ; first joint on the upper side entirely bare ; the 

 second with a long thumb-like projection which overlaps the inner 

 side of the third ; third joint rather long, pointed, very bubes- 

 cent ; the arista has not precisely an apical but a somewhat sub- 

 apical position, as it is the case with Syntormon tarsatus. Face 

 covered with whitish dust, narrow. Palpi and proboscis black. 

 Front steel-blue. The delicate cilia on the inferior and lateral 

 orbits pale. Scutellum of the same color as the upper side of the 

 thorax, and beset, besides the usual bristles, with a few short hairs. 

 Pleurae grayish-green, their posterior margin yellowish. The 

 sides of the abdomen near its basis somewhat yellowish and trans- 

 parent ; on the posterior margin of its first segment there are long 



