, DESCRIPTION OP THE SPECIES. 41 



blackish at the tip ; upon the hind side without glabrous stripe ; 

 fore tarsi but little longer than the tibiae, rather slender, blackened 

 from the tip of the first joint, still so that the extreme basis of the 

 second and sometimes even that of the third joint remain pale ; 

 the last joint of the fore tarsi is light rusty -brownish ; middle tarsi 

 from the tip of the first joint black ; hind tarsi entirely black. 

 Cilia of the tegulse pale yellowish. Wings hyaline, towards the 

 fore margin with a faint brownish-gray tinge ; the costa near the 

 tip of the first longitudinal vein only very little stouter, but not 

 thickened ; fourth longitudinal vein not broken. 



Hob. Illinois. (Le Baron.) 



Observation. In order to .distinguish D. socius from the very 

 like D. brevimanus, it is only necessary to pay attention to the 

 difference in the length and coloring of the fore tarsi and also to 

 the different nature of the hairs on the under side of the hind 

 femora. From D. subciliatus, nudus and splendidus, D. socius 

 differs by its hind tibias, which are distinctly blackish at the tip, 

 whereas in D. subciliatus and nudus they are only slightly infus- 

 cated at the tip, and altogether yellow as far as the extreme tip 

 in D. splendidus. From D. subciliatus and D. splendidus it 

 further differs by the red coloring of the lower margin of the first 

 joint of the antennas and by the hind femora of the which are 

 not ciliated ; from all three above named species it differs by the 

 plain fore tarsi of the . 



14. D. nudus, n. sp. and . Viridis, nitidus, coxis anticis pedi- 



busque flavis, apice tibiarum posticarum subfusco, antennis prseter in- . 



ferum articuli primi marginem tarsisque posticis nigris, ciliis oculorum 



inferioribus tegularumque ciliis flavicantibus. 

 . Tarsis anticis elongatis tenuibus, articulo ultimo dilatato atro, femori- 



bus posticis non ciliatis. 

 9 . Pedibus simplicibus, tarsis anticis inde ab articuli primi apice nigris. 



Green, bright ; fore coxae and feet yellow ; tip of the hind tibiae brownish ; 



hind tarsi black; lower margin of the first joint of the black antennae 



red ; cilia of the inferior orbit and of the tegulse yellowish. 

 . Fore tarsi elongated, slender, their enlarged last joint black ; hind 



femora not ciliated. 

 2 . Feet plain ; fore tarsi from the tip of the first joint blackened. Long. 



corp. 0.210.22. -Long. al. 0.25. 



Male. Metallic-green, bright. Front metallic-green. An- 

 tennae black ; the under side of the first joint yellowish-red ; third 



