DESCRIPTION OF THE SPECIES. 59 



2. Fourth longitxidinal vein not broken. 



a. Antennae red, at the utmost the third joint at the tip or almost 



entirely black. 



a. Humeral callosities of the same color with the thorax. 



28. J>. hastatus, nov. sp. and f. Viridis, antenuis rufis, arti- 

 culo tertio ex parte nigro, ciliis oculorum inferioribus flavis, tegularum 

 ciliis nigris, pedibus flavis, tibiis intermediis maris ante apicern per- 

 spicue, foeminse obsoletissime albido-notatis, tarsis intermediis maris 

 apicem versus compressis, foeminae subconipressis, alarum vena longi- 

 tudinal! quarta non fracta. 



Green ; antennae red ; third joint partly black ; cilia of the inferior orbit 

 yellow, cilia of the tegulse black ', feet yellow ; middle tibiae before the 

 tip with a white spot, which is very distinct in the $, , and indistinct 

 in the 9 ; middle tarsi strongly flattened towards the tip in the , and 

 more slightly in the J ; fourth longitudinal vein not broken. Long, 

 corp. 0.22. Long. al. 0.220.23. 



This species, distinguished by many peculiar marks, resembles 

 in the structure of the arista D. Sagittarius Loew, from Sibe- 

 ria. Bronze-green, shining. Face of the < narrow and brassy- 

 yellow ; the face of the 9 is much broader, and has a grayish-yel- 

 low tinge. Palpi yellow, in the 9 towards the basis blackish. 

 Antennae reddish-yellow ; their third joint short and rather 

 rounded ; its apical half black or brown ; the arista of the 9 is 

 plain and rather stout ; that of the is longer and more slender, 

 enlarged at the tip into the shape of a lancet-like lamel pointed on 

 both sides, the tip of which has a dingy-whitish coloring. Front 

 shining bluish-green. Cilia of the inferior orbit yellow. Fore 

 coxae yellow, upon the anterior side with a delicate black pubes- 

 cence. Middle and hind coxae grayish-black, only the extreme 

 tip and the trochanter yellow. Feet yellow. Hind femora before 

 the tip with a bristle. Middle tibise with black tip, and before it, 

 in the J 1 , upon the upper side with a whitish spot, of which there 

 is hardly a trace in the 9 . Hind tibiae at the tip blackish-brown, 

 in the upon the hind side with a narrow, linear, hardly distinct 

 glabrous stripe. The tarsi have the tip of the first joint, the four 

 following joints, and besides, the base of the first joint of the mid- 

 dle tarsi, black ; the three last joints of the middle tarsi of the 

 are distinctly, although not very strongly, flattened ; this is also 

 the case in the 9 , but less perceptibly so ; this part of the 

 middle tarsi viewed from the side seems distinctly stouter than 



