DOLICIIOPUS. 57 



last joints of the tarsi are about as long as the second ; the two 

 last ones as long as the third. * 



Hab. Middle States. (Osten-Sacken.) Nebraska. (Dr. Hayden.) 

 Observation. The determination of this species, the most 

 common in the Middle States, is not doubtful when we compare 

 the descriptions of Say and Wiedemann, which serve to complete 

 each other. The 9 is easily distinguished from that of D. longi- 

 pennis by its less narrowed basis of the wings. Its distinction 

 from the as yet unknown 9 of D. vittatus must be very difficult, 

 unless perhaps the proportional length of their feet affords an avail- 

 able mark of distinction. Two males measuring only 0.23 in 

 length resemble in all plastic characters the of D. cuprinus so 

 much that I take them merely for a smaller variety . A single, un- 

 fortunately not well-preserved < , distinguished by a somewhat 

 larger size, may perhaps constitute a particular species, as the 

 fourth longitudinal vein is less broken, and the three last joints of 

 the fore tarsi are a little broader. It would not be safe, however, 

 to decide upon a single specimen. 



2T. D. lougipennis LOEW. and 9. Aeneo-viridis, thoracis line 

 media, vittisque lateralibus orichalceis plerumque subobsoletis, facie ex 

 flavo albida, antennis rufis, ciliis oculorum inferioribus albidis, tegularum 

 ciliis nigris, pedibus flavis, maris tarsorum anticorum apice dilatato et 

 alis basim versiis valde angustatis. 



Metallic green ; middle line and lateral stripes of the thorax of a brassy- 

 yellow color, however, mostly indistinct ; face yellowish-white ; anten- 

 nae red ; cilia of the inferior orbit whitish; cilia of the tegulse black; 

 feet yellow ; the tip of the fore'tarsi of the male enlarged and its wings 

 very much narrowed towards the basis. Long. corp. 0.2G. Long. al. 

 0.260.27; 



STN. Dolichopus longipennis LOEW, Neue Beitr. VIII, 21, 20. 



Bronze green, shining. Face white, often more or less yellow- 

 ish. Antennas red, the second half of the third joint sometimes 

 infuscated. Arista with a rather short but very distinct pubescence. 

 Front shining, green or blue. Cilia of the inferior orbit whitish- 

 yellow. Upper side of the thorax with a brass-colored middle line 

 and similar lateral stripes, which, however, are less distinct than 

 in the two previous species. Abdomen often very coppery, par- 

 ticularly upon its posterior half. Coxae and feet pale yellowish ; 

 fore coxe only on the inner margin of their anterior side with a 



