DOLICHOPUS. 49 



very easy to confound. The characters by which they can be dis- 

 tinguished are as follows : 1. for D. batillifer 9 : The costa near 

 the tip of the first longitudinal vein with a slight trace of a swell- 

 ing, perceptible only to a very attentive observer ; this swelling is 

 rather elongated ; the apex of the wing somewhat broader than in 

 the 9 of the two other species ; the fore coxae beset with rather 

 coarse minute black hairs reaching almost to the base. 2. for D. 

 eudactylus ? : The costa near the tip of the first longitudinal 

 vein with a slight trace of a swelling, which' has only a very trifling 

 extent in length ; the apex of the wing somewhat narrower than 

 in D. batillifer, but somewhat broader than in D. tonsus ; the 

 fore coxse covered with rather coarse minute black hairs reaching 

 till very near the base. 3. for D. tonsus ? : The costa near the 

 tip of the first longitudinal vein without any trace of a swelling ; 

 the tip of the wing somewhat narrower than in the two other spe- 

 cies ; the black pubescence of the fore coxae more delicate and not 

 reaching as far towards the base as in the two latter species. 

 Whether the slight differences in the coloring of the tarsi, percepti- 

 ble in the specimens of these species compared by me, are sufficient 

 for their sure distinction, can only be decided by the examination 

 of a larger number of specimens. 



2. Antennae altogether or for the most part yellowish-red. 



20. I>. tener Loew. % . — Viridis, facie ex flavo albida, antennis rufis, 

 oeulorum ciliis inferioribus tegularumque ciliis albidis, pedibus pallide 

 flavis, ultimo tarsorum anticorum articulo maris modice dilatato, nigro. 



Green ; face yellowish-white ; antennae red ; cilia of the inferior orbit and 

 of the tegulse whitish ; feet pale yellow ; the enlarged last joint of the 

 fore tarsi of the male black. Long. corp. 0.15. Long. al. 0.17. 



Syx. Dolichopus tener Loew, Neue Beitr. VIII, 17, 13. 



Green, bright. Face yellowish-white. Antennae yellowish-red, 

 the apical margin of the third joint blackened ; arista with a very 

 short but still perceptible pubescence. Front metallic-green, 

 bright. Cilia of the inferior orbit whitish. Upper side of the 

 thorax not very bright. Lamellae of the hypopygium w T hite, 

 rounded, slightly bordered with black, on the apical margin some- 

 what jagged and fringed with black bristles. Coxae whitish-yellow, 

 the middle ones upon the outside partly gray ; the fore ones have, 

 besides the black bristles near their tip, only a very short and deli- 

 4 



