ALDRICH: NEW GENERA AND SPECIES OF DOLICHOPODID^. 153 



each being divided close to the base into two long filaments. The 

 dorsal (as above) one of these is somewhat more heavily fringed and 

 a trifle longer than the other, and bears near the base on the ventral 

 side a slight protuberance, surmounted by a tuft of hairs. 



Metapelastoneurus Kansensis, n. sp. 



Male. Palpi yellow, face silvery white, front violet bronze, cilia 

 of inferior orbit black. Antennae yellow, third joint brownish at tip; 

 arista with fine, sparse hairs. Dorsum of thorax shining green, with 

 bronze and somewhat violet reflections; a silver spot in the ante-alar 

 groove, below a bronze stripe. Pleurae silvery pollinose, over a green 

 ground-color. Cilia of tegulae dark, halteres yellow. Abdomen 

 shining green, the sutures bronze, and the sides somewhat white 

 pollinose. Hypopygium blackish, the slender filaments brownish, 

 fringed with delicate yellowish hairs, longer toward the tip. Legs 

 yellow, plain, the middle and hind coxk blackish except at tip; 

 middle and hind tarsi somewhat infuscated toward the tip. Wings 

 distinctly infuscated, venation the same as in the common Pclasto- 

 neurus vagans Loew. 



Length, 3.5 mm.; of wing, 2.6 mm. 



New Males, Western Kansas, (University of Kansas collection). 



TABLE OF SPECIES OF SYMPYCNUS. 



1. Fourth longitudinal vein ending before the tip of the 



wing, tertianus, Loew. 



Fourth longitudinal vein ending at the tip 2 



2. Antennae entirely black, fronlalis, Loew. 



Antennae pale at base 3 



3. Thorax with longitudinal lines lineatiis, Loew. 



Thorax without longitudinal lines 4 



4. Arista of male with a small lamella at tip nodatus, Loew. 



5. Arista of male plain occidentalis, n. sp. 



Ssrmpycnus occidentalis, n. sp. 



Male. Head rounded, the eyes contiguous or apparently so on 

 the face, palpi yellow, minute; antennae inserted very high up (as in 

 all the genus), making the face long and the front short. The front 

 is slightly excavated, covered with grey pollen. First joint of an- 

 tenna long and slender, brownish-yellow; second joint brown, short, 

 extending in a roundish projection along the inner side of the follow- 

 ing joint; third joint as long as the first, oblique in shape, the upper 

 and lower edges parallel, and the tip almost squarely truncate; on its 

 inner side the lobe of the second joint reaches nearly to the middle; the 



