New Genera and Species of Dolichopodida;. 



BY J. M. ALDRICH. 



Dactylomyia. 



New genus (Gr. daktulos, finger, toe; vuiia, fly). 



Face narrow, slightly wider above and below, a transverse suture 

 sets off the lower third from the upper portion. The antennae are 

 inserted high up, making the front exceedingly short. Antennae 

 small, very short, the three joints crowded together; third joint oval 

 with apical or subapical arista; first joint bare above. Occiput con- 

 vex, the cilia of the inferior orbit becoming scattered and irregular 

 near the mouth. Acrostichal bristles in two rows; a sub-quadrate, 

 slightly impressed spot before the scutellum, the latter with but two 

 bristles. Abdomen short, and strongly arched downward, only 

 partially metallic in color. Hypopygium large but short, bent for- 

 ward under the venter; it has no lamellae or projecting parts but is a 

 globose structure with a wide opening anteriorly. Fore cox«5 very 

 long. All the legs exceedingly long and slender, the tibi^ longer 

 than the femora, and the tarsi longer than the tibiae. Hind metatarsi 

 not shortened. Wings slender, not narrowed basally, the cross-vein 

 nearly in the center, oblique, distant twice its length from the margin 

 (on the fifth vein); the third and fourth veins gradually converge 

 beyond this point and end near together, the fourth decidedly before 

 the apex; just before the end they are nearly parallel. 



This genus has the longest legs of any in the family, that I have 

 ever seen. The hind leg is a trifle over twice the length of the whole 

 body, and the others scarcely less. The wing venation reminds of 

 Medeterus, and the habits are the same, both being found on the 

 bark of trees; but the legs, face, hypopygium, etc., are different. 



Dactylomyia gracilipes, n. sp. 



Male. Face long and narrow, slightly wider above and below, 

 silvery white pollinose. Palpi and proboscis yellow. Front covered 

 with grey pollen. Antennae yellow, tip of third joint slightly brown- 

 ish; arista subapical or very nearly apical. Cilia of inferior orbit 

 white. Dorsum of thorax green with thick brownish-grey dust; the 

 posterior impressed area bluish. Pieur.^ green with white dust. 

 Halteres and cilia of teguLx pale yellow. Posterior margin of the 

 pleurae pale yellow. Abdomen shining blue-green, the anterior edges 



(lol) KAN. UNIV. gUAK. VOL. VOL. IX. NO. 3, 1894. 



