AMERICAN DIPTERA. 367 



ing toward the middle line ; the usual bristles rather small ; ocellar prominence 

 defined by a very fine impressed line which continues down the front. Antennae 

 brownish black. Palpi brownish, with a few black bristles at the tip. Proboscis 

 small, yellow. Dorsum of thorax with one pair of dorsocentral maerochaetae and 

 two marginal scutellar bristles. Abdomen black, tapering in the female, with 

 the last segment slender and cylindrical. Halteres light yellow. Wings infus- 

 cated with brown, except toward the posterior border ; costal vein not reaching 

 quite to tbe middle of the wing, with short and delicate bristles; third vein fur- 

 cate. Light veins four in number; fourth vein nearly straight. Front legs 

 yellow at the coxae, gradually browner toward the tarsi, without any conspicuous 

 bristles; middle legs brown, with a long spur at the apex of each tibia. Hind 

 legs black, apex of each tibia with a single long spur; about seven short bristles 

 form a row down tbe back side of the apical half of the tibiae. 

 Length 1.2 mm., of wing 1.3 mm. 



Type locality, Brookings, South Dakota. Bred from a cocoon of 

 Chubex aviericana Leach, which emerged June 1st. 



Numerous specimens which agree well with the type. Nearly all, 

 however, are larger and darker, especially the palpi and legs, which 

 are often blackish. The wings are also quite strongly infuscated in 

 fully mature specimens. The palpi are rather broader at the tips 

 than usual. 



South Dakota (type, Aldrich) ; New Bedford, Mass. (Hough) ; 

 Boontovvn, N.J. (Greene); Hagerm an, Idaho (Aldrich); Ithaca, 

 N. Y, (Comstock) ; Monterey, Cal. (Wheeler), and Salinville, Ohio. 



This species is very readily recognized by its long and narrow 

 brownish wings and stout posterior tibiae, which are very strongly 

 setulose. 



Aphiochreta furtiva Aldrich. (Plate vii, fig. 39.) 

 Aldrich, Trans. Ent. Soc. Loudon, 1896, 436. 

 Female. Head, thorax and'abdomen black ; legs brownish, the tarsi and anterior 

 tibiae yellow. Front black ; the bristles rather below medium size, the fine hairs 

 somewhat conspicuous. Antennae blackish, more or less yellowish at base; palpi 

 yellow. Dorsum of thorax subshining, with one pair of dorsocentral macrochaetae 

 and two marginal scutellar bristles; pleurae shining black. Halteres black. 

 Femora in fully colored specimens dark brown, in less mature ones yellowish 

 brown, the tibiae lighter; hind tarsi almost twice the length of the tibiae. Hind 

 tibiae on the posterior edge delicately lined with black, on the inner side of this 

 with a row of about twelve setulae. Wings slightly yellow, the heavy veins 

 reaching well past the middle of the wing, first vein reaching barely more than 

 halfway from the humeral vein to the fork of the third, on thecosta; fourth 

 and fifth veins ending about equally far from the apex of the wing; seventh 

 vein almost obsolete. 

 Length 1.5 mm. 



This species comes nearest to the European eiliata Zett., from 



TRANS. AM. ENT. SOC, XXIX. NOVEMBER, 1903 



