AMERICAN JDIPTERA. 349 



five fine setulse, on the hind tibise a similar series slightly longer are present on 

 the ouier side; middle tibise with two setse below the knee. Wings hyaline 

 with a yellowish tinge, at the ti|> slightly infuscated ; costal vein reaching a little 

 beyond the middle of the wing; fork of third vein slender, first vein reaching at 

 least three-fourths the distance from the humeral to the tip of the costal ; fourth 

 and fifth veins ending equally far from the apex of the wing, the former uni- 

 formly curved ; seventh vein extremely delicate. Costa with small, fine cilia. 

 Length 3-3.6 mm., of wing 2.5 mm. 



Besides the above, it may be noted thai there is only a single pair 

 of dorsocentral bristles and four equally strong marginal scutellar 

 bristles. 



One female specimen from Charles Harbor, Fla., collected by 

 Mrs. Slossoii and sent by Mr. Johnson ; two specimens, Tifton, Ga., 

 October Hi and 17 (Hough); one, Opelousas, La. (Hough). All 

 females. 



These ;ire somewhat lighter in color than Loew's type, still one of 

 these has a rather brown thorax. The only material disagreement 

 is in the pleurae " nigromaculatce" in his description and the middle 

 coxae (pale yellow in his, very distinctly brown in some of mine). 

 The type measured only 2.6 mm., but most of the species in this 

 family are extremely variable in size. 



This species, as well as divaricata and its variety perplexa, have 

 on the upper side of the hind tibia a fine, close series of appressed, 

 short hairs, forming a black line the length of the tibia, but this is 

 separate from what Loew alludes to as "in latero externo." 



I'hoia divaricata Aldrich. 

 Aldrich, Trans. London Ent. Soc, 1896, pt. 3, p. 437. 



Antennae, palpi, pleurae, halteres and legs deep yellow; front dark brown or 

 black, the. lower edge yellowish; thorax above varying from yellow to brown. 

 Abdomen black or brown, the posterior margin of each segment with a narrow 

 band of light yellow, which continues more or less as a stripe down the middle 

 of the dorsum ; venter yellow. Dorsum of thorax with one pair of dorsocentral 

 macrochaetae and only two strong marginal scutellar bristles. The other pair is 

 present, but very small and scarcely noticeable. Anterior tibise on the upper 

 side with a row of four setae ; middle tibiae with two setae below the knee, hind 

 tibiae with a minute row of fine hairs along the upper edge, but no setae except at 

 apex. Hind femora considerably thickened. Wings tinged with yellow 7 ; costal 

 vein reaching a little past the middle of the wing; first vein reaching three- 

 fourths of the way from humeral to tip of costal ; the fork of the third vein but 

 little visible, close to the main part ; male hypopygium very large and conspicu- 

 ous, bent tinder. 



Length 1.4-1.8 mm., of wing 1.5-2.4 mm. 



Before me are the types, two males and five females from St. Viu- 



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



