AMERICAN DIPTEKA. 369 



segments darker. Ocellar triangle defined by a suture which extends down the 

 front; anterior frontal bristles proclinate. Dorsum of thorax dull, thickly pu- 

 bescent, with one pair of dorsocentral macrochaeta? and two marginal scutellar 

 bristles. Costal vein less than half the length of the wing; first vein joining 

 the costa near its apical third; third vein forked; costa fringed with strong 

 bristles; fourth vein nearly straight. Fore tibia? unarmed, middle and posterior 

 ones fringed with stout spines posteriorly, each with a large apical spine. Tarsi 

 about one-fourth longer than the tibiae. — (Condensed and elaborated from original 

 description.) 



Length 1.92 mm., of wing 2.4 mm. 



I have seen two females of the original type lot, which were very 

 kindly loaned to me by Mr. C. W. Johnson. This species comes 

 very close to the European rujipes Meig., but the females differ 

 from those of rujipes in having the fourth vein evenly curved for 

 its entire length. The costa is also a trifle shorter, not quite reach- 

 ing to the middle of the wing, and the first vein ends nearer to the 

 tip of the third. 



Type locality, New Brunswick, N. J. 



I cannot find the stout spines mentioned in the description of the 

 posterior tibiae. In the two specimens which I have seen the tibiae 

 show only a faint suggestion of ciliation. 



Aphiochsela agarici Lintner. (Plate vii, fig. 41.) 

 Lintner, Tenth N. Y. Eeport, p. 399. 

 Aldrich (P. setucea female, nee male), Canad. Ent., xxiv, 141, figs. 



Male and female. Black, antennae fuscous; knob of halteres yellowish white, 

 front and middle legs yellowish brown, tarsi brownish, hind legs darker; palpi 

 yellowish. Wings hyaline. 



Ocellar triangle defined by a suture which extends down the front; anterior 

 frontal bristles proclinate. Dorsum of thorax thickly pubescent, with one pair 

 of dorsocentral macrochaeta? and two marginal scutellar bristles. Costal vein not 

 reaching to the middle of the wing. Apex of the first vein nearer to the tip of 

 the second vein than to the humeral cross-vein ; third vein forked ; costal vein 

 fringed with strong seta-; fourth vein curved both at the base and apex. Front 

 tibiae unarmed, middle tibiae with a very long posterior apical spine; hind tibiae 

 with one long anterior and several short apical internal spines. Anterior edge 

 of middle and posterior edge of hind tibia? fringed with a thick row of stout 

 setulae ; internally and closer to the hind margin of the hind tibiae there is a row 

 of about nine stouter spines on the apical three-fourths. Hypopygium of male 

 with an irregular dorsolateral plate, the ventral portion of which is prolonged. 

 Two pairs of organs extend from the plate, an upper straight pair bearing numer- 

 ous long setae along the entire surface, and a lower pair, slightly curved ventrally 

 and hearing several long, usually sharply curved seta? at their tips. 



Length 1.5-2 mm., of wing 1.75-2.25 mm. 



Closely related to P. setacea, but in this species the anterior row 

 of frontal bristles form a nearly straight transverse row, while in 



TEANS. AM. ENT. SOC. XXIX. (47) DECEMBER. 1903. 



