106 Bulletin Wisconsin Natural History Society. [Vol. 7, Nos. 3-4. 



from other characters that there are many, and at least fully as 

 great, differences between these flies and the Dolichopodidse as 

 between them and the Borboridse ; nevertheless I feel, as when 

 concluding my original paper, that my negative conclusions are 

 more acceptable than any positive ones yet put forward in regard 

 to their relationships. 



Aphiochaeta smithii sp. nov. 

 Male. Length 1.2 mm. Black ; legs brownish, testaceous ; knob of 

 halteres whitish ; palpi clear yellow. Head rather flat, the front sub- 

 opaque or slightly pollinose ; about one-fourth broader than high ; me- 

 dian frontal groove and ocellar tubercle present. Anterior margin of 

 front with only two distinct median proclinate bristles. Lateral bristles 

 of lower row close to the lateral angle and very near to the anterior 

 margin of the front; following row above straight, its bristles equi- 

 distant, but the lateral ones very close to the eye. Ocellar row as 

 usual. Third antennal joint oval, slightly more elongate than usual, 

 with a long, almost entirely bare arista. Probiscis retracted. Palpi 

 of moderate size, with numerous, but rather small bristles ; conspicuous 

 by their contrasting clear yellow color. Mesonotum subshining, very 

 much more distinctly punctate than usual, thinly hairy. One pair of 

 dorsocentral bristles and only two marginal scutellar bristles ; meso- 

 pleura bare. Abdomen opaque, the segments gradually decreasing in 

 length, the second not elongated and without lateral tufts of bristles. 

 Entire abdomen with very sparse, short, bristly hairs. Wings hyaline, 

 the costal vein reaching distinctly beyond the middle of the wing; 

 first vein ending very close to the third, its tip being fully twice as far 

 from the humeral cross-vein as from the tip of the third ; tip of second 

 vein slightly but distinctly nearer to the tip of the third 

 than to the first. Costal cilia quite long and closely placed. 

 Fourth vein slightly and evenly curved ; fifth sinuate, sixth more 

 distinctly so; seventh distinct. Knob of halteres whitish. Legs 

 slender, brownish testaceous, the four posterior coxae and the hind 

 femora more or less infuscated. Tibiae destitute of distinct bristles 

 or setulae ; the hind ones with a raised line on the upper side extending 

 to the apical third where it divides to enclose a peculiar oval, flattened 

 or concave area which extends to the tip of the tibiae. Tarsi simple. 



Described from two specimens reared June 21 by Professor 

 John B. Smith from an agaric mushroom collected at Stelton, 

 N. J., which were sent to me by Dr. E. P. Felt for determination. 



