AMERICAN DIPTERA. 363 



Length 2 mm. Wholly yellow; dorsum of thorax very slightly shining, with 

 only two scutellar and one pair of dorsocentral maorochsetse. Front yellow or 

 somewhat gray pollinose. Antennae bright yellow, ns arc also tin- palpi ; anten- 

 na! arista pubescent; two strong macrochsetse just below the eye Abdomen 

 usually dull yellow; dorsum often infuscated or yellow, witli lateral black spots 

 on the third and fourth segments. Legs bright yellow, darker on the tips of the 

 femora. Hind tibiae with a black line above and a row of delicate setulae. Wings 

 yellowish; veins of the same color. Costal vein reaching to the middle of the 

 wing, its bristles rather long; first and second longitudinal veins slightly more 

 approximated than in tinr<i Fall. 



There tire numerous specimens from Opelousas, La. (Hough), and 

 Wisconsin (Wheeler), which agree well with European specimens 

 of this species. The abdomen varies considerably in color, but 

 otherwise I can detect no differences. 



1 |>hi<M'li:cf a fungicola Coq. (Plate vii, fig. 32.) 

 Coquillett, Canadian Entomologist, xxvii, 106 (1895). 



Black, subshining, dorsum often brown, antennae and halteres concolorous; 

 the palpi and the. legs, including front coxae, yellowish. Dorsum with one pair 

 of dorsocentral macrochaMae and two marginal scutellar bristles. Tibia? destitute 

 of stout setae on the outer side, hind ones microscopically setnlate ; costal vein not 

 quite extending to the middle of the wing, ciliate with short bristles. Third vein 

 forked near the apex ; tip of first vein just beyond the middle of the distance 

 between the humeral cross-vein and tip of the third vein ; fonrth vein gently 

 curved for its whole length, the cell in front of it scarcely wider than the nar- 

 rowest part of the one behind it. Abdomen hare in both sexes. 



Length 1-1.5 mm. 



Type locality, Las Cruces, New Mexico (Cockerell). 



Bred from larvae infesting a tree fungus (Trametes peekii), which 

 was inhabited by coleopterous insects belonging to the genus Cis. 



I have examined three female specimens, from the original type 

 lot, very kindly loaned by the U. S. National Museum. The hind 

 femora are quite broad, darkened at the tips and fringed below on 

 basal half with curved black hairs. 



I have a number of specimens from New Bedford, Mass. (Hough), 

 and Ithaca, N. Y. (Comstock), which come very close to this species. 

 They differ by their light-colored halteres. These I have designated 

 as fungicola var. in the table of species. 



Aphiocliaeta nigriceps Loew. (Plate vii, fig. 34.) 

 1866. Phora nigriceps, Loew., Centuries, vii, 99. 



1879. Phora aletiae, Comstock (teste Coquillett), Kept. U. S. Dept. of Agri- 

 culture, pp. 208-211. 

 1892. Phora nigriceps, Aldrich, Canad. Ent., xxiv. 

 1895. Phora nigriceps, Coquillett, Canad. Ent., xxvii, 103. 



TBANS. AM. ENT. SOC XXIX. NOVEMBER. 1903. 



