NEW DIPTEEA OR TWO-WINGED FLIES IN THE UNITED 

 STATES NATIONAL MUSEUM 



By J. M. Aldrich 



Associate Curator, Division of Insects, United States Xational Museum 



The following descriptions of two new genera and 26 new species 

 of Diptera. with notes on little-known species and several tables of 

 species and genera, are the result of general work on the collection 

 in this order. 



Family MILICHIIDAE 



Genus PHOLEOMYIA Hendei 



Pholeomyia Bilimek, Verh. Zool.-Bot. Ges. Wien, p. 903, 1867. — Hen- 

 del, Wien. Ent. Zeit., vol. 30, p. 40, 1911. — Melander, Journ. N. Y., Ent. 

 Soc, vol. 21, pp. 234-238, 1913.— Malloch, Proc. U. S. Nat. Mus., vol. 

 46, pp. 130-134, 1913. 



Rhynchomilichia Hendel, Wien. Ent. Zeit., vol. 22, p. 250, 1903. 



PHOLEOMYIA EXPANSA. new speciea 



3Ia7e. — Dull black in color, the abdomen expanded and circular in 

 outline, silvery-white except on basal segment. 



Front brownish black, slightly converging toward the antennae, 

 where it is about one- fourth the width of the head. Besides the 

 orbital row of bristles, which extends slightly below the attach- 

 ment of the antennae, there are two variable rows of small bristles or 

 hairs beginning just below the lowest ocellus and converging so as to 

 unite at the lunule. Antennae black, the third joint round; arista 

 short ; vibrissae about the middle of the face, close to the eyes, sepa- 

 rated by tAvice the greatest diameter of the third antennal joint ; palpi 

 black ; proboscis not very long ; the labella folding back, as long as 

 the preceding segment. Thorax with well developed chaetotaxy: 

 dorsocentrals 4 ; acrostichals 3 or 4 pairs behind the suture, the hind- 

 most large; humeral 2; presutural 2; notopleural 2; supraalar 2; 

 intraalar 2 or 3 ; scutellum with 2 pairs ; mesopleura with a cluster 

 of about 8; sternopleura with 3. Halteres black including stem. 

 Calypters brown with blackish rim and brownish fringe. Abdomen 



No. 2555.— Proceedings U. S. National Museum, Vol. 66, Art. 18. 



9099— 25 1 1 



