338 A. L. MELANDER. 



IVIytliicoiuyia Rileyi Coquillett. 

 Ent. News, 1893, p. 209. 



Black, the frontal triangle, face, humeri, base of the first and apices of the other 

 abdominal segments, excepting the last, apex of femora, tibite wholly, and the 

 balteres white, the short sparse hairs also white; occiput, thorax and abdomen 

 gray pollinose. the hypopygium shining, one and oue-third times as high as long, 

 shorter than but projecting one-fourth its height above the eighth abdominal 

 segment. Wings wholly hyaline. 2.5 mm. 



California ; Mesilla Park, New Mexico (T. D. A. Cockerell). 



Iflytliicoinyia tibialis Coquillett. 

 Proc. Nat. Mus., 1895, p. 409. 



Male. — Black, frontal triangle, face, cheeks, humeri and each hind corner of 

 tlie thorax whitish ; halteres, except upper side of the knob, hypopygium largely, 

 knees and base of hind metatarsi yellowish. Head, sides of thorax, pleura and 

 scutellum gray pollinose, abdomen deep velvet black ; pile of head and body 

 whitish. Wings wholly hyaline, veins black, the auxiliary and bases of the 

 other veins yellowish. On the under side of the hind metatarsi, before its mid- 

 dle, is a rounded notch, in front of which is a rouud process. 3.5 mm. 



Los Angeles Co., Calif. (Coquillett). 



ADDITIONAL NOTES AND DESCRIPTIONS. 



During the time the foregoing pages have been going through the 

 press a number of additions have been made resulting from the 

 courtesies of several gentlemen. Through the kindness of Mr. 

 Samuel Henshaw the types of this family described by Dr. H. 

 Loew have been examined at Cambridge, which has introduced a 

 number of synonymical changes and brought to light several previ- 

 ously undescribed species. Charles W. Johnson, J. Chester Brad- 

 ley and George M. Greene have each contributed to our knowledge 

 of this family since the first collection was amassed. But the most 

 important of the following additions are the result of an expedition 

 to New Mexico during May and June of this year, undertaken by 

 James A. G. Rehn and Henry L. Viereck, under the direction of 

 the Philadelphia Academy of Natural Sciences. During one month's 

 time, Mr. Viereck collected twenty-three species of Empididse of 

 which only eleven were previously described. The twelve other 

 forms are included among the new species given in the main paper 

 or are described below. I wish to thank Miss Mabel Evans also for 

 her assistance in reading the proof of this article. 



