NEW DIPTERA IN THE IT. S. NATIONAL MUSEUM. 



By D. W. COQUILLETT, 



Custodian, Section of Diptera. 



In the course of identifying- ttie New Jersey diptera for Dr. J. B. 

 Smith's excellent list of the insects of that State, ]Mr. C. W. Johnson, 

 curator of the Wagner Free Institute, of Philadelphia, encountered 

 quite a series of specimens belonging to obscure groups which he was 

 unable to identify within the limited time allowed him for this pur- 

 pose, and consequently submitted them to the writer for study. Mr. 

 Johnson permitted the retention for the U. S. National ]SIuseum collec- 

 tion of specimens pertaining to species not already represented therein, 

 the only conditions being that the data from the labels be sent him, 

 together with the names of the known forms and manuscript names of 

 such as were believed to be new to science. As these manuscript 

 names have now been published it is deemed advisable to publish 

 descriptions of these species and thus render permanent the names 

 which would otherwise have no value. i\.ccorcl 'ngly, these descriptions 

 are offered herewith, together with a number of those of other forms 

 encountered when identifying specimens for correspondents, or while 

 stud3'ing and comparing the Museum collection. These make a total 

 of 2 genera and 71 species. 



Family MYCETOPHILIDvE. 



BOLITOPHILA MONTANA, new species. 



Dark brown, the base of the third antennal joint, peduncle of the 

 halteres, coxte, femora and tibite light yellow, sides of mesonotum 

 largely brownish yellow, mesonotum polished; wings hyaline, stigma 

 elongate oval, gray; auxiliary vein reaches only slightly beyond middle, 

 between humeral cross vein and base of third vein, anterior branch 

 of third vein terminates in the costa, fourth vein at its base coalescing 

 for a short distance with the upper branch of the fifth near its base; 

 length, 4.5 mm. A female specimen, collected by Mrs. A. T. Slosson. 



Ilahltat. — Mount Washington, New Hampshire. 



Tyjye.—C^t. No. 5438, U.S.N.M. 



Proceedings U. S. National Museum, Vol. XXIll— No. 1225. 

 Proc. N. M. vol. xxiii 38 593 



