272 ENTOMOLOGICAL NEWS. [June, ’08 
Incidental Studies of new species of Oscinis. 
By E. S. Tucker, 
Special Agent, Bureau of Entomology, U. S. Dept. of Agric. 
In my incidental studies of flies which were obtained by per- 
sonal collecting during past and more recent years, four forms 
have been found belonging in the genus Oscinis, which fail 
to agree with any known species, and, in consequence, they are 
named and described herewith as new. 
Oscinis nigra n. sp. 
Colorado,—Denver ; August, 1906. Type: one specimen de- 
posited in the U. S. National Museum. 
Wholly black, except fulvous tinge of halteres, and dull reddish 
eyes. Body and legs shining. Triangular space of front extending 
from the vertex to a point against the antennal insertions, lower 
angular edges of front dull opaque. Dorsum of thorax minutely punc- 
tured, bearing scattered black bristles, sides fringed; scutellum having 
two apical bristles of great length. 
First and second sections of wings equal in length, third section 
about two-thirds the length of either one of the preceding, and fourth 
section one-half the length. ‘Third and fourth longitudinal veins 
scarcely divergent. Length, 1.5 mm. 
This specimen differs from all previously described forms of - 
Oscinis on account of total absence of yellow or fulvous color, 
other than on the halteres. 
Oscinis flavescens n. sp. 
Colorado,—Manitou, 6629 ft.; August, 1894. Type: one speci- 
men deposited in the U. S. National Museum. 
Prevailing color yellow, with black markings as follows: A small 
spot on vertex enveloping the ocelli; three broad longitudinal stripes on 
mesonotum, the medial, except towards the distal end, is twice the 
width of a lateral one, beginning on the prothorax in advance of them 
and extending the entire length of mesonotum, while the lateral stripes 
taper to an end before reaching the posterior margin; metathorax 
polished black beneath the scutellum; dorsal base of abdomen and a 
median spot arising from anterior edge of second segment black, basal 
margin with a pronounced and rounded middle expansion on each 
succeeding segment also black; two subfuscous spots on pleura pos- 
teriorly beneath base of wing, and a strong dash of black on posterior 
coxal plate. 
Eyes black; vertex and front punctured, somewhat shining on 
triangular area; third antennal joint disciform, arista black; dorsum 
of thorax clothed with fine grayish pubescence which glistens on the 
