330 



Structurally as the male of varicgata, but the veins enclosing the 

 discal cell are much more distinct. 

 Length, 4.5 mm. 



Type locality, Lafayette, Indiana, June 23 (J. M. Aldrich). 

 Named in honor of the collector. 



OXYCERA AI^BOVITTATA, n. Sp. 



Female. — Black, shining, with conspicuous whitish markings. 

 Head black ; f rons with a white line on each side from anterior 

 ocellus to antennae, touching the eye-margin on the lower third and 

 separated from it on the upper two thirds by a space subequal to its 

 own width, not incurved above, connected with the white, pilose lateral 

 face-stripe at base of antennae, the latter not abruptly narrowed be- 

 low, gradually tapering; face with the exception of the lateral lines 

 black; posterior orbits white, except a portion along eye-margins on 

 upper half, separated from the white spot on vertex by a narrow black 

 line ; mouth parts whitish yellow ; antennae reddish, basal two joints 

 whitish, apical joint brown. Thorax with the same pale markings as 

 variegata ; base of scutellum and basal angles black. Abdomen with 

 the following creamy white markings : a transverse spot at base, pro- 

 duced caudad in center, a moderately large oblong spot on center of 

 third segment which is rounded posteriorly, the entire apical half of 

 fifth segment, and a spot on lateral margins of second, third, and 

 fourth segments, all of the marginal spots connected by means of the 

 narrow marginal whitish line, the spot on each side of third segment 

 larger than the others ; venter black, marginal spots showing slightly. 

 Coxae black, legs flavous. Wings clear, veins yellow. Knob of 

 halteres white, stem brownish. Hairs on body whitish. 



Frons slightly broader than eye-width, slightly raised on each side 

 of the median line, this line and the lateral edges slightly impressed; 

 antennae rather elongate, arista not longer than the composite third 

 segment (3-6) ; posterior orbits rather broad. Thorax distinctly 

 jjunctured, discal hairs rather short. Abdomen and legs of normal 

 form. Vein closing apex of discal cell in vertical line with apex of 

 stigma ; the portion of costa from apex of stigma to fork of third 

 vein distinctly longer than that from fork of third vein to apex of 

 third. 



Length, 5 mm. 



Type locality, Muncie. Illinois, July 5, 1914 (J. R. Malloch). 



