L>34 



This species does not agree in venation with the previously 

 described species of Zygoneiira, but the pedicellate antenna! joints 

 of the male with their whorls of hairs are characteristic of that genus. 



Zygomyia interrupta, n. sp. 



Male. — Black, shining. Face yellowish brown ; base of antennae, 

 including the first 2-3 joints of the flagellum, yellowish; palpi yellow. 

 Thorax black, only the region of the anterior spiracle yellowish. 

 Abdomen black, the hypopygium yellowish. Legs, including the 

 coxae, yellow, apices of mid and hind coxae slightly blackened; fore 

 and mid femora slightly darkened at apices, hind femora blackened 

 on almost the entire apical third ; tarsi slightly browned. Wings 

 with a noticeable spot over the cross vein, and very faint indications 

 of a grayish preapical cloud on the region of the wing occupied in 

 ornata by the dark spot. Halteres pale yellow. Surface hairs on 

 body brownish yellow, the bristles black. 



Basal and third antennal joints subequal ; basal and second joints 

 with apical setulae. The upcurved prothoracic bristle on each side 

 very strong; scutellum shorter than in ornata, its breadth about equal 

 to twice its length ; four scutellar bristles present. Hypopygium with 

 two small, rounded, slightly projecting lobes, covered with short 

 hairs, the whole organ very inconspicuous. Legs bristled as in 

 ornata, the hind tibia with two rows of strong bristles, the postero- 

 dorsal surface with a series of short setulae ; mid tibia with two 

 ventral spines. Wing as in Plate XIV. Figure 29, the lower branch 

 of the media not reaching the margin of the wing. 



Length, 2.5 mm. 



Locality, Urbana, Illinois, November 13, 19 13, on window of 

 basement of Natural History Building, University of Illinois (J. R. 

 Malloch). 



This species may be separated from any other described species 

 in this genus by the incomplete lower branch of the media. This 

 character occurs in some of the species in the genus Cordyla, but the 

 structure of the antennae is quite different in the two genera. 



BIBIONID^ 



FoRBEsoMYiA, n. gen. 



This genus is distinguished by the following characters : Ocelli 

 present, forming an equilateral triangle ; eyes large, covering the entire 

 side of head; frons wide, converging above antennae; antennae short, 



