JOUENAL OF ENTOMOLOGY AND ZOOLOGY 5 



DESCRIPTION OF THE IMMATURE STAGES 



Ula elegans Osten Sacken. 



Ula elegans Osten Sacken. Monographs of the DIptera of 

 North America, part IV, pp. 276, 277, 1869. 



Larva 

 (Plate I, Fig. 2) 



Length: Maximum, 8.5-11.9 mm.; diameter, 1.4-1.8 mm. 



Color of the larva dull white, the head-capsule very dark brown- 

 ish black, shiny. The caudal end of the body is produced into five 

 blunt teeth of which the dorsal one is median in position, two lateral 

 teeth slightly above the plane of the body, and two ventral teeth 

 directed laterad; the dorsal tooth is more blunt than the others. 

 The inner or caudal face of each tooth is adorned with a conspicu- 

 ous brownish black mark; the mark of the lateral tooth (see Plate 

 I, Fig. 3) is large, its outer end conforming with the shape of the 

 teeth, rounded at the tip, inner end concave, not touching the stig- 

 mata, separated from the stigma by a space about equal to the 

 light brown outer portion of the spiracle. Ventral teeth with the 

 black mark shaped as follows : Elongate, the dorsal outer face 

 gently convex, the inner ventral face gently convex on the terminal 

 portion, concave near the dorsal end; its dorsal or inner end is 

 separated from the spiracle of the same side by a distance a little 

 less than the diameter of the spiracle. Dorsal tooth with the mark 

 small, elongate-oval. A fringe of delicate blackish hairs around 

 the caudal end on the outside of the black marks and running inward 

 between the teeth; these hairs are longer and more prominent at 

 the ends of the teeth. Stigmata almost round, very widely separa- 

 ted from one another, the space between being about three times 

 the diameter of a single spiracle. Interstigmal disk pale with an 

 indistinct mark shaped as in the figure. 



Head-capsule rather oval. Antennae (see Plate I, Fig. 5) in- 

 serted on the sides of the front, just laterad of the caudal margin 

 of the clypeo-frontal sclerite; basal segment rather short, cylin- 

 drical, more widened at its base, the tip with two small conical lobes 

 that are almost transparent. Clypeo-frontal sclerite (see Plate I, 

 Fig. 7) broad at the base, the cephalic margin broadly rounded, 



