DIPTERA— CHIRONOMIDJ5. 581 



middle tibi?e, O-O""" ; hind tibiae, 1.4"""; fore tarsi, 1.8"""; middle tarsi, 

 2.3°"" ; liind tarsi, 'i.l"™. 



Chagrin Valley, White River, Colorado. One specimen (W. Denton). 



Chironomus sp. 



Chiroiiomiis Bp. Sciidd., Bull. U. S. Geol. Geogr. Surv. Terr., IV, 749 (1878). 



A uiinnte specimen apparently of this family. Unfortunately it has 

 no wings, and little can be said of it more than to record its occurrence ; it 

 is 3°"" long, has large eyes, a stout thorax, and altogether resembles a Chi- 

 ronomus ; it is however distinct from any found in the White River .shales. 



Green River, Wyoming. One specimen. No. 141 (F. C. A Richardson). 



Chironomid^ sp. 

 PI. 5, Figs. 32, 33. 



An indeterminate species of this famil)^, whose generic affinities can not 

 be discovered from the entire absence of neuration in the wings and the 

 loss of every other characteristic feature, presents a side view of the body 

 with fragments of legs. The insect is minute, measuring but 2.75"°' long. 

 It may possibly belong to the Cecidomyidse. 



Chagrin Valley, White River, Colorado (W. Denton) . 



Chironomid^ sp. 

 PI. 5, Fig. 24. 



Another similar specimen, but distinct from the above, exhibits a dor- 

 sal aspect, and little besides the trunk is left. The thorax is comparatively 

 stout, the head nearly as broad as the thorax, and the abdomen very slender 

 and equal. The body is 3.25"'"' long. 



Chagrin Valley, White River, Colorado (W. Denton). 



Chironomid^ sp. 



A third indeterminate species probably belongs to this group, but the 

 specimen is too indistinct to be of much value. It is a female. The an- 

 tennae are a little longer than the head, the head a little narrower than the 

 abdomen, the latter tapering to a point. The costa of one wing is present 

 and the rather short and moderately stout legs of the opposite side. 



Length of body, 1.8"""; of middle fen)ur 0.8"""; of same tibia% 0.5'""'. 



Fossil Canon, White River, Utah (W. Denton). 



