IHI'TKKA SVIM'IIID.K. .Vi'.t 



half, and even lien- show no neiiration at all beyond the general course of 

 the principal veins at the very base; the alulae, however, are very distinct, 

 verv large, their breadth (along the wing) t'nllv equal to half the breadth 

 of the thorax, dark, with oblhpielv transverse dark ridges, indicating that 

 the\- were wrinkled in nature, much as in Volucella or CEstrilS. Abdomen 

 long, liroadest in the middle of the basal half, beyond tapering considerably, 

 the tip roundly pointed; apical half of basal joint black, forming a distinct 

 transverse straight band: the number of abdominal joints appears to be live. 



Length of thorax, 3.5"""; breadth of same, 3.25 mi " ; length of abdomen, 

 <;.f)""" ; wings, 12"""; breadth of same, 3.5 mm . 



I>r. \Villiston thinks it can not be an Eristalis. 



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



SYRPHUS Fabricitis. 

 SYRPHUS sp. 



Syrphus sp. Scudd., Ball U. S. Geol. Geogr. Surv. Terr., IV, 755 (1878). 



A species of this familv, and in size second only to the Milesia from the 

 same beds, is represented bv reverse and obverse of a single specimen. 

 whi -b is too imperfect for description, only the body being preserved; the 

 form and si/.e of this agree best with the genus Syrphus. 



The len-th of the bodv is 10 mm . 



d 



(treen River, Wyoming. One specimen, Nos. 4110 and -H ,":.' , S. II. 

 S. udder). 



CHILOSIA Meigen. 

 CHILOSIA AMPLA. 



IM. 0, Kitfs. 14, L'7. 

 rhnl.uia ,im/<i S.-inl.l., Bull. U. S. Gool. Gjogr. Snrv. Terr., IV, 7.V5-754 (1878). 



I'his species is primarily founded on a single specimen which Mr 

 I'niu diteh and I found in the shales at (injen River, and which preserves 

 nearlv all parts of the insect. There is also a specimen with its reverse 

 which we .ibtained at the >ame place, and another which Mr. K'ichanUon 

 sent me from the<e beds, agreeing with the first-mentioned specimen, but a 

 little larger. A> only the bodies are preserved, they are temporarily placed 



