ART. XXIX -THE FIRST DISCOVERED TRACES OF FOSSIL IN 

 SECTS IN THE AMERICAN TERTIARIES. 



By Samuel H. Scudder. 



Ten years bave elapsed since I published the first results of a small 

 collection of insects, found by Prof. William Denton in the Tertiary 

 beds of White Eiver.* With the possible exception of four insects, 

 described in 18G8 by Dr, Oswald Heer, from the Miocene of Xorth Green- 

 land,! they are the first insects found in the Tertiary strata of Amer- 

 ica. Since that time, many others have been found and a few described, 

 but they have not lessened the interest with which these should be re- 

 garded. In the earlier volumes of this publication, the Coleoptera and 

 Physopoda of Mr. Denton's collection have already been described,! and 

 in this place we offer descriptions of the remainder, all of which will be 

 fully illustrated in a general work on the fossil insects of the American 

 Tertiaries, to be published by the Survey. 



Some obscurity attaching to the precise locations at which the speci- 

 mens were obtained, it may be well to remark that, since the issue by this 

 Survey of the new drainage map of Colorado, it is possible to indicate 

 them with better accuracy. Both localities are on the Lower White 

 River; the lower, "Fossil Cauon", so near the mouth that, from the 

 plateau above the canon, one may see the valley of the Green River ; 

 this locality is, therefore, in Utah. The other locality, " Chagrin Valley", 

 is about GO miles farther up the river, and, therefore, is doubtless in 

 Colorado. The former is on the northern, the latter on the southern 

 side of the river. The larger part of the collection is from the upper 

 locality. . 



Concerning the collection as a whole, there is little to add to what I 

 have stated on former occasions. One or two corrections may, however, 

 be made. There are no Lepidoptera in the collection (nor have I yet 

 seen any from America), the supposed Xoctuid proving to be one of the 

 SyrpMdce, badly preserved, and the possible Slug-caterpillar, a Dipterous 

 larva; the " 2Iyrmica " proves to be one of the Forniicidcc. There are also 

 no Ortlioptera in the collection. A more careful study shows that a single 

 probable exception, Dicraiiomyia stiymosa, must be made to my former 

 statement, that the insects of one locality are completely distinct from 



' See Proc. Bost. Soc. Nat. Hist, x, .305-;{0G, xi, 117-18 ; Anier. \;it. i, .")(>, vi, 005-68 ; 

 Geol. Mag. t, 220--22.— Hollister, The Mines of Colorado, 378-:587. 

 f Flora Fossilis Arctica, 1-29-130. 

 t See Bulletin, vol. i, 2(1 series, 221-223, vol. ii, 77-87. 



711 

 1 BULL 



