2 PROCEEDINGS OF THE NATIONAL MUSEUM art. 5 



Siberian forests, but the AJnus corylina Knowlton and Cockerell 

 {corylifolia Lesquereux), which is one of the most abundant of the 

 fossils, and is represented by fruits and even what appears to be 

 the bank, is entirely similar in aspect to the alders {Alnus hirsuta) 

 grooving in dense thickets at the ver}- place where the fossils are 

 found. 



Kryshtofovich figures a Pinus, allied to the American P. pon- 

 derosa, with three leaves in the bundle. We found this abundantly, 

 and remarked that no such pine existed in the same region to-day. 

 However, we also found two other species of fossil pines, one with 



leaves in twos (like P. sylvestris) 

 and the other with bundles of four 

 slender leaves. This differentiation 

 of Pinus is suggestive of the 



Miocene. 



FIG. l.-PART OP VENATION OF J^ ^^ ^f ^ ^ ^^ f -J 



Phryganea lavrushini 



plants, too much importance should 

 not be attached to the specific determination. Thus one of the 

 species reported by Kryshtofovich is Glyptostrohus europaeus 

 (Brongniart.) Of this species Berry writes: 



This species is exceedingly common at a large number of localities and hori- 

 zons in the northern hemisphere throughout the Tertiary period. In North 

 America it is represented from the basal Eocene to the Pliocene, and though 

 it probably includes more than one botanic species no basis for its segrega- 

 tion except by geographic or geologic divisions is discernible. 



The insects, although more numerous in species than the recorded 

 plants, will not suffice to define the horizon, though on the whole I 

 should imagine them to be Upper Oligocene or Lower Miocene. 



TRICHOPTERA 

 Family PHRYGANEIDAE 



PHRYGANEA LAVRUSHINI, new species 



Pliite 2, fig. IG 



Anterior wing about 19 mm. long (the portion preserved 14.3 mm.) , 

 width fully 8 mm. ; mottled with brown on upper two-fifths, especi- 

 ally toward the base; a well-defined stigmatic cloud; discoidal cell 

 6.8 mm. long, its base very acute, a large cloud in and above its 

 apical end. Tertiary rocks of Kudia River, Amagu, Siberia, found 

 by my assistant, A. I. Lavrushin, 1923. 



H oUty pe.—C^t. No. 69593, U.S.N.M. 



This is a broad-winged species resembling P. latissima Ulmer, 

 from Baltic amber. The venation differs from P. latissima by Ro 

 leaving discoidal cell more basad, about 4.2 mm. from base of cell 

 and 2.5 mm. from separation of R,. ; separation of R3 to end of dis- 

 coidal cell only 0.5 mm. ; fork at separation of R, ver}^ narrow, much 



