VOL. 68 TERTIARY INSECTS FROM SIBERIA COCKERELL 7 



Surface with stout bristlelike structures (bristle-scales), exactly as 

 in the living A. grandis Boheman. The apex is more acute than 

 in A. grandis, and the punctured striae are fewer, but the specimen 

 (a pair of elytra still joined) presents the dorsal view, and the lat- 

 eral striae are presumably not visible. 



Tertiary of Kudia Kiver, Siberia. 



Holotype.— Cat No. 69612, U.S.N.M. 



Family THROSCIDAE 



THROSCUS(?) PERITULUS, new species 



Plate 1, fig. 8 



Coffee-brown; prothorax 2 mm. wide and 1 mm. long, broadly 

 rounded, forming less than a semicircle, truncate but not excavated 

 in front, sides rapidly expanding posteriorly to end in a thin and 

 sharp spine or thornlike angle, mesad of which the hind margin is 

 broadly excavated ; surface of prothorax and elytra minutely rugose 

 or rugosopunctate; elytra slightly over 3 mm. long, and a little over 

 1 mm. Avide, width of insect at middle of elytra 2.1 mm. ; elytra 

 with humeral angles prominent; first three-fifths of outer margin 

 straight but the elytra slightly Avidening to the end of the straight 

 portion, then rapidly contracting to the obtuse apex; no striae or 

 distinct punctures, but some evidence of obtuse ridges, forming a 

 sort of narrow reversed V, in the manner of the Buprestid Anthaxia 

 aeneogaster Castelnau (specimen from near Ward, Colorado, com- 

 pared). The thorax is wholly different from that of Anthaxia. 



Tertiary of Kudia River, Siberia. 



Holotype.—Cdit. No. 69600, U.S.N.M. 



Had I only the elytra, I should imagine this to fall in the 

 Buprestidae, in or near Anthaxia. The thorax is more like that of 

 the Elateridae, except for its shortness. Thus the insect falls best 

 in the Throscidae, but the reference to llrtoscus is to be taken in the 

 broadest sense. As a possible alternative, I sought among the genera 

 of Nitidulidae, but found nothing closely comparable. 



Wickham described a Throscicl {Pactopus) from the Miocene of 

 Florissant; the specimen presents a ventral vievs', whereas ours 

 presents the dorsal. 



HYMENOPTERA 

 Family MEGACHILIDAE 



MEGACHILE AMAGUENSIS, new species 



Plate 1, fig. 1 



Anterior wing 9 mm. long and about 3.6 mm. broad; fuliginous, 

 with brown veins; marginal cell narrowl}^ rounded at apex, away 

 from costa; fold across first submarginal cell distinct; second sub- 



