640 PROCEEDINGS OF THE ACADEMY OF [DeC, 



and second very near end (very much nearer end than in the living 

 0. tuherculiceps, 0. capra and 0. parietum); second r.n. at right angles 

 to lower side of third s.m. 



The following measurements are in microns: second s.m. on mar- 

 ginal cell, 64; third s.m. on marginal, 256; lower side of marginal 

 beyond third s.m., 384; lower side of third s.m., 384; end of first 

 r.n. to end of second, 176. 



Station 14, Miocene shales of Florissant {Wilmatte P. Cockerell). 

 Very easily known from other fossil (as well as living) species by the 

 remarkably short wings. It has also been examined by Mr. S. A. 

 Rohwer, who cannot find any reason for regarding it as a distinct 

 genus, notwithstanding its peculiar appearance. The anterior wings 

 reach only a little beyond end of second abdominal segment. The 

 wings, as preserved, are not longitudinally folded. 



Palseovespa wilsoni n. sp. (Vespidse). 



9 . Length about 15 mm., anterior wing about or hardly 9 mm., 

 first discoidal cell 4 mm.; robust, head and thorax black, abdomen 

 paler, probably yellow in life, as also the legs; wings clear, veins 

 nearly colorless (costo-apical region lost) ; first discoidal cell slightly 

 oblique at end; second recurrent nervure ending more than twice 

 as far from first as from end of second s.m. 



The following measurements are in microns: basal nervure on 

 first discoidal cell, 2,550; first discoidal on first submarginal cell, 

 1,760; first discoidal on second submarginal, 144; third discoidal on 

 second submarginal, 480; lower side of second s.m. beyond third 

 discoidal; 192; lower side of third discoidal 1,840; lower side of third 

 submarginal, 640; third discoidal on second discoidal, 512; outer 

 side of second discoidal below third discoidal, 288. 



Wilson Ranch, Miocene shales of Florissant {H. F. Wickham). 

 Named after the owner of the ranch where the fossils were collected, 

 who did everything in his power to aid the work. Nearest to P. 

 gillettei Ckll., but differing in the venation too much to be regarded 

 as a variation. 



^ndrena percontusa n. sp. (Andrenidae). 



9 . Length 12 mm., anterior wing about 8 mm.; head and thorax 

 black, abdomen pale; antennae ferruginous; wings clear, venation 

 ferruginous; basal nervure falling short of the very oblique trans- 

 versomedial; stigma large; first r.n. joining second s.m. near end. 



The following measurements are in microns : depth of stigma, 320 ; 

 first s.m. on basal nervure, 368; lower side of first s.m., 1,040; second 



