642 PROCEEDINGS OF THE ACADEMY OF [DeC, 



nervurs to upper end of the very oblique t.m., 640; first discoidal on 

 second discoidal, 704; first discoidal on third discoidal, 368; length 

 of t.m., 480; submedian cell on second part (beyond the interruption) 

 of lanceolate cell, 1,280; second discoidal on lanceolate (anal) cell, 

 768; lower side of second discoidal beyond lanceolate cell, 400. 

 Miocene shales of Florissant, Wilson Ranch (Wickham). 



Eriocampa Celata n. sp. (Tenthredinidae). 



Length 8 mm., abdomen 4, anterior wing 6 mm.; ferruginous, with 

 the head, posterior half of thorax and apex of abdomen apparently 

 black; legs ferruginous; anterior wings reddish hyaline, nervures 

 pallid; antennae ordinary, not clavate, width at about 1,600 microns 

 from base 208 microns; insect, as preserved, so like Cladius petrinus 

 that I assumed it to be the same until I examined the venation. The 

 venation appears to agree well with Eriocampa. In Rohwer's table 

 the insect does not agree with Eriocampa because the first r.n. is not 

 parallel with the b.n., the upper end of the r.n. being about 208 

 microns too far apicad; but nearly the same thing is true of E. ovata, 

 as figured by MacGillivray {Nortonella has the same feature, but is 

 otherwise quite different). Characteristic features of E. celata are 

 the oblique, gently arched cross-vein of marginal cell, which joins 

 the stigma 208 microns below the costa; the produced lower apical 

 corner of first s.m. ; the two sides of first discoidal cell (on basal and 

 recurrent nervures) nearly equal; the second s.m. receiving only 

 one r.n.; the very narrow (112 microns) top of first discoidal cell. 

 The lanceolate cell is contracted, but not closed; the cross-nervure, 

 which ought to be present, is obliterated, but I think I can see the 

 stump of the upper end (this, however, is not positive). 



The following measurements are in microns: first s.m. on marginal, 

 288 ; second s.m. on marginal (not allowing for curve) , 800 ; end of second 

 t.c. to lower end of marginal cross-vein, 608; lower end of marginal 

 cross-vein to upper end of third t.c, 368; first s.m. diagonally, 448; 

 first discoidal on first s.m., 480; first discoidal on second s.m., 416; 

 basal on first discoidal, 832; first discoidal on third, 800; lower end 

 of b.n. to upper end of t.m., 288 on one side, but 208 on opposite wing; 

 upper end of t.m. to lower end of first r.n., 512. Known from the 

 Florissant species of Eriocampa by the colors and the venation — • 

 e.g., from E. synthetica, pristina and wheeler i by the measurements 

 of the first discoidal cell ; from scudderi and bruesi by the compara- 

 tive measurements of the first two submarginals. 



Miocene shales of Florissant, Wilson Ranch {Wickham). 



