Tribe TEREBR^L^TTIA Latreille. 



Family TENTHREDINIDvE Leach. 



TAXONUS Dahlbom. 



TAXONUS NORTONI. 



PI. 10, Figs. 26, 27. 



A fairly preserved specimen and its reverse, showing- a dorsal view 

 with most of a front wing, but neither legs nor antennae. The head find tho- 

 rax are dark, unusually dark for specimens on this stone, but the abdomen is 

 much lighter, almost uniformly so, but showing the sides a little duskier. The 

 veins of the wings and the stigma are uniformly dusky. The first discoidal 

 cell is almost uniformly rhombic, the cross-vein separating it from the sec- 

 ond discoidal cell being unusually long. The first inner apical nervure falls 

 exactly below the middle of the first discoidal cell and the lanceolate cell 

 has a strongly oblique cross nervure terminating opposite the inner end of 

 the same discoidal cell. 



Length of body, 7.5 m '" ; breadth of thorax, 2.5""" ; length of wing, 7 mm 

 Green River, Wyoming. One specimen, Nos. 22 and 140 (Prof. 

 L. A. Lee). 



Family CHALCIDID^E Walker. 



DECATOMA Spinola, 



DECATOMA ANTIQUA. 



Pi. 10, Figs. 20?, 31. 



Decatoma antiqua Soudd., Bull. U. S. OeoL.Geogr. Surv. Terr., IV, 749 (1878). 



On the same stone as Lystra richardsoni, but at a slightly higher level, 

 is a minute chalcid fly. The wings are lacking, but the whole of the body 

 is preserved, together with the antenna;. The head is large, arched, and 

 coi 



