26 NATURAL HISTORY BULLETIN 



tibia, 1.75 mm.; of middle femur, 1.80 mm. Width of prothorax about 

 3.70 mm. 



Station number 13B. One specimen, received directly from Professor 

 Cockerell. The type is in the Museum of the University of Colorado. 



The specimen shows the underside, as far as the trunk is con- 

 cerned, but the elytron is twisted so as to exhibit the upper sur- 

 face. In the drawing, the punctures are a little too close together, 

 but answer the purpose intended, in showing the courses of the 

 stride. 



D. AURORA Wiclli. Station number 13. One paired specimen of a wing 

 cover in rather imperfect condition, was collected by Professor Cockerell. 

 A prothorax, with the front legs still attached, was taken at Station 17 by 

 Geo. N. Eohwer, and may represent the same species. 



Leptura Scrv. 



L. PETRORUM n. sp. (Plate VIII, Fig. 2.) Form rather elongate but the 

 outlines of the body are partly obscured by the spread wings. Head long, 

 muzzle produced, eyes not defined, sculpture obliterated. Antennae long and 

 slender, the apices wanting but in their completeness they must have 

 reached nearly to the elytral tips. Prothorax, in side view, strongly tap- 

 ering to the apex, arched above and below, the sculpture indistinct but 

 there is some evidence of irregular punctuation. Elytron very strongly 

 tapering to the tip, which is excavate a7id pointed on one side. Legs mod- 

 erately slender. Length from front of head to elytral apex, 11.85 mm.; 

 of elytron, 9.65 mm. Height of prothorax at base, 3.00 mm. 



Station number 14. One specimen collected by Mrs. W. P. Cockerell. 

 The type is in the Museum of the University of Colorado. 



The generic reference is to be understood in the broad sense, 

 since the recent genera of Leptur^e separate upon characters 

 which would only exceptionally be visible 'in fossils. The present 

 species is easily separable from L. ponderosissima by its different 

 build and from L. antecurrens by having much longer antenna 

 and sharp elytral tips. I have given the two names last men- 

 tioned to Florissant fossils belonging to the collection of the 

 United States National Museum, and while they will presumably 

 appear in print shortly they are as yet unpublished. 



DoNACiA Fabr. 



D. PRiM^VA n. sp. (Plate IV, Fig. 3.) Form rather slender. Head 

 wanting. Prothorax crushed and distorted, the visible sculpture consisting 

 of feathery or dendritic lines which I believe to be adventitious. Elytra 



