20 NATURAL HISTORY BULLETIN 



that one side is about straight while the other is arcuate. Elytra broken- 

 at tip but showing a good part of their surface which is strongly sculp- 

 tured with moderately large subconfluent punctures tending to form trans- 

 verse rugae. Abdomen with six visible segments, nearly smooth, sternal 

 thoracic pieces finely and sparsely punctured, a little more coarsely and 

 closely on the prothoraeic flanks. Length, 3.50 mm. 



Station number 14. One specimen, collected by S. A. Rohwer. The type 

 is in the American Museum of Natural History. 



There seems to be no reason for doubt as to the family affinities 

 of this beetle, but students of the Malachidffi will know the diffi- 

 culty of closer classification in the absence of all appendages. 



Trichochrous Mot sell. 



T. MioCENUS n. sp. (Plate Y, Fig. 5.) Form rather elongate. Head 

 and prothorax much distorted and with the sculpture obliterated. Elytra 

 covered somewhat sparsely with slender short hairs and with well defined 

 regular series of longer stouter hairs, which, in their prostrate fossil con- 

 dition, give the appearance of striation, as shown in the figure. Length,, 

 5.00 mm. Width, 2.65 mm. 



Station number 17. One specimen, collected by Mrs. \Y. P. Cockerell. 

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



The vestiture of this beetle is arranged about as in the recent 

 T. seriellus, common in Wyoming and Utah. 



Protapate n. gen. 



Related to Apatides Casey, but differs in the eyes being relatively much 

 larger when viewed from above, the intervening separating space being only 

 about equal to the transverse ocular diameter. Prothorax apparently with- 

 out recurved hooked processes and differently sculptured, as will be seen 

 from the following description of the tyx>ical and only known species. 



P. CONTORTA n. sp. (Plate II, Fig. 15.) Preserved in dorsal view, the 

 elytra somewhat twisted and partially overlapping, the prothorax also 

 distorted. The specimen is a reverse, but I describe the markings as shown 

 thereon, adding the interpretation at the close of the diagnosis. Head 

 transversely quadrate, eyes transversely elliptical, relatively large, sepai-- 

 ated by about one long diameter. Front finely granulate, vertex finely 

 longitudinally rugose for its entire width. Prothorax distorted, but longer 

 than high (or broad, it is not possible to tell from the condition of the 

 specimen whether we see the entire disk, but I believe it is in part profile), 

 closely, strongly, and rather regularly granulate, the granules rounded, 

 replaced on an area occupying the anterior dorsal portion by a considerable 

 group of deep, large punctures disposed in about five diagonal series. 



