32 NATURAL HISTORY BULLETIN 



fine, sharp, scarcely visibly punctate striae, the punctures longitudinal. 

 Middle coxas closely approximate, hind coxae more widely separated, inter- 

 coxal process triangular. ^Middle femur rather slender, hind femora strongly 

 swollen but not visibly toothed, their tibia? arcuate and earinate. Length, 

 4.65 mm. 



Represented by three specimens, one paired and considered as the type 

 from Station number 14, collected by Geo. N. Rohwer; one dorsal view 

 (single) from Station number 17, collected by Mrs. Coekerell; and one 

 single (side view) from the same source. The description and all the fig- 

 ures are made from the type, which is in the Museum of the University of 

 Colorado. 



It is easily distinguished from all of the other Florissant spe- 

 cies of Bruchus, except B, oshorni, by the sjender antenna? and 

 fine sculpture, and from that insect by the truncate thoracic 

 apex, stronger punctuation and more pronounced basal lobe. 



The species is named after the late Roland Hayward of Milton, 

 Massachusetts. 



B. OSBORNI n. sp. (Plate YII, Fig. 9.) Form moderately elongate. 

 Head not visible, covered by the thorax. Antennae long and slender, the 

 joints beyond the second much longer than broad. Prothorax rounded at 

 base and apex but without a strong basal lobe, surface with extremely fine 

 and widely spaced punctures, which, however, are fairly deep. Scutellum 

 rather large for this genus. Elytra about two and one-half times as long 

 as the prothorax, finely, sharply striate, the strial punctures scarcely visible 

 except at the base where they are very fine, slightly elongate and close 

 together. The interspaces are flat and show a well marked longitudinal 

 acieulation, probably due to the impress of a coating of hairs. Legs want- 

 ing. Length, from front of prothorax to the tip of the elytra, 4.45 mm. 



Station number 17. Collected by Mrs. W. P. Coekerell. The type is in 

 the Museum of the University of Colorado. 



• Represented by a single specimen in beautiful condition as 

 regards the characters of the upper surface. It is sufficiently 

 differentiated from all of the other Florissant species by the 

 shape and punctuation of the prothorax. The nearest ally seems 

 to be B. liaywardi, and the description of that insect should be 

 consulted for additional differential features. The antennae are 

 represented as slightly too slender in the drawing. 

 Named for Dr. Henry Fairfield Osborn. 



Platydema Lap. 



P. ANTIQUORUM n. sp. (Plate IV, Fig. 4.) Form moderately robust. 

 Head much narrower than the prothorax, distinctly broader than long. 



