37(o Mr. C. Forster-Oonper on Thaumastotlierium osborni. 



shorter than next two combined ; mesothorax shining, with 

 strong scattered punctures; mesopleura dull, strongly and 

 closely punctured; area of metathorax semilunar, sharply 

 defined behind, with fine weak ridges, the sculpture un- 

 usually fine for a Trachandrena ; tegulre dark reddish. Wings 

 reddish hyaline ; nervures and the large stigma chestnut- 

 red; b.n. meeting t.-m., second sin. receiving first r.n. 

 beyond middle. Hair of legs pale ; scape of hind tibia 

 rather small, white. Abdomen shining, strongly punctured, 

 second segment in middle depressed a little less than half ; 

 white hair-hands at sides of second segment, on third except 

 in middle, and right across fourth; hair at apex of abdomen 

 pale fulvous. 



Hub. Beulah, New Mexico (Canadian Zone), at flowers of 

 •wild plum, May 30 {Wilmatte Porter). 



On account of the weak sculpture of the metathoracicarea 

 this resembles A. radiatula, Ckll., but that species has the 

 second abdominal segment depressed more than half, and 

 the hind tibia? and tarsi are not ferruginous. 



Andrena argentiniee, var. tricliomelana, v. n. 



<$ . — Hair of face entirely black ; of cheeks, legs, and 

 sides and venter of abdomen mainly black or sooty. 

 § . — Hair of face entirely black. 



Hub. Florissant, Colorado, 2 <$ (one of them the type) 

 and 1 ? at flowers of iSalix brachycurpa ; 1 <$ at flowers of 

 Pibes vallicola, June 10, 1907. All collected by S. A. 

 Hohwer. 



A. argentinia was described as A, vicina argentinue, Ckll., 

 but it is probably a distinct species. 



At Longs Peak Inn, Colorado, alt. 8956 ft., June 25 and 

 26, 1913, I took Andrena marice, Hob., A. tacituta, Ckll., 

 A. cyanophila, Ckll., and A. medionitens, Ckll. These records 

 are of interest on account of the altitude. 



XLIV. — Thaumastotlierium osborni, a new Genus of Perixso- 

 dactyles from the Upper OUgocene Deposits of the Bugti 

 Hills of Baluchistan. — Preliminary Notice. By U. 

 FOKSTER-COOPER, M.A., University Demonstrator in 

 Comparative Morphology, Cambridge. 



DURING an expedition to Baluchistan in 1911 I found, among 

 other fossils, a mammalian atlas and dorsal vertebra remark- 

 able for their unusually large size. These 1 suggested 



