184 



The Biological Society of Washington. 



O 



Obeliscus 2 



ventricosus 4 



Obtortio 14 



Oceanida . 14 



gradata 14 



Oda 12 



Odetta 12 



callipyrga 12 



elegans 12 



Odostomia 4, 9, 13 



americana 12, 16 



callipyrga 12 



couspicua 13 



dolioformis 12 



fenestrata 8 



jeffreysiana 10 



nitens 12 



pilsbryi 10, 15 



rissoidea 13 



turricula 11 



Odostomiella 10 



Oldys, H. VV. The use of our musical 

 scale by birds viii 



Some new bird songs .... x 



Onychomys albescens 124 



canus 124 



tularensis 123 



yakiensis 124 



Onychopterus 42 



Orina pinguicula 6 



Orinella 6 



Osgood, \V. H. The caribou of Alaska viii 



Haplomylomys, a new subgenus 



of Peromyscus 53-54 



Thirty new mice of the genus 



Peromyscus Irom Mexico and Gua- 

 temala 55-78 



Two new pocket mice of the 



genus Peiugnatlius 127-128 



Otopleura 5 



P 



Palmer, Wm. Gyrostachys simplex in 



Virginia 165 



Parthenia armata 11 



diadema 11 



Parthenlna 10 



Parthenope 170 



Parus wollweberi . 26 



Pedicularis gray! 100 



proeera 100 



Pelexia setacea 116 



Pentstemon formosus 100 



glaber . 97 



kennedyi 97 



pulchellus 100 



puniceus lOO 



roezli . . . 97 



superbus 100 



violaceus 96 



Peristichia 9 



toreta 9 



Perodipuscabezonae 144 



groldmani 143 



ingens ... 141 



levipes 145 



microps 145 



montanus 140 



simulans 144 



tularensis 143 



utahensis 143 



venustus 142 



Perognathus perniger 127 



ochrus 128 



Peromyscus allex 76 



allophylus 71 



Peromyscus altilaneus 74 



amplus 62 



angelensis 69 



badius 70 



bullatus 63 



castaneus 58 



consobrinus 66 



evides 64 



eremicoides 60 



ereinicus 54 



fulvus 57 



gentilis 61 



goldmani 75 



lophurus 72 



melanocarpus 73 



mesomeias 57 



nigrescens 76 



pectoralis 59 



phsurus 75 



polius 61 



simulatus 72 



simulus 6'! 



teapensis 69 



vicinior 68 



xenurus 6" 



zamelas 59 



zamorse 65 



zelotes 67 



Pliacelia monosperma ....... 95 



Pliarcidella 4 



folinii 4 



Pinnaxodes meinerti 162 



Pitangus derbianus 26 



Pleurogyne fontana 177 



Pocket gophers, a study of vii 



Porzana goldmani 151 



Pseudurissolna 13 



Ptycheulimella 7 



Pyramidella 3, 4 



auricoma 4 



auris-cati 5 



clandestiiia 6 



cossmani 5 



dodona 6. 14 



jainaicensis 5 



iiitidula 5 



paumotensis 5 



punctata 4 



pyraniidata 7 



subulata 5 



Pyramidellida? ... 3 



P'yrgisculus . . 8 



Pyrgiscus 8 



Pyrgolampros 7 



mioperplicatulus 7 



Pyrgolidium 8 



roseum 8 



Pyrgulina 11 



Q 



Quaking aspen, scars on viii, x 



R 



Rathbiui, M. J. A preoccupied crab 

 name 102 



Descriptions of three new spe- 

 cies of American crabs . . . .161-162 



Some changes in crustacean 



nomenclature 169-172 



Ridgway, Robt. Naitnorchilus, new 

 name for Hemiura, preoccupied . . 102 



Rissoa doliatum 10 



pyrrhacme 14 



Rissoeliaeburnea 14 



Rose, J. N. Revision of N. A. Crassul- 

 acea; viii 



