CONTENTS. 
^ On the Species of the Genus Chalcinus in the Museum of Com- 
parative Zoology at Cambridge, Mass., U. S. A., by Samuel 
Garman. 1 
^ On Species of Gasteropelecus, by Samuel Garman, ... 8 
y On Species of Cynopotamus, by Samuel Garman,- ... 11 
^ On the Species of the Genus Auostomus, by Samuel Garman, . 15 
The Mouth-Parts of the Thysanoptera, by H. Garman, . . 24 
A NcAY Fresh-Water Crustacean, by H. Garman, ... 28 
The Stratified Rocks of Essex County, by John H. Sears, . 31^ 
w^ On a Genus and Species of the Characines, by Samuel Garman, 49 
iX)n Batistes Vetula Linne, by Samuel Garman 63 
V Silurus (Parasilurus) Aristotelis, by Samuel Garman, . . 56 
VOu the '' Gila Monster," by Samuel Garman, .... 60 
The Difterence between tlie Geographic Turtles, by H. Garman, 70 
A Lost Paper on Hugh Peter, communicated byR. S. R., . 84 
A Study of Summer Ceremonials at Zuui and Moqui Pueblos, by 
J. Walter Fewkes. 89 
Annual Meeting, Monday, May, 1890, 11.5 
Officers elected, 116; retrospect of the year, 116; field meet- 
ings, 117; meetings, 123; library, 136; cabinets, 151; treas- 
urer's report, 153 ; necrology of members, 154. 
