CONTENTS 



Article 



Aldrich, J. M. Notes on Francis Walker's types of North 

 American flies of the family Tachinidae. No. 2910, pp. 

 1-16. November 10, 1931 1 10 



. North American two-winged flies of the genus 



Spathimeigenia, with descriptions of five new species. No. 

 2911, pp. 1-10. December 31, 1931 ^ 11 



New species: Spathimeigenia mexicana, S. obscura, S. ereda, 

 S. bridwelli, S. lexensis. 



. Records of dipterous insects of the family Tachinidae 



reared by the late George Dimmock, with description of one 

 new species and notes on the genus Anetia Robineau- 

 Desvoidy. No. 2920, pp. 1-8. March 31, 1932 ^ 20 



New species: Anetia dimmocki. 



Bartsch, Paul. The West American mollusks of the genus 



Acar. No. 2909, pp. 1-4. November 23, 1931 ' 9 



New species: Acar bailyi, A. panamensis. 



. A new marine shell of tiie genus Xenophora from 



Florida. No. 2917, pp. 1, 2. December 31, 1931 ' 17 



New species: Xenophora longleyi. 



Caudell, a. N. Insects of the order Orthoptera of the Pinchot 



Expedition of 1929. No. 2921, pp. 1-7. August 10, 1932 L 21 



New species: Patanga pinchoti. 



Chitwood, B. G. a review of the nematodes of the genus 

 Hastospiculum, with descriptions of two new species. No. 

 2919, pp. 1-9. April 28, 1932 1 19 



New species: Hastospiculum setiferum, H. onchocercum. 



Clark, Austin H. Echinoderms from the islands of Niuafoou 

 and Nukualofa, Tonga Arcliipelago, with the description of 

 a new genus and two new species. No. 2905, pp. 1-12. 

 January 30, 1932 ' 5 



New genus: Zenocentrotus. 



New species: Zenocentrotus kellersi, Z. paradoxus. 



• Date of publication. 



V 



