VI TABLE OF CONTENTS. 



Page. 



Gibson, Edmund H. A review of the leafhoppers of the 

 genus Gypona north of Mexico. No. 2289. August 6, 

 1919 ' 87-100 



New species: Gypona dictitoria, G. nixabunda, G. cacozela, G. occlvsa, 

 G. curiata, G. negotiosa, G. aquila, G. dracontea. 



GiLMORE, Charles W. A mounted skeleton of Dimetrodon 

 gigas in the United States National Museum, with notes 

 on the skeletal anatomy. No. 2300. December 15, 1919> _ 525-539 



. New fossil turtles, with notes on two described 



species. No. 2292. July 30, 1919 ^ 113-132 



New species: Neurankylus wyomingensis , Boremys alherfetisis, 

 Agomphu^ alabarnensis , Aspideretcs latus. 



Hat, Oliver P. Descriptions of some mamalian and fish 

 remains from Florida of probably Pleistocene age. No. 

 2291. July 31, 1919^ *. 103-112 



New geniis: Thinobadistes . 



New species: Thinobadistes segnis. Felis veronis, Atraclosteus 

 lapidosits. 



McEwAN, EuLA Davis. A study of the brachiopod genus 



Platystrophia. No. 2297. September 2, 1919 » 383-448 



New species: Platystrophia uniplimta, P. precedent, P. trentonensis, 

 P. hermitagensis, P. extensa, P. ehgantula, P. amoena, P. globosa, 

 P. rhynchonekiformis, P. juvensis, P. strigosa, P. nitida, P. corry- 

 villensis, P. sublaticosta, P. foerstei, P. attenuate, P. cumingsi, 

 P. elkhornensis, P. preponderosa, P. fervalensis. 



New varieties: Platystrophia daytonensis laurelensis, P. trentonensis 

 champlainensis, P. t. perplana, P. elegantula triplicata, P. e. 

 amplisulcata, P. amoena longicardinalis, P. precursor latiformis, 

 P. p. angustata, P. foerstei ampla, P. ponderosa arnheimensis, P. 

 unicostata crassiformis, P. cypha tumida, P. c. arcta, P. c. bellatula. 



McGregor, E. A. The red spiders of America and a few 

 European species likely to be introduced. No. 2303. 

 January 8, 1920^ 641-679 



New genera: Anychus, Septanychus. 



New species: Tetranychus pacificvs. 



Timberlake, P. H. Revision of the parasitic Chalcidoid 

 flies of the genera Homalotylus Mayr and Isodromus 

 Howard, with descriptions of two closely related genera. 

 No. 2293. August 29, 1919 1 133-194 



New genera: Anisotylus, Brethesia. 



New species: nomatotylus mexicanus, H. quaylei, II. a/ricanns, H. 



cockerelli, H. affinis, H. brevicauda, H. hyperaspidis, H. puncii- 



frons, Anisotylus palkntipes, Isodromus axillaris, Brethesia 



latifrons. 



New subspecies: Anisotylus similis texanus. A. s. vtahensis. 



1 Date of publication. 



