IV TABLE OF CONTENTS. 



CusHMAN, R. A. North American Ichneumon-flies, new 



and described, with taxonomic and nomenclatorial page. 



notes. No. 2334. November 8, 1920 ^. 251-292 



New genus: Oligotm.ema. 

 New subgenus: Areolopristomerus. 



New species: Phaeogenes arcticus, Ischnopsidea coloradensis, Spilo- 

 cri/pttLS propodeum, Panargyrops texanus, P. pacificus, Thysiotorus 

 smithi, Phthorima extensor, P. sulciclypeus, Angitia galleriae, 

 Eiphosoma {Eiphosoma) bruesi, Pristomerus (Areolopristovierus) 

 smithi, P. (Pristomerus) fusdpennis, P. (P.) laticeps, P. (P.) 

 ocellatus, P. (P.) minutus, P. (Neopristomerus) melleus, Oligotmema 

 primn, Cremastiis brevinervis, C. bruneiceps, C. (Zaleptopygus) 

 obesus, C. (Z.) latithorax, C. (Z.) attenuatus, C. (Z.) dorcaschemae, 

 Bassus acrohasidis, Orgilus gelechiaevora, Habrobracon erucorum. 



. The North American Ichneumon-flies of the 



tribe Ephialtini. No. 2340. November 10, 1920 * 327-362 



New species: Ephialtes (Ephialtes) longigenalis, E. (Itoplectis) 

 latus, E. (I.) leavitti, E. (J.) pacificus, E. (J.) montqna, E. (I.) 

 temnopleuris, Apechthis pacificus. 

 . The North American Ichneumon-flies of the 



tribes Lycorini, Polysphinctini, and Theroniini. No. 



2326. September 3, 1920 » 7-48 



New genera: Chloroly carina, Zabrachypus. 



New species: Chlorolycorina soror, Toxophoroides glaucomatus, 

 Colpomeria mellithorax, Polysphincta (Polysphincta) elongala, P. 

 {Zatypota) braucheri, P. (Z.) calif orniensis, P. (Z.) crosbyi, Zabra- 

 chypus primiis. 

 FosHAG, William F. Some recent accessions to the min- 

 eral collections of the United States National Museum. 



No. 2337. November 13, 1920 ^ 303-305 



. The chemical composition of Hydrotalcite and 



the Hydrotalcite group of minerals. No. 2329. Sep- 

 tember 9, 1920 ^.. -- - 147-153 



Fowler, Henry W., and Barton A. Bean. A smaU col- 

 lection of fishes from Soochow, China, with descriptions 



of two new species. No. 2338. November 3, 1920 ^ 307-321 



New genera: ExogJossops, Micropercops. 

 New species: Exoglossops geei, Micropercops dabryi. 

 GiRAULT, A. A. New Serphidoid, Cynipoid, and Chalcidoid 



hymenoptera. No. 2332. September 9, 1920^ 177-216 



New genera: Paraceraptrocerus, Tyndarichoides. 

 New species: Polymecus semiglaber, Telenomus poeia, Ceraphron 

 carlylei, Macroteleia rushini, Hudronotus ajax, Psilodora cultra, 

 Microstilba americana, Paraceraptrocerus africanus, Habrolepoidea 

 perplexa, Achrysopophagus io, A. nigricornis, A. rex, Tyndari- 

 choides mexicanus, Blastothrix briitanica, Acnnthochalds unispinosa, 

 Diplodontia secunda, Pseudiglyphomyia pulcheria, Emersonella 

 fusdpennis, Achrysocharis camilli, Rhicnopeltomyia marylandi, 

 Sympiesomorphelleus mediolineatus, Neomphaloidella ixtlilxochitli, 

 Comedo neomexicanus, Dimmockia marxjlandica, Isomeralia azteca, 



1 Date of publication. 



