TABLE OF CONTENTS VII 



FosHA(., William F. The minerals of Obsidian Cliff, Yellow- Article 

 stone National Park, and their origin. No. 2618. pp. 1-18. 

 June 14, 1926^ 1 17 



Hay, OLI^^Bl{ P. A collection of Pleistocene vertebrates from 

 southwestern Texas. No. 2625. pp. 1-18. June 7, 1926i___ 24 

 New species: Vamelopn aranf<an, Anancus orariuti, A. defloccaUiS. 



Malloch, J. R. New genera and species of Acalyptrate 

 flies in the United States National Museum. <■ No. 2622. 

 pp. 1-35. May 29, 1926' 21 



New genera : Xenopterella, Stenolauxania, Ccphalella, SctuUna, 

 DryomijzoidcK. Xeominctiia, Chactoniinettiu, Neosctitops. i>'chil- 

 domyia. 



New species : Xenopterella oMiqna, titcnoJauxnnia striata, Lau- 

 xanicUa nuheculn, VcpJtalclhi funiipeimin, Oamptoprosopella aira, 



C. latipitnctota, C. fiavipaJpis, SctuUna prima, Dryatnyzoides 

 advena, Chaetaminettia spinitihia, Chaetocoelia, tripunctata, 

 Minettia tripuncticeps, M. emttata, M. thictinervis, M. fu»ci- 

 nei'vis, M. genlseta, M. assimilis, Pseudogriphoneura palUpes, 

 P. hyalipennifi, P. {Melanomyza) lateralis, P. (M.) aliena, P. 

 {Ncodccia) marmorata, Saproniyza nigroapicata, Scutops inaculi- 

 pennis, Neoscutops rotundipemiis, ScMldoniyia tnttUhorax, tS. 

 hrevihirta, S. punctifrons, Drosophila panameiisis, D. piUfacies, 



D. spinicauda, D. nigricosta, D. bicol&ripes, Amiota stcganoptera, 

 Leucophenga unifasciventris, L. acutipenms, L. tripiinctipentm, 

 Clastopteromyia. macuHpennis, C. longipemm. 



Systematic notes on and descriptions of North Ameri- 

 can wasps of the subfamily Brachycistiinae. No. 2604. 

 pp. 1-28. February 17, 1926 ^ 3 



New subgenus: Brachycistis (Braohycisiina). 



New species: Brachycistis normalis, B. {Brachycistis} rugosa, 

 B. (B.) suhcarinata, B. (B.) texana, B. {B.) parva, B. (B.) 

 nigrifrons, B. (B.) curvata, B. (B.) utahoisis, B. (B.) inter- 

 media, B. {B.) verticalis, B. (B.) melanocephula, B. (B.) dako- 

 tcnsis, B. (B.) washingtona, B. (B.) imitans, B. {B.) Incustris, 

 B. {B.) seniiaira, B. (Brachycistina) acuta. 



Marshall, William B. New fossil fresh-wat<ir moUusks from 

 Florida. No. 2612. pp. 1-4. February 19, 1926 ^ 11 



New species: Lymnaca (Pseudosuccinca) harieri, L. (P.) aperta, 

 Planorhis (PJariorbin-a) prcglahratus. 



McAtee, W. L. Revision of the American leaf hoppers of 

 the Jassid genus Typhlocyba. No. 2619. pp. 1-47. June 

 10, 1926^ 18 



New species: Typhlocyha piscator, T. unca, T. persepJtone, T. 

 cuphrante, T. aristc, T. xanthippc, T. ariadnc, T. duplicata', T. 

 lancifer, T. niohe, T. pomarla, T. athene, T. arsinoc, T. andro- 

 ntache, T. tnelite, T. phryne, T. antigone, T. nioaretc, T. clymGne, 

 T. danae, T. euri/dicc, T. berenice, T. hermimie. 



^ Date of publication. 



