XII LIST OF ILLUSTRATIONS 



Page 

 6-7. Head of humerus of Micropalama hesternus, anterior and posterior 



view. (X 2) 12 



8-9. Lower end of tarso-metatarsus of Chloroenas miciila, anterior and 



posterior views. (X 2) 14 



A SYNOPSIS OF THE SPECIES OF BoECKELLA AND PsEUDOBOECKELLA WITH 

 A KEY TO THE GENERA OF THE FRESH-WATER CeNTROPAGIDAE 



By C. Dwight Marsh 



1-2. 1, Boeckella asymmeirica Searle, fifth feet of male, after Searle. 



2, B. bergi Richard, fifth feet of male, after Sars 5- 



3-4. 3, Boeckella coronaria Henry, fifth feet of male, X 212, after 



Henry. 4, B. fluvialis Henry, fifth feet of male, X 153, after 



Henry S 



5-7. 5, Boeckella gracilipes Daday, fifth feet of male X 165. 6, B. 



gracilipes Daday, fifth foot of female X 165. 7, B. gracilis 



Daday, fifth feet of male, after Daday T 



8-10. 8, Boeckella insignis Smith, fifth feet of male, after Smith. 9, 



B. longiseta Smith, fifth feet of male, after Smith. 10, B. 



michaelseni Mrazek, fifth feet of male, X 120, after Mrazek 9' 



11-13. 11, Boeckella minuta Sars, fifth foot of female, X 150, after Sars. 



12, B. minuta Sars, fifth feet of male, X 150, after Sars. 13, B, 



nyoraensis Searle, fifth feet of male, after Searle 10^ 



14-16. 14, Boeckella oblonga Sars, fifth feet of male, X 114, after Sars. 



15, B. occidentalis Marsh, fifth feet of male, X HO. 16, B. 



orientalis Sars, fifth feet of male, after Sars 11 



17-19. Boeckella poopoensis Marsh, fifth feet of male, X 44. 18, B. 



propinqua Sars, fifth feet of male, X 56, after Sars. 19, B. 



pseudocheles Searle, fifth feet of male, after Searle 13 



20-21. 20, Boeckella robusta Sars, fifth feet of male, after Sars. 21, B. 



rubra Smith fifth feet of male, after Smith 14 



22-23. 22, Boeckella saycei Sars, fifth feet of male, X 170, after Sars. 



23, B. searli Sars, fifth feet of male, after Sars 16- 



24-26. 24, Boeckella symmetrica Sars, fifth feet of male, X 114, after 



Sars. 25, B. tenera Sars, fifth feet of male, after Sars. 26, B. 



triariiculala Thompson, fifth feet of male, X 87, after Sars 17 



27-28. 27, Pseudoboeckella braziliensis Lubbock, fifth feet of male, after 



Mrazek. 28, P. brevicaudata Mrazek, fifth feet of male, after 



' Mrazek 20 



29-31. 29, Pseudoboeckella dubia Daday, fifth feet of male, after Daday. 



30, P. longicauda Daday, fifth feet of male, after Daday. 31, 



P. poppei Mrazek, fifth feet of male, after Poppe and Mrazek. _ 22 



32-34. 32, Pseudoboeckella setosa Daday, fifth feet of male, after Daday. 



33, P. silvestri Daday, fifth feet of male, after Daday. 34, P. 



silvestri, Daday, fifth foot of female, after Daday 23 



35. Pseudoboeckella vallentini Scott, fifth feet of male, after Scott — 25- 



Fossil insects in the United States National Museum 



By T. D. A. Cockerell 



1. Diagram of venation of Dinopanorpa megarche. 1, Costoapical 



region. 2, Region of M-Cu cross vein. 3, Region of union of 



M with Cu (hind wing) 3 



2. Diagram of venation of Amagua fortis '^ 



