4 PROCEEDINGS OP THE NATIONAL MUSEUM vol.68 



Their application is shown in figures 40, 41, and 110, and their 

 equivalents in the following table : 



MALE (figs. 40 AND 4l) 



Terms in this paper Equivalents 



Ninth segment (a) Pygofers (the plural is incorrect.) 



Anal tube (b) Anal tube. 



Outer clasper (c) Plates. 



Inner clasper (d) Styles, gonostyli, parameres. 



Connective (e) Connective. 



Aedeagus (f) Same term spelled in various ways; penis. 



FEMALE (FIG. 110) 



Ninth segment (a) Valvifer. 



Anal tube (b) Anal tube. 



Ovipositor sheath (c) Valvulae. 



Eighth sternite (d) Genital plate; ultimate ventral segment. 



RELATION OF THE GENITALIA IN COPULATION 



In copulation members of the genus Typhlocyha assume a tail 

 to tail position. The entire hypopygium of the female is elevated, 

 as is also the anal tube of the male. The upper posterior angles of 

 the ninth segment (often toothed within) of the male press against 

 the sides of the female hypopygium. The outer claspers extend 

 over, and the inner claspers under the eighth sternite of the female. 

 The aedeagus is inserted into the ninth segment just behind and 

 above the eighth sternite (fig. 110). 



SOURCES OF MATERIAL 



Besides the collection of the United States National Museum, 

 material from the following sources has been available for the pres- 

 ent study: Museum of Comparative Zoology (through Nathan 

 Banks) ; Illinois State Natural History Survey (through S. A. 

 Forbes and T. H. Frison) ; Nova Scotia Department of Agriculture 

 (through W. H. Brittain) ; British Columbia Department of Agri- 

 culture (through W. Downes) ; State College of Iowa (through Carl 

 J. Drake) ; University of Kansas (through Paul B. Lawson) ; and 

 the private collections of E. D. Ball, and the author. Throughout 

 the following pages names or abbreviations in parentheses indicate 

 the location of the specimens recorded. Tlie writer nuich appreciates 

 the cooperation of the individuals and institutions named above. 



Further acknowledgment is due J. R. Malloch, who made special 

 efforts to collect material and donated it to the writer, and who 

 made the drawings for Plate 1. 



