EMiBTOPTE'EA OF THE NEW WOKLD ROSS 403 



Almost without exception the descriptions and figures presented by 

 the writer, as well as by Davis, are made from specimens treated in 

 10-percent potassium hydroxide, and, after due procedure (Ross, 

 1940b, p. 634), mounted on slides. Unless this preparation for study 

 is used, many of the minute characters of the abdominal terminalia 

 cannot be seen or be compared on a common basis of interpretation 

 with the results of recent studies wherein such methods were used. 



In this revision it has been the practice, where the writer has noth- 

 ing to add to the knowledge of a species or genus, to cite only the 

 references and the type locality. Most such abbreviated treatments 

 involve species that have already been fully described and illustrated 

 by Consett Davis or the writer. 



In the synonymies the asterisks serve to identify the references with 

 the corresponding locality records given in the text following. 



GENERAL EXPLANATION OF FIGURES 



The drawings are based upon simple camera lucida outlines. Setae, 

 indications of pattern, and relative degree of sclerotization have been 

 omitted. Membranous areas are represented by stippling. In the 

 figures of the head, the mandibles are often shown spread apart ; the 

 palpi, terminal antennal segments, and facets of the eyes have been 

 omitted. No attempt has been made to adopt a uniform scale. Ex- 

 planation of syvihols: 8= eighth, 9 = ninth, 10= tenth abdominal ter- 

 gites; 10 L=left hemitergite of tenth tergite; 10 Upright hemitergite 

 of tenth tergite; 10 LP = process of 10 L; 10 EP, 10 RP^, 10 RP2= 

 processes of 10 R; H=hypandrium or ninth abdominal sternite; 

 HP = process of H; LPPT and RPPT=left and right paraprocts; 

 LCB and RGB = left and right cercusbasipodites; LCB + LPPT = com- 

 posite left cercus-basipodite and left paraproct; LCi=basal segment 

 of left cercus. These symbols are the same as those used by Davis 

 except for LPPT and RPPT, which he regards as hemisternites of the 

 tenth sternite (XL and XR). 



ACKNOWLEDGMENTS 



The writer is indebted to the following individuals who generously 

 lent material for this study from their private or institutional collec- 

 tions : Nathan Banks, Museum of Comparative Zoology, Cambridge, 

 Mass. (MCZ) ; Max Biraben, La Plata Museum, La Plata, Argentina 

 (LPM) ; Alfons Dampf, Escuela Nacional de Ciencias Biologicas, 

 Mexico, D. F. ; Henry Dietrich, Cornell University (CU) ; E. A. 

 Chapin and A. B. Gurney, United States National Museum, Wash- 

 ington, D. C. (USNM) ; Kenneth J. Hayward, Tucuman, Argentina; 

 Institute Miguel Lillo, Tucuman, Argentina; Edward McC. Callan, 



