EXPLANATION OF TLATES. 



I'LATE 1. 



Fig. 1. Dorsal view of the riglit valve of the genital segment of Elcodes 

 nignna; showing the chitiuous, moderately i)roduced apex, evenly 

 and broadly rounded at tip. with the valvular membrane rather 

 largely exposed within and caudad to the superior pudendal mem- 

 brane. 



2. A'entral view of the left valve of Elcodes nignna; showing submar- 



ginal groove, concave ventral surface of apex and part of the genital 

 fissure. 



3. Dorsal view of the apicale of the edeagophore of Elcodes nigrum; show- 



ing the depressed and broadly nienibrano-chitinous area at middle. 



4. Dorsal view of the genital segment of Elcodes giganieu; showing the 



fully exposed superior pudendal membrane, falciform dorsal plates, 

 chitinous and everted apices, and minute appendages. 



5. 'N'entral view of the left valve of the genital segment of Elcodes gi- 



gunicu ; showing the broad submarginal groove continuous with the 

 concavity of apex, straight internal margin of the valve, and absence 

 of the genital fissure. 



6. Dorsal view of the apicale of the edeagophore of Elcodes gigantca; 



showing the broadly and strongly depressed membranous surface 

 and slightly recurved apex. 



7. Dorsal view of the left valve of the genital segment of Elcodes longicol- 



lis; showing its i-esemblance to that of gigantca, but more strongly 

 punctate. 



8. Dorsal view of the right valve of the genital segment of Elcodes grandi- 



collis; note the truncate apical margin of the dorsal plate, I'ectangular 

 angle, truncate appendage, and short pudendal membrane. 



9. Dorsal view of the right valve of the genital segment of Elcodes tene- 



brosa ; note the plane dorsal plate, long, slender, subacute, and mem- 

 branous apex ; compare with figs. 1 and 2. 



10. A'entral view of the left valve of the genital segment of Eleodes tcne- 



hrosa; showing evenly convex surface and subapical fissure. 



11. Dorsal view of the right valve of the genital segment of Eleodes pedi- 



noides, typical form ; note the explanate and plane dorsal plate which 

 is evanescent apically into the well-developed external apical lobe, 

 also the small rudimentary internal lobe and long pudendal membrane. 



12. Dorsal view of the right valve of the genital segment of Elcodes ex- 



Irivata, typical form; note the oval-oblong dorsal plate, acute and 

 small apex, large and flattened appendage. 



13. Dorsal view of the right valve of the genital segment of Eleodes ob- 



scura, typical variety; note the dorsal position of the submarginal 

 groove, dorsal plate apparently contracted with sides arcuately re- 

 flexed, surface deeply concave, basal prominences sti'ongly developed. 



14. Dorsal view of the right valve of the genital segment of Eleodes sutura- 



lis; compare with flgs. 23, 13, 15, 16, and 17. 



501) 



