Explanation of Plate IV. 



(J. Terminal segments and genital armature. 



The figures on this and the following three plates (all x 30, 

 except the few enlarged to x 60 specially noted) show one or more 

 of the terminal abdominal segments — in their natural position or in 

 profile, or the portions of the genital armature exposed in the dried 

 specimens examined. In some of them the armature is completely 

 evaginated, in others it is partly or entirely withdrawn into the 

 internal sac ; but the selection given shows the general arrangement 

 and position of the various pieces, both in the evaginated and 

 non-evaginated condition, in Discodon, Polemius, etc. 



Fig. 1. Podabrus mexicanus, Gorh. : terminal segments, ventral 



aspect. 

 2. „ caliginosus, n. sp. : terminal segments, with the 



membranous unarmed internal sac partially 



extruded. 

 3,3a. Discodon erosum, Gorh.., ^ : 3, eighth ventral segment ; 



3«, genital armature [injured by dissection 



and perhaps incorrectly placed]. 



4, 4cr. ,, emarginatum, n. sp. : 4, ninth ventral segment 



and a portion of the genital armature ; 4a, 

 ditto, X 60. 



5. „ sinuatum, n. sp. : eighth ventral segment. 



6, 6a, h. „ podabroides, Pic : 6, ventral segments 6-8, 



7 developed into a pair of forceps ; 6a, ninth 

 segment and a portion of the genital arma- 

 ture ; 66, ditto, x 60. 



7. „ plicatum, Gorh. : ninth ventral segment and 



a portion of the genital armature. 



8, 8a. „ stramineicolle, n. sp. : 8, eighth ventral seg- 



ment; 8a, ninth ventral segment and a 

 portion of the genital armature. 



9. „ fuscipenne, n. sp. : ninth ventral segment and 



a portion of the genital armature. 

 10, 10a. „ inconstans, n. sp. : 10, eighth ventral segment, 



in profile, the dorsal portion of the same 



segment visible ; 10a, ninth segment, and a 



portion of the genital armature, in profile. 

 11,11a. „ biolleyi, n. sp. : 11, ninth ventral segment 



and a portion of the genital armature ; 



11a, ditto, in profile. 

 12,12a. ,, vitticolle, Gorh.: 12, genital armature; 



12a, ditto, X 60. 



13, 13a. „ chiriquense, Pic : 13, genital armature ; 



13a, ditto, in profile. 



14. ,, sinuaticolle, n. sp. : ninth ventral segment 



and a portion of the genital armature. 



