200 GENUS ARENIVAGA (BLATTIDAE) 



DD. Dextro-ventral genital plate vertically narrow, broadly and 

 roundly angulate-emarginate to near its base sinistrad of median 

 point, the dextral portion thus formed a small smooth rounded 

 lobe, the sinistral portion an irregularly rounded angulate pro- 

 jection of equal height 6. tonkawa new species 



BB. Dextro-ventral genital plate with productions. (Dextro-dorsal genital 

 plate large and lobiform, but with sinistral margin concave and sub- 

 chitinous.)^ 

 C. Dextro-ventral genital plate armed sinistro-distad with a moderately 

 elongate, slightly curved, heavy spike, directed meso-distad. 



7. apacha (Saussure) 

 ('C. Dextro-ventral genital plate armed meso-distad with an elongate, 

 straight, heavy spike, adjacent to which sinistrad is a chitinous 

 process of equal length, which is enlarged distad, with apex rounded, 

 and bears on the meso-distal portion of the dextral margin a min- 

 ute tooth 8. genitalis C'audcll 



Key to Females of the Species of Arenivaga^ 



(Head remarkably different from that of male, transverse clypeal swelling 

 of face deep. Ocelli minute. Body covered with minute hairs; longer hairs 

 along the margin, i)articularly cei)halad. Tegmina and wings absent. Sub- 

 genital i)late broadly convex in general form, without a sulcus or any decided 

 production meso-distad. Cei:)halic femora with ventro-cephalic margin 

 hairy proximad, succeeded in distal half by a row of rather closely set, short, 

 chaetiform spines.) 



A. Form suborbicular. Size large to medium. (General color blackish. 

 Cephalic margin of pronotum often rather narrowly buff, the caudal 

 margin of this marking brace-sha]:)ed.) Central Texas. 



1. bolliana (Saussure) 

 A A. Form narrower, broad oval to oval. Size medium to rather small. 

 B. General color blackish. (Cephalic margin of pronotum rather broadly 

 reddish yellow.) Greatest width of body more nearly mesad. Cen- 

 tral-western Florida 4. floridensis Caudcll 



" In apacha this plate is produced inward from its sinistro-distal jiortion 

 in an elongate heavy spike, the internal margin beyond the base of this spike 

 armed with two small teeth (see plate VII, figure 15). 



In (jcnUaUs this plate is produced inward from its sinistro-distal jiortion 

 in a iieavy, chitinous, rounded process, the dorsal surface of which is sha- 

 greenous, bearing on its dextral margin two small but heavy teeth (see i)latc 

 VU, figures IG and 17). These portions, as thej' are directed inward, are 

 normally concealed and can not be seen without dissection uf jwrtions of 

 the concealed genitalia. 



"As we have stated elsewhere, great di(iicuhy in delermiiiiiig females of 

 .some of the species of this genus is experienced. .\t the ])resciit time the 

 female sex of ycnilalis has not been recognized. 



