212 



GENUS ARENIVAGA (BLATTIDAE) 



Measurements {in miUimeters) 



Length of Length of Width of Length of Width of 



cf body pronotum pronotum tegmen tegmen 



Round Mountain, 



Texas (3) 15.4-17.5 5.1-5.3 7.7-8 20.3-21 7.5-7.8 



Carrizo Springs, 



Texas, type "18 5.7 8.7 22 8.8 



Carrizo Springs, Tex- 

 as, paratypes {5} . . 13.5-lG 4.2-5 6-7.3 16.6-18.8 6.3-7.2 



Sabinal, Texas 15 5 7.3 18.8 7.2 



Brownsville, Texas 



(9) 14.8-15 3 4.6-4.9 6.4-6.8 16.9-17.6 6.3-6.4 



Width of Width of 



9 mesonotum metanotum 



Round Mountain, 



Texas 16 5.4 8.6 11 116 



Carrizo Springs, 



Texas, aUolype.... 14.4 4.8 7 9.1 9.8 



Carrizo Springs, Tex- 

 as, pora/ypes (3).. . 13.8-15.3 4.8-5.3 6.8-7.8 8.7-9.7 9.4-10.6 



Sabinal, Texas (4)... 13.8-14.8 5-5.2 6.7-7.9 8.9-9.5 9.7-10.3 



Larger series will, we believe, show even greater size variation, 

 apparently not due to geographic distribution but produced 

 by local environmental influences. Such is true for the related 

 erratica, of which species we have much larger series. 



General coloration of male ochraceous buff. Pronotum with a light brown 

 shield-shaped marking meso-caudad, usually showing points of darker brown, 

 often with the ground color jialing latero-cephalad. In recessive examples 

 this marking is pale yellowish brown, with darker points subobsolete. The 

 tegmina, as in erratica, are ochraceous buff, obscurely marbled with a slightly 

 darker shade and showing very little gloss. Head with eyes and occiput 

 to antennal sockets dark brown. 



(ieneral coloration of female above burnt umber to tawny, the cephalic 

 margin of the pronotum usually vaguely paler. All but the darkest indi- 

 viduals faintly maculate on the pronotum, mesonotum and metanotum 

 with a darker shade. Meso-laterad oji each abdominal segment, both above 

 and below, a dot of darker brown is usually present. Covering of minute 

 liairs tawny. Underparts, particularly h(>ad and limbs, somewhat paler. 



In addition to the type and allotype, five males and three 

 females, l)earing the same data, and in the llebard Collection 

 and that of the Academy of Natural Sciences of Philadelphia, 

 are designated i)aratypes. 



