Hypselonotus punctiventris. The pale band of the corium is triangular. More Austin is pretty far in North. See the description of H.punctiventris and the description,comments and distribution map for H.lineatus on (1) (don't confuse with H.linea].
While I think is not imposible that the H.lineatus to reach the North of Rio Grande, I suspect that the clear triangular shape of the preapical corium band can be use to narrow the specimens at least from our area to the H.punctiventris and rule out H.lineatus. (If a side view or a ventral view are not available, to confirm the presence of the rows of spots on the ventral of the abdomen.)
You can compare the corium band of H.punctiventris and H.lineatus here and here
More, to note that in (1) the H.lineatus is not mentioned for North of Rio Grande.

Until now I found only one mention for H.lineatus in Texas (a report from 1931) here
http://coreoidea.speciesfile.org/Common/basic/Taxa.aspx?TaxonNameID=1189976
(I search to see if I can find the text available on net for this report, but I didn't find yet.)
But and in this case the distribution is shown to have a limit on Rio Grande. (see the map).