Holotype: "Female holotype from a dry hillside near El Paso, El Paso County, Texas, on March 20, 1960 (Gertsch, Ivie, Schrammel)" (Muma, 1962, p. 39).
Chelicerae Description: "Dentition (fig. 74) similar to that of H. milsteadi, except there are two intermediate teeth between principal and medial teeth of fixed finger, several denticules in front of anterior teeth of both fingers, and fondal teeth of both rows are graded in size I, III, II, IV" (Muma, 1962, p. 39).
Ctenidia Description: "Structure also similar to that of H. milsteadi, except there are four trace ctenidia on the first post-stigmatic abdominal sternite" (Muma, 1962, p. 39).
Diagnosis: "The opercula of this species are distinctive, and the fondal tooth formulas agree with those of H. branchi Muma. The species is tentatively placed in the branchi group of the genus, although other species of the group have two instead of four ctenidia and the opercula juvenile in appearance...opercula as in figure 75" (Muma, 1962, p. 39).
Hemerotrecha elpasoensis –female holotype AMNH
TEXAS, El Paso, El Paso Co.; Mar 20, 1960; coll., W.J. Gertsch, Ivie & Schrammel; dry hillside & trash pile.
(All measurements in sp description except papillae segments)
Measurements:
| Char | Char description | M (mm) |
| CL | chelicerae length | 3.8 |
| CH | Chelcera height | 1.5 |
| FNL | Fondal notch length | |
| FNH | Fondal notch height | |
| FFH | Fixed finger height | |
| LI | First leg length | 9.5 |
| LIV | Fourth leg length | 15.5 |
| PPL | Propeltidium length | 1.7 |
| PPW | Propeltidium width (from bottom edge where “ears” begin) | 2.4 |
| PL | Palpus length | 12.0 |
| PMT | Palpal metatarsus length | 3.12 |
| PT | Palpal tarsal length | 0.78 |
| TL | Total length | 16.0 |
Notes:
Type specimen totally torn into pieces. Can only find one chelicerae.
Palp dark through 1st ¼ femur (photo).
