Holotype: "Male holotype from Fruita, Utah, July 17, 1931 (W.J. Gertsch), in the American Museum of Natural History. Paratypes in the United States National Museum and the Museum of Comparative Zoology" (Muma, 1951, p. 108).
Chelicerae Description: "Dentition variable but following general pattern shown in figure 217. Movable finger with principal tooth large, anterior tooth an indistinct ridge, two intermediate teeth, of which the distal is often minute or missing, and no mesal tooth. Fixed finger needle-like, hooked downward at the tip, and with two large and two or more minute aborted teeth at the base. Fondal teeth occurring in two rows of four each which are graded in size I, III, II, IV. Fourth fondal teeth scarcely distinguishable from dentate socket margin of movable finger. Fondal notch obscure but bearing two of the aborted teeth of the fixed finger" (Muma, 1951, p. 108).
Chelicerae Setae Description: "Flagellum complex typical of group. Striate bristles fine, weakly striate, and extending nearly parallel with finger. Plumose setae weakly plumose except for the three most apical which are distinctly so. Mesal setae of movable finger plumose on basal half of articulation area, simple apically" (Muma, 1951, p. 108).
Ctenidia Description: "First post-spiracular abdominal sternite provided with four short, stout, needle-like ctenidia of which the outer pair is longest" (Muma, 1951, p. 108).
Diagnosis: Records of this species are found in the following:
California: San Francisco, consisting of one male. Wyoming: near Laramie, on June 15, 1941, of two males (Jellison and Svehld) (Muma, 1951).
Hemerotrecha fruitana – male holotype AMNH
Fruita, Utah, July 17, 1931; coll., W.J. Gertsch
(All measurements in sp description except papillae segments)
Measurements:
| Char | Char description | M (mm) |
| CL | chelicerae length | 2.7-3.2 |
| CH | Chelcera height | 1.1-1.4 |
| FNL | Fondal notch length | |
| FNH | Fondal notch height | |
| FFH | Fixed finger height | |
| LI | First leg length | 9.0-10.0 |
| LIV | Fourth leg length | 16.0-17.0 |
| PPL | Propeltidium length | 1.6-1.9 |
| PPW | Propeltidium width (from bottom edge where “ears” begin) | 1.9-2.3 |
| PL | Palpus length | 12.0-13.0 |
| PMT | Palpal metatarsus length | 3.03 |
| PT | Palpal tarsal length | 0.75 |
| TL | Total length | 12.0-15.0 |
Notes:
There is one type specimen (male) in the vial but there are THREE separated chelicerae! All appear to be from the same species, but clearly an additional jaw .
Abdomen in poor shape. No visible ctenidia but there may be two attachment points for ctenidia (no photo).
Palp quite dark (photo); no papillae.
