. Bulletin - United States National Museum. a of the Crangonyx section of Gammaridae Undescribed species Habitat in Num- Totaldescribed ber of species Genus Esti- Sub- species In prep- mate on out- terran- Epi- in aration prelim- side ean or gean or press inarystudy inter-stitial Apocrangonyx 2 5 X Crangonyx 18 10 6 X X Bactrurus 3 X Stygobromus 10 15 1 X Slygonectes 8 21 1 X Synurella 4 14 X X Total 45 21 31 20 1 —North America. As indicated earlier, the six representative North American generaof the Crangonyx section (excluding the Caribbean genera) arelisted and broken
. Bulletin - United States National Museum. a of the Crangonyx section of Gammaridae Undescribed species Habitat in Num- Totaldescribed ber of species Genus Esti- Sub- species In prep- mate on out- terran- Epi- in aration prelim- side ean or gean or press inarystudy inter-stitial Apocrangonyx 2 5 X Crangonyx 18 10 6 X X Bactrurus 3 X Stygobromus 10 15 1 X Slygonectes 8 21 1 X Synurella 4 14 X X Total 45 21 31 20 1 —North America. As indicated earlier, the six representative North American generaof the Crangonyx section (excluding the Caribbean genera) arelisted and broken down into numbers of species, respectively, intable 1. At present a total of 17 or 18 recognized genera are assignedto this section, many of which are still poorly known and needredefinition. Although the rather unique. North American endemicgenus Allocrangonyx was assigned to the Crangonyx section by bothSchellenberg and Shoemaker, in my opinion its affinities with thisgroup are unclear, and the inclusion of this genus in the Crangonyx. Figure 1.—Preserved specimen of Stygonectes reddelli ilolsinger from Whiteface Cave,San Saba Co., Tex. This female is one of 5 paratypes collected in February 1964, froma small stream in the type locality. Natural size= mm. [Photograph by RogerW. Barbour and the writer.] SUBTERRANEAN AMPHTPOD STYGONECTES 17 section is cuiTently held in abeyance pending a planned genericrevision. Genus Stygonectes Hay Figure 1 Stygonectes Hay, 1903, p. 430. [Type species, by original designation, Crangonyx flagellalus Benedict, 1896.]Synplconia Creaser, 1934, p. 1. [Type species, by monotypy, Synpleonia clantoni Greaser, 1934.] Diagnosis.—Without eyes or pigment; known only from sub-terranean and interstitial habitats. Size of sexually mature adultsranging from about mm to mm. Antenna 1: longer thanantenna 2, with exception of S. tenuis (Smith) in which antenna 2 exceeds length of antenna 1 in larger males; ranging in length fromless than
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