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AMCS Bulletin 5 Reprintresented by only two; tufts of setae near distal extremityof finger more conspicuous than in holotype;opposable margin of dactyl with row of 18 tubercles;carpus of cheliped lacking enlarged tubercle on dorsalmesiodistal margin; merus with mesial row of 20 tuberclesmuch larger than those of lateral row. (Seemeasurements, particularly those of chelae).Annulus ventralis (Fig. 31) with median troughcephalically; sinus originating at caudal extremity oftrough, curving sharply dextrally before turning caudosinistrally,and cutting caudal margin of annulusslightly sinistral to median line. Preannular plate withmedian longitudinal trough, lateral swollen areas withmany short stiff setae, comparatively few in trough.Postannular plate almost as wide as annulus and morethan one-half as long; surface not strikingly orna·mented. First pleopod rudimentary.Morphotypic Male, Form II-Differing from holotypein following respects: palm of chela with mesialrow of 15 tubercles; opposable margin of fixed fingerwith 15 tubercles in dorsal row and three in ventral;opposable margin of dactyl with row of 26 tubercles;carpus without enlarged tubercle on dorsal mesiodistalmargin; merus with ventromesial row of 18tubercles conspicuously larger than those in lateralrow of 21; hook on ischium of thirdpereiopod lessacute and shorter than those in holotype, not extendingproximally so far as distal extremity of basis;tuberculiform prominence on coxa of fifth pereiopodalmost as well developed as in holotype.First pleopods (Fig. 3c,g) with cephalodistal extremityof shoulder more truncate than in holotype;mesial process less acute and not bent so stronglylaterally; central projection non-corneous and decidedlymore bulbous.Size-The largest specimen available is a femalewith a carapace length of 30.9 mm (postorbital length25.4 mm). The largest and smallest first form maleshave corresponding lengths of 30.8 (25.4) mm and25.5 (20.8) mm,Type-localitY-Cueva del Guano, 10 km NE ValleNacional, Oax~ca, Mexico. The specimens were collectedon 28 December ,.972 by J. R. Reddell, D.McKenzie, M. M~Kenzie, and S. Murphy.Types-The h~lotypic male, form I, allotypic female,and morphotypic male, form II (Nos. 144341,144342 and 144343, respectively) are deposited togetherwith one paratypic male, form I, and 4 paratypicfemales, in the National Museum of NaturalHistory, Smithsonian Institution. Two series of paratypes,each consisting of 1 male, form I, and 2 females,are deposited in the Instituto de Biologl1l,Universidad Nacional Autonoma de Mexico, and inThe Museum, Texas Tech University, Lubbock, Texas.Range and Specimens Examined-Procambarus(Austrocambarus) o. oaxacae is known only from thetype-locality, and the 14 specimens available are allassigned to the type-series. Associated with this crayfishare two entocytherid ostracods: Entocythereclaytonhoffi Rioja and Ankylocythere maya Hobbs.Variations-The variations noted are primarilythose associated with injury and regeneration. Slightdifferences occur in the numbers of tubercles on thevarious podomeres of the chelipeds, but none ismarkedly different from those cited in the abovedescriptions. Variations are rather marked in theamount of pigment and the size of the pigmentedarea in the eye. In one specimen, there is not a traceof any pigment; all of the others, however, have adiffusely pigmented spot with concentrations seeminglylimited to a few omatidia. There are also slightvariations in the sculpture of the annulus ventralisand the pre- and postannular plates with excavationsand prominences more prominent in larger specimens.Relationships-See the discussion of relationshipsof Procambarus (A.) o. reddelli.Procambarus (Austrocambarus) oaxacae reddelli,new subspeciesFigs. 6, 7, 8Diagnosis-Body without pigment or with tan suffusionon abdomen; eyes reduced in size, but withsmall distinct black pigmented faceted area. Rostrumwith marginal spines. Areola 3.4 to 5.3 times longerthan broad, constituting 33.2 to 35.7 percent oftotal length of carapace (42.0 to 44.4 percent ofpostorbital length), and with seven to nine punctationsacross narrowest part. Cervical spine present,often small and occasionally absent on one side.Hepatic region lacking spine on cephalic margin. Suborbitalangle obsolete. Postorbital ridge provided withwell developed spine. Antennal scale approximatelytwice as long as wide, broadest distinctly distal tomidlength. Mesial surface of palm of chela with irregularrow of approximately 20 tubercles, and bothfingers with longitudinal ridges dorsally and ventrally.First pleopod with shoulder on cephalic surface convexdistally; distal extremity of appendage bearingterminal elements markedly similar to those of P. (A.)oaxacae oaxacae. Annulus ventralis and accompanyingsternites as figured (Fig. 8/).Holotypic Male, Form I-Body subovate (Fig. 8a,k)compressed laterally. Abdomen narrower than thorax(14.1 and 16.4 mm). Width of carapace slightly greaterthan height at caudodorsal margin of cervical33