SUBTERRANEAN AMPHIPOD STYGONECTES 71 



9.00 mm (Mean = 6.98, S.D. = 0.97). Egg production is simimarized 

 as follows: N = 25, Eange=3-10 eggs, Mean = 6.60, S.D. = 2.G0, 

 C.V. = 30.0%. 



Remarks. — The collections from Johnson (Upper) Cave, Centre 

 Co., and Barton and Dulany Caves, Fayette Co., referred to S. pizzinii 

 by Shoemaker (1938, 1942a); and the records for S. pizzinii from 

 Barton and Dulany Caves and Veiled Lady Cave, Centre Co., given 

 by Dearolf (1941) undoubtedly belong to the species described above. 

 The Pennsylvania localities for Synpleonia hayi (e.g.. Veiled Lady 

 Cave) and Synpleonia species (e.g.. Barton and Dulany Caves) listed 

 by Dearolf (1941), and for S. hayi (e.g., Barton and Dulany Caves) by 

 Hubricht (1943) are all doubtless assignable to S. allegheniensis . I 

 have examined the collections from Johnson (Upper) Cave and Veiled 

 Lady Cave, mentioned above, and additional material from Barton 

 Cave and found all of it conspecific with S. allegheniensis as presently 

 understood. Collections from Penns Cave and Dulany Cave could 

 not be located either in the U.S. National Museum nor in the L. 

 Hubricht collection, but these two caves fall well within the range for 

 *S'. allegheniensis and far out of the known range of *S'. haxji and S. 

 pizzinii as delimited in this paper. Penns Cave is now partially 

 flooded and open to the public as a tourist attraction. Li May 1965, 

 I visited Dulany Cave (now open commercially under the name of 

 Laurel Caverns) and searched its extensive stream system for over 

 two hours but was unable to find any amphipods. An extensive 

 search in nearby Barton Cave and Barton Cave Spring yielded many 

 Gammarus but no Stygonectes. 



This species may be expected in the Appalachian Plateau of north- 

 central Pennsylvania, and the absence of records there to date is prob- 

 ably due to lack of intensive collecting. Since this area is underlain 

 by noncavernous bedrock, future collecting must be focused on seeps, 

 springs, and wells. 



Stygonectes hayi (Hubricht and Mackin), new combination 



Figure 17 



Synpleonia hayi Hubricht and Mackin, 1940, p. 205, iig. 11 [Type locality: small 

 spring, south end of the National Zoological Park, Washington, D.C.]. — 

 Barnard, 1958, p. 74.— Hubricht, 1959, p. 878 (in part) .—Nicholas, 1960, 

 p. 130 (in part), [Not Dearolf, 1941, p. 171, or Hubricht, 1943, p. 709.] 



Material examined 

 WASHINGTON, D.C. — Spring, south end of National Zoological Park, 10 cotypes 

 (syntypes), L. Hubricht, Mar. 9, 1938 (USNM 77804); 3 male, 4 female, and 2 

 juvenile paratypes, same date (LH, and 2 slide mounts in JRH). 



Diagnosis. — Medium-sized interstitial species distinguished from 

 the two previously described species by more convex posterior margins 

 of pereopod 5-7 bases, more spinose 1st uropod in the female, and 



