SUBTERRANEAN AMPHIPOD STYGONECTES 61 



only North American species of the Crangonyx section with the second 

 antenna longer than the first antenna in either sex. 



Type locality. — Wells at Middletown, Middlesex Co., Conn. No 

 other data are available on the type locality. 



Distribution and ecology. — S. t. tenuis occurs in shallow sub- 

 terranean waters of the southern New England Upland section of the 

 New England province south to New York City and then again in the 

 eastern Coastal Plain on the Maryland peninsula. The large gap in 

 range of this subspecies may be due to lack of collections rather than 

 absence of populations over the 150 mile expanse between Talbot Co., 

 Md., and New York City, Collections of this subspecies have been 

 made from shallow wells (the majority), spring outlets (1 record) and 

 from a ditch, the latter of which was probably fed by underground 

 seepage. Populations on the Maryland peninsula apparently occupy 

 shallow interstices in unconsolidated Pleistocene sand and gravel 

 deposits. Those in New England and New York occur in shallow 

 ground waters of Precambrian crystalline rocks. 



Two of the females collected from Talbot County during August 

 and October were ovigerous. An 8.25 mm female had 18 eggs in the 

 brood pouch in the August collection and a female collected during 

 October was carrying several young. One 5.50 mm female from 

 WestvUle, Conn. (Dec. collection) had well-developed brood plates 

 but was not ovigerous. 



Remarks. — Smith (1874) did not specify a type locality nor desig- 

 nate a type, but from his comments it can be assumed that the origmal 

 description of this species was based on material collected from wells 

 at Middletown, Conn. Kunkel (1918) redescribed this species and 

 included a figure, presumably based on the original material of S. I. 

 Smith. Through the courtesy of Dr. W. D. Hartman of Yale Uni- 

 versity, I was able to borrow material from the Peabody Museum of 

 Natural History labelled "Crangonyx tenuis from Middletown, Con- 

 necticut." No further data were given on the label, but there is little 

 doubt that this is the material on which Smith based his original 

 description and on which Kunkel based his subsequent drawings. 

 Since no type was originally designated, I have designated one of the 

 males (12.00 mm in length) as the lectotype. Although certain parts 

 of both the lectotype and syntype have been lost as a result of several 

 examinations over the past years, when studied together, enough of 

 the structures are still present and intact that recognition of diagnostic 

 characters is possible. 



Kunkel (1918) also indicated that S. tenuis had been found at Ca- 

 naan, Conn., and under stones in a small brook near New Haven, 

 Conn. I have not been able to locate either of these two collections 



