470 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lis 



sionally slight brownish infuscation on hindfemora and some black on 

 forecoxae. Average 2.9 mm. (2.4-3.2) in length. Abdomen longer 

 than head and thorax combined; averaging 1.9 mm, (1.4-2.1) in 

 length; laterally compressed so that greatest width in cross section is in 

 uper thu'd; sixth segment as long as three, four, and five combined; 

 its lateral surface heavily scidptured for lower three-quarters but 

 dorsal sm'face smooth and shiny; ninth tergum long and pointed; 

 averaging .35 mm. (.25-.40) in length; cercus about middle of length. 

 Internal genitalia averages 2.1 mm. (2.0-2.2) in length and 1.2 mm. 

 (1.1-1.3) in height; ventral and dorsal valves turn dorsally, anteriorly 

 at approximately a right angle; broadened dorsal extension of ventral 

 valves measures .25 mm. at widest part; dorsal valves narrow for 

 horizontal length and yellow in color except for exposed black tip; 

 stylet arch in an oblique plane; length of genitalia averages slightly 

 longer than abdomen because of elongate ninth tergum. Propodeum 

 with a wide concavity marked laterally by lateral carinae that may be 

 complete to base or fade out in lower third; center of concavity finely 

 punctate and with two or three short, incomplete carinae extending 

 toward center from lateral carinae; lateral areas narrow and present 

 in upper half only. Lateral ocelli large and approximately equal in 

 diameter to length of ocellocular line. Antenna with seven segmented 

 flagellum, fu'st five segments longer than wide, truncate, moniliform; 

 sixth separated from terminal unit of two closely fused segments by a 

 distinct annulation. Wing veins light yellow, linear; postmarginal 

 vein short, averaging .12 mm. (.10-. 15); marginal vein averaging .35 

 mm. (.25-.40) or approximately three times the length of the post- 

 marginal. 



Male: Length 2.3 mm. Color much as in the female; may be black 

 infuscation on hindfemora and hindcoxae; rest of legs yellow. Antenna 

 with four longer than wide, pedicellate segments ; fifth segment without 

 pedicle but separated from six by an annulation; seven and eight 

 closely fused; two whorls of long hairs on two, three, and four. Mar- 

 ginal and postmarginal veins with same relationships as in the female. 



Types: 9 females and 7 males. Holotype female and paratypes in 

 the collection of the Department of Agriculture, Ottawa, Canada. 

 Paratypes in the Bugbee collection, Allegheny College, Meadville, 

 Pa. Paratype series dated as follows: 1 female, May 10; 4 females. 

 May 14; 1 female, May 15; 1 female, May 18; 1 female. May 25; 

 2 males, May 5; 2 males. May 8; 3 males. May 9, 1951. 



Type locahty: Clemson, S.C., May 14, 1951, W. Mason. 



Distribution: Known only from the type locality. 



Host: From gall on Nyssa sylvatica. Host gallmaker not stated. 



Remarks: This species seems most closely related to Eurytoma 

 contractura, new species, E. discordans, and E. acuta. They aU have 



