476 PROCEEDINGS OF THE NATIONAL MUSEUM vol. us 



Host: Phytophaga celtiphylla Felt on Celtis species, C. mississippi- 

 ensis and C. laevigata. 



Remarks : This species runs generally smaller in all its measurements 

 than Eurytoma prunicola. In addition, the dorsal valves of the female 

 genitalia are broad in contrast to the narrow valves of the preceding 

 species and the postmarginal vein is about 80% the length of the 

 marginal instead of nearer 50%. 



37. Eurytoma lacunae, new species 



Map 18 



Female: Mostly black. Averages 2.2 mm. (2.0-2.3) in length. 

 Abdomen averages 1.1 mm. (1.0-1.2) in length; oval in outline from 

 a lateral and dorsal view; dark brown to black in color; sixth tergum 

 fully two-fifths to one-half the length of the abdomen; its surface both 

 dorsally and laterally covered by fine sculpturing; ninth tergum 

 averages .17 mm. (.15-.20) in length. Internal genitalia average 

 1.0 mm. in length and .62 mm. in height; thus the height is slightly 

 more than one-haK the length; dorsal valves narrow for horizontal 

 length and turn dorsally, anteriorly, at a right angle; stylet arch in 

 an oblique plane; dorsal valves yellowish brown except for exposed 

 distal tip wliich is black. Propodeum with a wide, shallow depression 

 without any median furrow or distinct lateral areas; surface covered 

 with irregular, fine punctations except for several larger pits dorso- 

 laterally. Tegula yellow. Face with prominent striae from below 

 eye and base of antennae that converge upon the clypeus. Antenna 

 with yellow scape and yellow to light-brown flagellum; funicle five 

 jointed; the first joint longer than wide, the rest becoming shorter, 

 so that number five is about as long as wide; terminal unit of three 

 closely fused segments. Legs including the fore- and midcoxae yellow; 

 hindcoxae may have brown infuscation mixed with the yellow. Wing 

 veins light yellow and linear; marginal vein, which averages .24 mm. 

 (.22-.25), is twice the length of the postmarginal, which averages 

 .12 mm. (.10-.12). 



Male: Black. Averages 1.3 mm. in length. Legs all yellow 

 except brownish infuscation on middle of hindfemora. Tegula yellow. 

 Scape and flagellum of antenna yellow to yellowish brown; funicle 

 consists of only four elongate, pedicellate jomts; terminal imit of 

 two closely fused joints separated from the fifth by an annulation. 

 Wing veins yellow with the same length relationships as in the female. 



Types: Holotype female, allotype, and paratypes in the U.S. 

 National Museum (USNM 66055); paratypes in the Bugbee collec- 

 tion, Meadville, Pa. 



