NO. 3533 CHALCID WASPS OF GENUS EURYTOMA — BUGBEE 439 



Genus Eurytoma Illiger 



Eurytoma Illiger, 1807a, p. 192.— 1807b, p. 128. 



Decaloma Spinola, 1811, p. 151. 



Ennetoma Dahlbom, 1857, p. 292. 



Enneatoma [sic] Dalla Torre, 1898, p. 332. [Emendation.] 



Bephratella Girault, 1913, p. 95. 



Type species: Chalcis abrotani Panzer (=Pt€rotnalus appendigaster) 

 Swederus, designated by Westwood, 1840. 



Female. — Varies in length from 1.5 to 7.0 mm. Color is most often 

 black; occasionally some yellow may occm* on the head, lateral 

 prothorax and mesothorax, tegiila and legs; black may be replaced by 

 deep brown in a few species. Abdomen showing seven terga not 

 counting the petiole and propodeum; rectangular, oval, or circular 

 from a lateral view with slight to extreme lateral compression; ninth 

 tergum (exposed ends of the dorsal valves of the genitalia) varies in 

 length from .06 to .45 mm; pointed and plow shaped with a prominent 

 cercus on each side; may be in line with the horizontal axis of the 

 abdomen or project dorsad with the ventral valves at a 30° to 40° 

 angle. Petiole may be longer than wide and equal in length to the 

 hind coxae or wider than long; sixth abdominal tergum usually as long 

 or longer than fourth and fifth combined ; lateral surface of sixth often 

 covered with fine reticulations that may fade out so that dorsal surface 

 is smooth and shiny, or they may extend over dorsal surface. 



Internal genitalia variable; in most species dorsal and ventral valves 

 turn dorsally, anteriorly, at less than a right angle; stylet arch is in 

 an oblique plane; dorsal extension may be so slight that stylet arch is 

 in horizontal plane in some species while in others dorsal and ventral 

 valves may turn dorsally at right angle, and the ventral valves turn 

 posteriorly forming an arc of 180°, in the latter case the stylet arch is 

 in vertical plane; width of dorsal valves may be wide for horizontal 

 length or quite narrow and may be yellow except for posterior tip or 

 black for entire length. 



Propodeum usually concave with or without a narrow to wide 

 median furrow; if furrow is lacking, surface often finely reticulate; if 

 furrow is present, lateral areas often reticulate or irregularly ridged; 

 in a few species the propodeum is rounded or sloping posteriorly, but 

 in most species it drops sharply at almost right angles to the scutellum. 



Dorsal surface of the thorax covered with umbilicate punctures; 

 parapsidal grooves on the mesothorax usually complete; broad collar- 

 like pronotum usually as wide or only slightly less than width of 

 mesonotum in dorsal view; prepectus always present. 



Head with occiput, frons, and genae covered with umbilicate 

 punctures, although in a few species punctures may be reduced or 



