NO. 3533 CHALCID WASPS OF GENUS EURYTOMA — BUGBEE 507 



U.S. National Museum by a single female whose characteristics fall 

 within the range of variation of E. studiosa as limited in the revision. 



73. Eurytonta spongiosa Bugbee 



Map 33 

 Eurytoma spongiosa Bugbee, 1951, pp. 254-257. — Burks, 1958, p. 82. 



Types: 44 females and 16 males; holotype female, allotype male, 

 and paratypes in the U.S. National Muesum (USNM 61236). Para- 

 types in Bugbee collection, Allegheny College, Meadville, Pa. 



Type locality: Bloomington, Ind. 



Distribution: United States: east of the Sierra Nevada mountains. 

 Canada: Sasketchewau, Ontario. 



Host: Diplolepis rosae (Linneaus), D. dichlocera (Harris), and D. 

 iuberculator (Cockerell) on Rosa species. 



Subspecies: Eurytoma spongiosa curvavena Bugbee. Description, 

 Bugbee (1951). Minnesota. Host: Diplolepis multispinosa (Gillette) 

 (USNM 61237). 



Remarks: E. spongiosa is the eiu-ytomid parasite bred from the 

 common mossy rose gall (Diplolepis rosae (Linnaeus)) on wild rose. 

 Its small oval abdomen with only slight lateral compression, short 

 sixth abdominal tergum that is about the same length as the fifth, 

 black tegula, and its weakly developed female genitalia, anteriorly, 

 with the stylet arch in a horizontal plane are distinguishing character- 

 istics in addition to those given in the key. 



71. Eurytoma obtiisa, new species 



Figure 28; Map 31 



Female: Black. Length averages 3.3 mm. (3.0-4.1). Abdomen 

 plmnp; slight lateral compression; averages 1.9 mm. (1.8-1.9) in 

 length, first segment, in lateral view, rises abruptly almost straight 

 dorsad from petiole before curving posteriorly. Sixth segment, viewed 

 laterally or dorsally longer than segments four and five together; 

 averages .74 mm. (.70-.80) in length; sculpturing on lateral surface 

 of sixth covers lower half to three-fourths then recedes anteriorly; 

 does not extend over dorsal surface; ninth abdominal segment short 

 and stubby, averaging .13 mm. (.12-. 15) in length; fringe of hairs 

 limited to tip and along ventral margin, covering posterior third to 

 quarter of segment; rest naked; cercus close to ventral margin and 

 oval in outline. Internal genitalia averages 1.7 mm. (1.6-1.8) in 

 length, .97 mm. (.95-1.0) in height, and anterior expanded plate of 

 ventral valves averages .18 mm. (.17-.20) in width at widest point; 

 whole structure short but sturdy; dorsal valves wide for horizontal 

 length except just anterior to exposed tips; dorsal and ventral valves 

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



