506 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iis 



Rhabdophaga hatatus Walsh, R. brassicoides Osten Sacken, R. cornuta 

 Walsh, R. strobiloides Walsh, dipterous gall on Leptilon canadense, 

 galls of Euura 7iodus Walsh, E. salicis-ovulum (Dalla Torre), E. per- 

 turbans (Walsh), Nematus hospes (Walsh), Amphibolips spongifica 

 (Osten Sacken), Callirhytis seminator (Harris), Diastrophus fragariae 

 BeutenmuUer, Dryocosmus palustris (Osten Sacken), Xanthoteras 

 forticorne (Walsh), Mordellistena nigricans (Melsheimer) in gaUs of 

 Eurosta solidaginis Fitch, Euura orbitalis Norton, E. salicicola Smith, 

 Phylloxera caryae-fallax Riley, P. c.-globuli Walsh, Lasioptera solida- 

 ginis Osten Sacken. 



Eurytomid specimens from most of the above hosts were not en- 

 countered in the various collections studied so that I can vouch for 

 only those detailed following the redescription of E. studiosa. 



The majority of hosts belong to the gaU-making genera, Acraspis 

 and Andricus of the family Cynijndae. 



E. studiosa is an extremely variable, wide ranging species with a wide 

 selection of hosts. It probably contains several subspecies and might 

 be separated into two or more species. The whole complex needs 

 more detailed morphological and life-history studies so that accurate 

 host data can be secured. 



The original types of E. studiosa are believed lost. In the U.S. 

 National Museum collection are several specimens determined by 

 Ashmead as this species from Jacksonville, Fla. However, they 

 do not seem to fit the original description too well. The original 

 description is rather meager and so generalized that it could be 

 applied to any number of eurytomid species. In one respect, how- 

 ever, Say's description is quite clear — that the color of the legs (i.e., 

 femora and tibiae) is dark, except for the "whitish" tarsi. This is 

 not much to go on, but the specimens determined by Ashmead and 

 other specimens determined later by A. B. Gahan have yellow legs 

 with at the most some light-brown infuscation on the femora and 

 tibiae, as well as yellowish-brown fore- and mid coxae. Say's descrip- 

 tion also impHes that the general coloration of the species is black. 

 Many of the specimens in the collection of the U.S. National Museum 

 have brown abdomens, yellow to brownish scapes and tegulae. In 

 addition. Say's original specimens came from Indiana; and the neotype 

 specimens from Bloomfield, Ind., bred from Acraspis pezomachoides 

 on Quercus alba, seem to come closer to Say's description than any 

 other material examined. 



Ashmead (1887) lists E. lanulae Fitch, E. teredon Walker, E. pythes 

 Walker, and E. bolteri Riley as synonyms of E. studiosa. E. bolteri 

 Riley is a good species. I have been unable to check the two Walker 

 species, so they are not included. E. lanulae is represented in the 



