1888.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 661 



lG-joint, black, the joints of the tiagell'im are about two and a half times 

 longer than thick, the terminal joint being longer and stouter; thorax 

 smooth, polished, the upper margin of collar, triangular piece in front of 

 the tegula?, and the tegulre piceous or brownish ; metathorax smooth, 

 distinctly areolated ; abdomen as usual, long, lanceolate, about twice as 

 long as the thorax; the petiole about twice as long as wide, with prom- 

 inent tubercles. Wings hyaline; stigma and veins pale, the basal 

 nervure brown ; the 2d branch of the radius is not as long as the trans- 

 verse cubital nervure, the latter being hyaline. 



The male has 19-jointed anteuure, the metathorax piceous, the 1st and 

 2d abdominal sutures only pale, while the veins of anterior wings are a 

 little darker, and the 2d branch of the radius is, at least, as long as the 

 transverse cubital. 



Habitat— Lafayette, Indiana. 



Described from two specimens, one male and one female, labeled No. 

 83 7 , received from Mr. F. M. Webster. 



Aphidius xanthus n. sp. 



Male.— Length, If"" 1 '. Honey-yellow, smooth, polished; head black, 

 disk of mesonotum obfuscated or brownish; auteuure 19-jointed (?); tho- 

 rax with parapsidal grooves anteriorly which become obsolete before 

 attaining the middle of mesonotum ; metathorax smooth, polished, not 

 areolated; abdomen longer than the head and thorax together; the 

 petiole about thrice as long as wide and of a uniform thickness through- 

 out, the spiracles not prominent ; wings hyaline ; veins pale brown, sub- 

 hyaline; the 2d branch of the radius is about as long as the transverse 

 cubital nervure. 



Habitat.— Bushberg. Mo. 



Described from a single specimen in Riley collection, labeled Xo. 

 70UP 01 , reared September 23, 187G, from a seed-pod-shaped gall on Soli- 



dago. . 



From this gall were also reared Cecidomyious flies, audit is indicated 

 in Professor Riley's " Note Book" as a Cecidomyid gall, but the rearing 

 of this parasite would, however, seem to indicate that the gall was 

 Aphidian and that the Aphidius and the Cecidomyia were true parasites. 



I have reared Ceciclomi/iw from Aphids in Florida, Mr. James Flet- 

 cher from Aphids in Canada, and several instances of such reanngs 

 are recorded abroad. 



Aphidius pallidus n. sp. 



Female.— Length, 2'"-. Smooth, polished; head black, face piceous; 

 thorax, legs, and abdomen, pale yellow-ferruginous, the dorsum of 

 mesonotum piceous black, the dorsum of abdomen pale brownish The 

 antenna are 17-joiuted, black, the two basal joints pale beneath; the 

 joints of the flagellum are hardly thrice as long as thick ; metathorax 

 areolated; abdomen normal; the petiole is yellowish-white, about twice 

 as long as wide, slightly narrowed basally, the spiracles distinct, but 





