AST. 19. GAIIiFLIES OF THE FAMILY CYNIPIDAE — WELD. 5 



galls were very abundant in October, 1917, many trees having a dozen 

 or two underneath. At that date some of the galls contained pupae. 

 Adults and full-grown larvae were found inside the next January 

 and one emerged May 25, 1918. Transformation thus takes place in 

 the fall and emergence the next spring. The emergence begins the 

 first spring after the galls drop and is distributed over at least two 

 seasons. 



AMPHIBOUPS PRUNUS (Walsh). 



Plate 1, fig. 2. 



These galls have been seen by the writer on Q. rubra at Kilbourn, 

 Wisconsin ; Porter, Indiana ; and Ironton, Missouri. Like the others, 

 transformation takes place in the fall and emergence in the spring, 

 distributed over more than one season. Similar galls occur on various 

 red oaks, and only by rearing the adults can it be determined whether 

 they are all formed by this species or whether several species are in- 

 volved. Illinois is the type locality, but until material reared from 

 various oaks is at hand the host source of the type fly is in some doubt. 



Genus BIORHIZA Westwood. 



BIORHIZA ELDGRADENSIS (Beutenmueller) . 



Plate 3, fig. 10. 



A7^driC4iS eldoradensis Bkutenmueller, Bull. Brooklyn Ent. Soc., vol. 8, 

 1913, p. 105, fig. 12.— Fext, Key to Amer. Ins. Galls, N. Y. St. Mus., Bull. 

 200. 1918, p. 118. 



This Californian species was described from males only and the 

 type and a paratype male are in the United States National Museum. 

 They are from Los Angeles and bear the Koebele number 109 in red 

 ink. Eecentlj'^ a series of 31 additional specimens (11 males and 20 

 females) was discovered in the museum, all with the same Koebele 

 number 109 and from Sonoma County. The author also has 6 males 

 and 5 females reared in September from galls in wisUseni acorns, 

 which he collected at Santa Margarita on August 13, 1916. Both sets 

 of males agree with the types of eldoradensis, and the female of the 

 species is here described for the first time. As the mesoscutum is 

 smooth and shining, the parapsides percurrent, second segment of 

 hind tarsus shorter than fifth and the third antennal segment of the 

 male is emar'ginate, the species is here transferred to the genus Bior- 

 hiza. 



Female. — Pale buff to honey-yellow, propodeum often darker, ab- 

 domen reddish brown, almost black posteriorly. Head coriaceous; 

 seen from above axial line .56 width of head with cheeks widened be- 

 hind and longer than eyes, face from in front elliptical, widest op- 



