474 
Journal of Agricultural Research 
Vol. I, No. 6 
THE ADULT 
The adult (PI. TXI, figs. 3 and 4) of Agromyza pruinosa Coq., 1 six 
specimens of which were reared by the writer in the spring of 1913, 
is closely related to Agromyza carbonaria Zett. of Europe. Agromyza 
pruinosa remains in the pupal stage in the ground during the winter 
and emerges from the pupa case in one of two ways: Either the end of 
the pupal case is pushed off completely, or emergence is accomplished 
by tearing the end of the pupal case into shreds. Of the six specimens 
just referred to five were males and one a female. This species of 
Agromyza is represented in the United States National Museum col¬ 
lection by Coquillett's type, a single male specimen (Catalogue No. 
6659, U. S. National Museum). The writer's specimens agree perfectly 
with the type, except that they are very slightly larger. ' 
The general appearance of the adult female corresponds to that of the 
male, with the exception that it is slightly more robust. The ovi¬ 
positor is slightly over one-half of a millimeter in length, chitinized, and 
somewhat shiny on the sides and edges of the dorsal surface. It is 
slightly flattened and a little broader at the apex than at the base. On 
the dorsal surface is a granular space, rounded toward the base of the 
ovipositor. 
The total length of the female is 4 mm., and of the male about 3 mm. 
The abdomen of the female is shown in figure 4 of Plate LXI. 
In an adult that had just emerged from the pupal case, the eyes were 
brownish and the frons and face a pale yellow or orange color. The 
thorax was pale gray, the legs yellowish, and the wings opaque white, 
clearing to hyaline in about two hours. The abdomen was of a dull 
orange color, with a faint gray line along the edge of each segment. 
The whole insect assumed its natural color in two and a half hours. 
A HYMENOPTEROUS PARASITE 
On May 13, 1913, a hymenopterous parasite, Sympha agromyzae 
Rohwer 2 (PI. LXI, fig. 5), issued from a pupa case of Agromyza pruinosa 
Coq. This parasite is nearly as large as its host. Apparently it deposits 
its egg within the egg of the host. The apparently normal dipterous larva 
mines down the tree trunk and enters the ground; the pupa is perfectly 
formed, outwardly exhibiting no signs of parasitism, but about the time 
the host should emerge the parasite issues instead. At maturity the end 
of the pupal case is pushed open by the parasite in the same manner as 
the host would do it. 
] Coquillett, D. W. New acalyptrate Diptera from North America. Jour. N. Y. Ent. Soc., v. 10, No. 
4, p. 177-191. Dec., 1902. “ Agromyza pruinosa , sp. nov.,” p. 1S9. 
2 "Sympha agromyzae , n, sp. Female. Length 3 mm. Notauli well defined; prescutum with afove- 
olate furrow; face sparsely punctured; propodeum with a transverse carina; hind tarsi pale. Type Cat. 
No. 16474 U. S. Nat. Mus." (S. A. Rohwer). A detailed description will appear later in the Entomo¬ 
logical News. 
