212 IIYMEXOPTERA. 



Galls are often found on the 1)laekberrv, tenanted bj' another 

 genus, DiastropliWi^ which has usually fifteen-jointed antenniv 

 in the male, and one joint less in the female. On opening a 

 gall containing this fl}^, we often find an inqniline gall-fly. 

 Aulax, "showing the most striking resemblance in size, color- 

 ing and sculpture, to the Diastrophus, their companion. The 

 one is the ver^- counterpart of the other, hardly showing any 

 differences, except the strictly generic characters." (Osten 

 Saeken.) These galls are also infested by Chalcid parasites, 

 Callimome (two species), Ormyrus, and Em-ytoma. 



Osten Saeken enumerates "■eight cynipidous galls on the dif- 

 ferent kinds of roses of this country." The flies all belong to 

 the genus Rhodites^ which is distinguished by the under side 

 of the last abdominal segment being drawn out into a long 

 point, while the antennas are fourteen-jointed 

 in both sexes. B. rosce produces the bede- 

 r/uar gall ("from the Hebrew hedeguach, said 

 to mean rose-apple"). It was formerl}" used 

 as a medicine. The galls form a moss-like 

 mass, encircling the rose branch. Rhodites 

 dichloceriis of Harris (Fig. 143), produces 

 hard, woody, irregular swellings of the branches. 



We now come to the second section, the Guest gaU-Jlies (In- 

 quilinre), Avhich are unable to produce galls themselves, as they 

 do not secrete the gall-producing poison, though possessing 

 a well developed ovipositor. Hence, like the Nomada, etc.. 

 among bees, the}- are Cuckoo-flies, lading their eggs in galls 

 already formed. 



This group may generally, according to Mr. Walsh, be dis- 

 tinguished from the preceding b}' the sheaths of the ovipositor 

 always projecting, more or less, bej'ond the "dorsal valve," 

 which is a small, hairy tubercle at the top of the seventh ab- 

 dominal segment. This dorsal valve also projects greatly. 

 In almost all the species, the ovipositor projects from between 

 the tips of the sheaths. 



Among the Inquiline genera are /Synophriis, AmbJynohis^ 

 Synerges, and Aulax, which are guests of various species of 

 C^niipides. 



In Figites and allies (Figitidas), the third section of the 



