470 [March 
internal, it is probable that here the long 6th ventral joint (Fig. I v) 
is typically composed of two confluent joints. 
By the above arrangement the Inquilinous genera Aulax, Amblynotm, 
Sarothrus^ &c., and the gall-making genus DiastropTius will be grouped 
with Gynipiclse^ where their habits and their general appearance indi¬ 
cate that they belong. What could be more apparently unnatural, than 
to refer Diastrophm^ which makes galls on the bramble, to Figitidse, 
and Rhodltes^ which makes galls on the rose, to Oynipidm? The 
genus Ihalia^ which I do not know, will also appertain to Cytiipidse^ 
and from its pterological characters appears to belong to the true G-all- 
flies. (Latr. Gen. Cr. et Ins. lY, p. 17.) Dr. Rheinhardt forms this 
genus into a distinct family, Ibaliidae (Blanch.), because “ the segments 
of the abdomen are of equal length exclusive of course of the peduncle 
or 1st joint.” (Proc. Ent. Soc. Phila. I, p. 48.) It is remarkable 
that Westwood figures lhalia with an abdomen which, including the 
peduncle or first joint, is dorsally 6-jointed, the last joint full twice as 
long as any of the preceding. {Intr. II, p. 121, fig. 22.) From the fact 
that the dorsum of the normal Cynipidous abdomen is apparently 7-, 
not 6-jointed, though in reality it is 8-jointed, as will be shown below, 
I infer that this large terminal joint in Professor Westwood’s figure is 
in the actual living insect divided by a suture, perhaps a connate one. 
into two, and thus, as Rheinhardt asserts, the six principal dorsal 
joints of the abdomen (2—7) will become equal in length. 
I have a remarkable 9 Cynipide, forming apparently a genus inter¬ 
mediate between Cynips and lhalia.^ and thus confirming the fact that 
Ihaliidse are not a distinct family, as Dr. Rheinhardt thinks. I ob¬ 
tained it, dead and with the wings undeveloped, from an irregular mass 
of several dozen egg-shaped cells with a very smooth internal surface, 
connected by fleshy potato-like matter, and each about .17 or .18 inch 
long, the whole, as I learned from a reliable source, attached, appa¬ 
rently by a woody peduncle, to a common potato, many other such galls 
having been found on other potatoes. Numerous dead larvae, evidently 
Cynipidous, were found in the other cells, one only in each. Generi- 
cally this insect may be thus characterized :— 
Tribalia, n. g. Abdomen with its dorsum apparently 7-jointed, 
much compressed and knife-edged below; peduncle or 1st joint small; 
all the sutures between 2 and 7 free. The second dorsal joint only 
