192 SEVENTEENTH Report STATE ENTOMOLOGIST OF MINNESoTA—1918 
RUCHARIDAE 
Same as Perilampidae, but stigmal vein not developed, and second abdominal seg- 
ment very large, inclosing other segments. Ovipositor well forward, 
In members of this 
family, the structure of 
the thorax, particularly 
of the scutellum, is most 
curiously modified. This 
modification with the 
brillant metallic blue 
and -green colorme 
which characterizes the 
members of the family, 
make it perhaps the 
most striking group of 
Vig. 75. Pseudometegia sp. dorsal and side view. the superfamily. Some, 
or all, attack ants and 
are particularly abundant in tropical countries where ants abound. 
Fig. 75 illustrates a species found in Minnesota. 
CHAECIDIDAE 
Antennae elbowed and with f 
one, two or three ring joints, i 
very rarely without ring joints; 
tarsi 4 or 5-jointed, fore tibiae 
armed with a large curved spur, 
hind tibiae with two apical 
spurs; hind femora much _ swol- 
len; fore wings never folded ; ovi- 
positor rarely prominent, not 
curved over dorsum of abdomen. 
Abdomen most frequently con- 
ical or conie ovate, more rarely 
globose or oblong. 
Strongly typical of the 
suborder and _ containing 
a large number of useful 
parasites: At least:vone 
species is a secondary para- 
site on parasites working 
Fig. 76. Phasgonophora sulceata Westw. 
on Lepidoptera larvae. 
The minute and interesting chalcid Podagrion (Palmon) pachy- 
menes is said to shelter itself under the wings of a species of Mantis 
