484 
The Ohio Naturalist. 
[Vol. XII, No. 5, 
“ $ . Length 6 mm. Head, thorax, base and tip of abdomen, 
hind tarsi, base and lower middle of hind tibiae black; four anterior 
legs, posterior coxae, femora, and often tips of tibiae, tip of abdom- 
inal segment 1, whole of 2 and 3 and more or less of 4, rufous; 
anterior orbits, mouth, tegulae, spot in front, line beneath, cunei- 
form spots on mesonotum, scutellum, post-scutellum, and band 
on posterior tibiae white. 
c? — Differs only in having the face, scape beneath and a stripe 
on pleura yellowish white. ” 
As previously pointed out for Paragus bicolor (l. c.) the pres- 
ence of the parasite is usually indicated at the time of pupation by 
a failure of the puparium to inflate completely anteriorly and 
dorsally, and retract on the ventral side, and also by its darker 
color. The following are the average dimensions of 15 puparia 
from which Bassus laetatorius had emerged: length 6 mm., height 
2.25 mm., width 2.45 mm. Compared with the dimensions of 
an equal number of unparasitized individuals as given below, it 
w'ill be seen that these are slightly less in all dimensions than the 
normal ones, with a little more difference in height than in length 
or width. The difference in shape is more • conspicuous than 
these figures would indicate (See Fig. 56) and together with the 
difference in color makes them rather easy to distinguish when 
once the characteristics are learned. 
As suggested in the previous paper it ought to be easy to 
accomplish a great deal of good by destroying these parasitized 
puparia before the parasite emerges. 
Puparium. 
Dimensions, average of 15: length 6.5 mm., height 2.5 mm., 
width 2.6 mm. (Fig. 55). Pupation occurs within the indurated 
larval skin after shortening and dorsal and lateral inflation espec- 
ially at the anterior end. The head segments are retracted 
ventrally so that segments 3 to 5 lie at the anterior pole and the tip 
of the mouth-parts (terminal in the larva) are about (1.5 cm., back 
on the ventral side. The wrinkling of the skin, characteristic in 
the larva is largely lost, due to the inflation. The vestiture 
remains as in the larva, the segmental spines inconspicuous, but 
the exposed parts of the wrinkles of the larva, densely covered 
with very small, short, sharp, black spines. Sometimes this gives 
a rather prominent transverse banding of black where the spines 
are thickest. 
The posterior three segments are proportionately less inflated 
than the middle ones. Shape from dorsal aspect ovate with the 
last segment and its respiratory appendage projecting; very 
slightly broadest in front of the middle, nicely rounded out in 
front. From the side (Fig. 56) the anterior and dorsal inflation 
