402 
The Ohio Naturalist. 
[Vol. XII, No. 1, 
Paragus tibialis (Fallen). 
Larva. 
Length about 7.5 mm., width 2 to 2.5 mm., height 1.5 mm. 
Similar in superficial appearance to the previously described 
Paragus bicolor but slenderer and smaller. Color markings 
variable. Ususally the heart line is rather prominent as is also a 
similar looking dark line along each side of the body about under 
the dorsal segmental spines. The reddish color is of much less 
extent than in P. bicolor and is largely replaced by a sulphur 
yellow tinge. In some specimens the general color is uniform light 
yellowish brown. The segmental spines are shorter and situated 
on smaller conical elevations than those of P. bicolor (Fig. 32), 
but the dorsal one in segments 6 to 11 is less reduced proportion- 
ately, being about one-third as long as the median and dorso- 
lateral ones. (See Fig. 31). 
The most convenient means of separation of the two species 
in the larval stage is in the length of the posterior breathing 
appendage. This in P. tibialis ranges from about 0.4 mm. to 
0.65 or 0.7 mm., until an average of about 0.5 mm. as compared 
with P. bicolor where the length is near 0.3 mm. The width at 
the tip is about 0.25 to 0.3 mm. as in P. bicolor. The appendage 
besides being distinctly longer is somewhat more bifurcate at the 
tip in P. tibialis and the general surface is slightly more depressed 
between the spiracular elevations. This will be made clearer by 
reference to Figs. 25, 26, 33 and 34. 
Larvae were taken from common Burdock (Arctium minus 
Schk.) at Lakeville, Ohio, June 21st; at Sandusky, Ohio, from 
July 30 to August 5; and at Kelley’s Island, July 8th. They 
were found on the upper, but chiefly on the lower side of the 
leaves of Burdock parasitic in colonies of aphids (species unde- 
termined) the body fluids and viscera of which they devour in 
the usual manner. 
They were found parasitized to a slight extent by the 
liymenopteron Bassus sp. 
Pupa. 
Dimensions, average of five: length 4.3 mm., width 1.8 mm., 
height 1.75 mm. Nicely rounded out anteriorly and dorsally, 
flattened to the surface of the leaf ventrally and attenuated 
strongly to the posterior respiratory appendage both by depression 
and by compression (Fig. 35). The posterior appendage is very 
frequently turned to one side or other from the middle line. 
General color uniform pale brown to darker, the six spiracular 
elevations black. 
Compared with P. bicolor the puparium is less rounded up 
posteriorly, more attenuated (Fig. 35, cf. Fig. 28). The characters 
•of the posterior, breathing appendage and the segmental spines 
