48o The Ohio Naturalist. [Vol. XII, No. 5, 



a small rounded mass; runs in a narrow median line back to seg- 

 ment 5 ; forks around the first division of the heart Hne ; and thence 

 the forks extend as broader and broader lines to the posterior end 

 of the body. In each segment back of 5 these forks are connected 

 by a whitish bar, already mentioned, just beneath the two median 

 segmental bristles; and more or less by scattered brownish globules 

 between the dorsal segmental bristles. 



These bundles of fat, and consequently the amount of brown 

 color, vary considerably in extent in different individuals, or at 

 different times in the same individual. Frequently they cover the 

 entire dorsum except the blood-vessel in segments 10, 11, 12. 

 Usually anterior to this the black body-fluid appears again next 

 the surface in the lateral pockets, already described, entirely 

 surrounded and somewhat interrupted by the adipose mass. The 

 sides of the body appear yellowish white. 



When magnified the entire dorsum of the larva is seen to be 

 covered with short, close set black spines. The segmental bristles 

 are larger, but light in color and not conspicuous, about equal in 

 size, situated on slight elevations. Ten of the body segments 

 show twelve such bristles, situated as previously described in 

 Paragns bicolor* 



The posterior breathing appendages on the dorsum of the last 

 segment, (Figs. 46, c; 49; and 50) are short (0.2-0.25 mm. long) 

 and nearly twice as broad (0.4-0.5 mm) ; divergent for half their 

 length; the dorsal spiracular spines (Figs. 49 and 50, a) moderately 

 long, sharply conical, with a very small lateral sub-basal spur. 

 The six elongate spiracles (b) are irregularly and considerably 

 curved, about 0.2-0.25 mm. long, the median one on each side 

 nearer to the ventral than to the dorsal one. 



The anterior prothoracic spiracles on the third segment 

 (Figs. 40, b\ 47, a) are small, sub-crescent shaped, the lip of the 

 spiracle marked by nine rounded, tooth-like lobes, (Fig. 48). 



The head segments bear antennje, (Figs. 40, a; 47, b) and 

 mouth parts (Fig. 47, r, d, c). The antenna are short, fleshy, 

 rudimentary. The mouth parts consist of the usual i^air of beak- 

 like jaws (c, d) and three pairs of mouth-hooks {e). The jaws are 

 V-shaped, sharp, slightly hooked at the tip, somewhat shorter than 

 usual, the dorsal extending slightly beyond the ventral when 

 apposed. The latter has a ventrally projecting basal spur on 

 each side. The mouth booklets are unequal in size the outer pair 

 largest; the other two ]jairs are situated close beside the jaws, 

 the dorsal ones heavier, the ventral pair small, slender. 



To the mouth parts is attached internally a complex system 

 of strong muscles and a broad, chitinous, oesophageal framework 

 (Fig. 5l', d). 



The Ohio Naturalist, Vol. XII, No. 1, p. 397, Nov., 1911. 



