56 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY.. 
rounded light spots may be found on the dorsal surface of the body in light- 
colored individuals, usually associated with certain papille. 
There is a certain correlation in the development of light spots in different 
parts of the body ; an animal which has a well-developed median vitta will 
also have conspicuous marginal and intermediate light spots and vice versa. 
The ventral side of the body is much lighter in color, marked only by a 
few longitudinal bands of dull brown or greenish brown. The number of these 
bands is either eleven or twelve according as there is present, in addition to 
five pairs of bands laterally placed, a single broad median band or a pair of 
narrow paramedian bands separated by an irregular median clear band. 
From the under side of the body one can often see in living animals the green 
pigmented crop diverticula showing through the semi-transparent body. 
Figure C.— G. parasitica, var. rugosa. Dorsal view of posterior part of body, 
showing position and approximate relative size of papilla. From a Cam- 
bridge, Mass., individual. 
(2) Var. rugosa, var. nov. 
The dorsal surface of the body is much rougher in this variety, the papille 
being larger, more numerous, and structurally more complex. Instead of being 
simple, low, and dome-shaped, the more conspicuous papille are extended dis- 
tally in several divergent whitish points, giving the body a decidedly rough, 
harsh feeling to the touch in the case of hardened specimens. The larger 
papille are likewise rendered more conspicuous by the fact that they are 
commonly unpigmented, though placed in a generally dark background. 
The arrangement of the principal rows of papille on the dorsal surface is 
similar to that in G. plana, but with the following easily determined and con- 
stant difference. In somites xxi. and xxiv. (Figure C), the median row of 
papille becomes inconspicuous or disappears altogether, and a large papilla 
appears on either side of the median line, on the sensory ring of each somite. 
The ventral surface is free from papille as in plana. 
