288 bulletin: museum of comparative zoology. 



shape ; head of moderate size, somewhat narrower than body, 

 marked off from parts immediately following by rather conspicuous 

 oblique lateral grooves ; Avith a second pair of similar oblique grooves 

 lying farther forward on head. 



Size. — Length 15-25 mm., width less than 1 mm. 



Color. — General color of body deep reddish brown or purplish, 

 except head which is white, wdth characteristic dorsal marking (PI. 

 2, fig. 24). Ventral of same color as dorsal surface, but of a duller 

 tone, and often much paler in median line. Head pure white both 

 above and below with dark brown marking resembling a wa-eath in 

 heraldry on upper surface. Wreath has a transverse, posterior or 

 basal portion from which two semicircular branches pass anteriorly, 

 but do not usually join (PL 2, tig. 24 ; Text-fig. 21). A fourth 

 portion of figure passes forward in median line from basal portion 

 to anterior ends of semicircular latei^al bands, but does not usually 

 join them. All parts of marking have irregular edges so that the 

 wreath-like effect is made still more striking. The general effect is 

 often that of an open wreath with veitical cross-bar and substantial 

 base, the whole figure appearing upon a w^hite field. Wreath not 

 always open, for one or both of its anterior ends may join the ante- 

 rior end of vertical bar. Whole figure surrounded by white, con- 

 tinuous with that of ventral surface of head and separated fi'om 

 reddish brown of esophageal region by a fairly wide band of the 

 same color (PI. 2, fig. 24). Color of body and shape of marking 

 conspicuous after preservation, and even after imbedding in par- 

 affin. 



Blood vessels red in color, due to color of oval or rounded dis- 

 coid corpuscles. 



Ocelli. — Four ocelli of rather large size are arranged beside the 

 cephalic wreath nearly in the form of a square (Text-fig. 21). Ocelli 

 lie deep in tissues of head, and thus occupy a somewhat variable 

 position as regards the marking. 



Proboscis of moderate size ; whitish or pale flesh color ; provided 

 with ten distinct nerves. Central stylet slender and acutely pointed ; 

 basis about one and one half times as long as stylet, rounded pos- 

 teriorly, opaque and granular in posterior third (Text-fig. 56) . 



Pigment of body resides at base of integument. 



Alimentary canal. — Intestinal caeca slender, extending forward 

 to abut against posterior faces of dorsal brain lobes. 



