454 



PROCEEDIN08 OF THE NATIONAL MU8BVM. 



VOL. 46. 



unsplit, inner edge, on which the teeth are situated; these teeth being 

 simple, not doubled. Absolon ('03, p. 103) described the inner edge 

 C'Innenkante") as being formed by the union of the edges of two 

 lamellae, with a series of simple teeth on one of these lamellae. 

 Wahlgren ('06a, p. 64) arrived independently at 

 the same conclusion as Absolon. I find that 

 the inner border is formed by the united edges 

 of two lamellae, that the teeth are simple, and 

 that each tooth arises from both lamellae, as in 

 figure 4 — not from one of them. My figure for 

 T. Jlavescens var. americanus agrees essentially 

 with that of Borner ('01, p. 39) for T. plumheus 

 (Linnaeus) Tullberg, the species used by all these 

 European investigators; and in examples of the 

 latter species, received from Doctor Schaffer, I 

 have seen the teeth as described by Borner. 

 Wahlgren's figure ('06a, p. 64) is correct for an oblique view of the 

 claw, but is misleading as to the exact relation of the teeth to the 

 pair of lamellae. In order to see this relation, the claw must be 

 turned until it presents a symmetrical view, as in figure 4. 



Fig. 5.— Tomocebus 

 flavesckns, vak. 

 americanus. left 

 side of tenaculum. 



X 238. 



FlQ. 6.— TOMOCEEUS FLAVESCENS, VAK. AMEEICANUS. POSTEEIOE SEGMENTS 

 OP ABDOMEN, NUMBERED TO SHOW RELATIVE POSITIONS OF TERGA AND 

 STERNA. /, FOLD. X 39. 



The tenaculum (fig. 5) of the third abdominal segment does not 

 vary greatly in the genus Tomocerus. The base of the tenaculum 

 bears anterior setae, which differ somewhat in number and position in 

 different species without, however, having any specific value of prac- 

 tical importance. 



