70 Annals Entomological Society of America [Vol. X, 



it again becomes very small, and continues as a tine cord until 

 it joins a knob-shaped structure near the apex (the end knob 

 Fig. 9. E. K.). 



In the larvae under consideration, these peg-shaped bodies, 

 or scolopalje, were found located near together w-ith their distal 

 ends in the region where the thickened portion of the chordotonal 

 ligament begins to taper posteriorly. In this rather narrow 

 region is located the distal end of the posterior of the four 

 scolopalcC, and the other three are arranged in a series anteriorly, 

 so that no two of the four organs are the same distance from the 

 posterior end. These scolopalae are considered by most authors 

 as the enlarged terminal portions of the axis fibers. However, 

 Schwabe is not of this opinion but considers each as a cap-like 

 enveloping apparatus itself. With this latter interpretation my 

 results do not accord. 



In general, the scolopalcC in Ergates spiculatiis are very much 

 like the ones which Schwabe described for the Orthoptera. At 

 the base of each is a vacuole (Fig. 9, V.) which connects with the 

 hollow central portion and, according to Schwabe, is filled with 

 a watery fluid. The number of outer strands or ribs (Fig. 10 

 B., R.) of which the scolopale is composed, is dift'erent from 

 what Schwabe found, in that there are seven large basal strands 

 which divide a little over one-third their distance distally; 

 making a total of fourteen (Fig. 10 C, R.). The dark cap, or 

 knob, located in the distal portion of the scolopale was found to 

 be composed of seven large, opaque divisions, corresponding to 

 the seven basal parts. (Fig. 10 D., E. K.). However, the exact 

 relation between these and the fourteen ribs could not be 

 determined, though it seems very probable that the ribs pass 

 along the exterior portion of the knob, and form the terminal 

 ligament (Fig. 10 A., T. L.), which extends into the cap cell for 

 about one-fourth the length of this cell. The entire scolopale, 

 except possibly the terminal ligament, is bathed in the watery 

 liquid, and is free to \nbrate. 



The enveloping cell is a rather large, elongated cell, which 

 lies like a funnel over the greater part of the distal end of the 

 sense cell (Fig. 9, E. C). It is composed of a light, nearly 

 transparent, alveolar, cytoplasmic structure, \\'ith an enlarged 

 nucleus (E. C. N.) towards its proximal end. 



