241 



tract, genitals and side-muscles, the nervous cords, with their 

 ganglia, can be seen with the naked eye, lying along the median 

 line of the body on the under muscular sheet. 



The supraoesophageal ganglion measures from its middle to 

 the cornea of the eye a little less than 2 mm., and is more con- 

 vex than the infraoesophageal ganglion, with which it is 

 connate at the sides. The widest diameter of the infraoesoph- 

 ageal ganglion is 1 mm., and it is about 0.6 mm. thick. At the 

 side of the supraoesophageal ganglion arises the o])tic nerve, 

 and near the posterior part of the base of the latter, the an- 

 tennal nerve. From the ventral surface of the infraoesophageal 

 ganglion arise two pairs of fine nerve-threads, but whether 

 they extend to the mouth-parts, or whether they are sympa- 

 thetic branches, I cannot say. The infraoesophageal ganglion 

 is connected with the first thoracic ganglion by two commis- 

 sures, and the other ganglia are connected in the same way. 

 There are five abdominal ganglia, of which the last two are 

 nearer together than the others. The terminal commissures 

 run, in the females, into the base of the ovipositor, but as this 

 would be an anomalous place for a sixth ganglion, I think they 

 subdivide themselves into smaller branches. 



The soft tip of the terminal joint of the labial palpus is cov- 

 ered with an ai'ea of fine papillae. 



Directly above the eyes in all Cicindelidae, and in the larvae 

 of Amblychila, Omus, Tetracha and Cicindela, are three stout 

 bristles. Judging from their position and constancy, pi obablv 

 they have a sensorial function, either as organs of touch, or, 

 what is more likely, as auditory organs. 



The biological notes of Prof. F. H. Snow and of Mr. H. A. 

 Brous teach that Amblychila has " a very poor eye-sight and 

 an acute sense of touch, chiefly concentrated in the vibratory 

 antennae." Burmeister says,^ " Organs of touch they (tlie 

 antennae) cannot be, for their surface is too hard and horny, 

 and besides, all insects have for this purpose organs furnished 

 with a very delicate touching-substatice ..." The numerous 

 bristles on the antennae of Amblychila and of other insects 



1 Burmeister: tr. bj' Shuckard, p. 485, 



