74 Psyche [June 



body of the larva. The insect lies habitually with its head at the 

 opening of the tube and presumably with the abdominal hump 

 catching at the corner. Its sensory organs are so keen that it 

 retires into its tube before an observer can look in. After many 

 minutes of quiet watching one may see it no longer alarmed,' and 

 back in place. The burrows exhibit three general types, each 

 species never departing from its own. Fig. 1 is that of C. punc- 

 tnlata, the simple burrow, depending on its depth for victims. 

 Apparently the larva has to leave its tube to devour its prey. Fig. 

 2 is the surface aspect, but applies equally to most other species, 

 and is given here merely for contrast to the aspect of C. lepida. 

 Fig. 10 is an enigma to me. It looks like a C. punctulata burrow 

 without trace of a tube. I have burrows of young larvse, in which 

 the tube is scarcely 3-32 if an inch in diameter. It may not be 

 argued that the burrow, Fig. 10, indicates that the trap is dug before 

 the tube. On the contrary, the tube is dug and enlarged as the 

 larva grows. 



Figs. 3 and 8 are of the no-trap plan. One is typical of what I 

 assume to be 6*. modesta. The other has a trap slanting upward, 

 useless as a prey-catcher. I assume that this was made by the 

 enforced removal of a pebble. Fig. 6 is the double-trap type, which 

 I know to be characteristic of C. tranquebarica. Here the victim 

 has the choice of two shallow pits to flounder in while the tiger 

 leans out of its tube devouringly. The fourth type is the single- 

 trap, the pit generally of some length and slanting not far from the 

 horizontal. Fig. 5 is the typical C. lepida burrow on open sand. 

 An insect having fallen therein would naturally run for safety into 

 the cul de sac. Fig. 9 is a C lepida burrow under a grass tuft. 

 The cul de sac meets requirements of environment, but is much 

 broader. Fig. 7 is an aberration or some species not identified. 

 It was larger than and its surface different from that of C. lepida. 

 I suspected C. consentanea from environment, but lack evi- 

 dence. The C. sexguttata tribe does not generally burrow in 

 open spaces. 



Two common species, C. rucjijrons and C. dorsalis, are still to be 

 plaster-casted. I can safely predict that their burrows will be 

 found to have specific distinctive characters. In fact, I ma> 

 predict that every species of Cicindela can be differentiated by its 

 larval burrow. 



