28 



FAMILY I. — CICINDELIM. 



attached two hooks. These are curved in such a way as to 

 prevent the larva from being jerked out of the burrow when 

 it happens to "catch a tartar" in the form of some larger 

 or stronger insect than itself. (Fig. 6.) While waiting 

 for prey its jaws, like those of a steel trap when set, are 

 wide open, ready to seize the first unwary insect that walks 

 rig. 6. over the living trap. It drags its victim, when captured, 

 Comstock) to the bottom of the burrow and there devours it at leisure, 

 squeezing out the juice and softer parts and rejecting the hard and 

 innutritious portions. 



The principal works of reference on the family are as follows : 



LeConte.— "Revision of the Cieindelidae," in Trans. Amer. Phil. 



Soc, XI, 1857, 27-63. 

 ScMupp.— 1 'Revision of the Cicindelida?,, " in Bull. Brook. Ent. 



Soc, VI, 1883-84, 73-108 ; 121-126, Pis. I-V. 

 jjQng —"Revision of the Cicihdelidse of Boreal America," in 



Trans. Amer. Ent. Soc, XXVIII, 1902, 93-186, Pis. I-IV. 



About 1,400 species of Cicindelidai are known, 93 species and 

 numerous varieties of which have been described from the United 

 States. These belong to five different genera, only two of which 

 are represented in Indiana. 



KEY TO INDIANA GENERA OF CICINDELID^. 



a Third joint of maxillary palpi longer than the fourth. I. Tetracha. 

 aa. Third joint of maxillary palpi shorter than the fourth. II. Cictndela. 



I. Tetracha Hope. 1837. (Or.", "in four parts.") 



This genus is represented in the southern portion of the United 

 States by two rather large metallic green species which are noc- 

 turnal in habit, hiding during the day and hunting by night. One 

 of the two occurs in the southern third of Indiana, while the other 

 has been found in southern Illinois and should be looked for in the 

 southwestern counties of this State. They have the head large, 

 with large circular eyes; mandibles with four teeth; thorax 

 smooth, broader than long, with a large triangular impression at 

 middle ; elytra slightly convex, broader than base of thorax, deeply 

 and coarsely punctate. 



