476 



AN INTRODUCTION TO ENTOMOLOGY 



B. Antennae straight without a distinct club, though with the outer joints often 

 more or less thickened; beak present at least in the female and pointing 

 directly forward ; form usually very slender and elongate, p. 536..BRENTiDiE 

 BE. Antennae straight or elbowed, always with a distinct club. 



C. Palpi flexible; antennal club rarely compact; beak always short and 

 broad; labrum present; thorax with a transverse raised line which is 



either ante-basal or basal, p. 536 Platystomid^ 



CC. Palpi rigid and labrum wanting except in the subfamily Rhinomacerinas 

 antennal club usually compact; beak variable in length, often long and 



curved downwards, p. 537 Curclxiomd^* 



AA. Beak absent or extremely short and broad ; tibiae with a series of teeth ex- 

 ternally, or, if these are wanting, with a prominent curved spine at apex; an- 

 tennae short, but little longer than the head, always elbowed, and with a com- 

 pact club except in PhthorophcEliis where the club is lamellate; palpi rigid; 

 body short, subcylindrical or rarely oval. 

 B. Anterior tarsi with the first segment longer than the second, third and 



fourth together, p. 541 — Platypodid^ 



BB. Anterior tarsi with the first segment shorter than the second, third, and 

 fourth together, p. 542 Scolytid^ 



Suborder ADEPHAGAf 



The name of this suborder, Adephaga, was suggested by the pre- 

 dacious habits of its members. These beetles are distinguished from 

 other Coleoptera by the presence of a suture on each side of the pro- 

 thorax separating the pleurum from thenotum, and by the fact that 



the ventral part of the first segment 

 of the abdomen is divided by the 

 hind coxal cavities so that the sides 

 are separated from the very small 

 medial part (Fig. 553). 



The Adephaga differ from other 

 Coleoptera in that the nutritive cells 

 of the ovaries alternate with the egg- 

 chambers. 



The larvag are campodeiform, 

 and differ from all other beetle 

 larvae in that their legs are six- 

 jointed except in a single exotic 

 species; this is one more segment 

 than is found in the legs of other 

 beetle larvee. The legs are usually 

 whereas the legs of other coleopterous 



I St A 



Fig- 553-— Ventral aspect of part of 

 thorax and abdomen of Galerita 

 janus: ist A, first abdominal seg- 

 ment ; 2d A, second abdominal seg- 

 ment. 



furnished with two claws, 

 larvag are one-clawed. 



This suljorder is represented in North America by seven families; 

 these can be separated by Table II, page 469. 



Family CICINDELID^ 



The Tiger-Beetles 



The graceful forms and beautiful colors of the greater number 

 of the tiger-beetles, those of the genus Cicindela, have made the 



*Sinc2 this table was published by Blatchley and Leng, the family Belidae has 

 been separated from the Curculionidae. See page 537. 

 f Adephaga: adephagous (dSTj^dYos), voracious. 



