402 



NATURAL HISTORY OF ARTHROPODS. 



Fig. 505. 

 iltjeanL 



the elytra are widely inflexeil, the jnotliurax !<c'arcely margined, and the terminal 

 joint of the maxillary palpi shorter than the third joint. A. cyUmlriformis, the only 

 species, is found in Kansas, New ^lexieo, and Arizona. It is the largest 

 species of this family found in the I'nited States, and is brownish-black 

 in color. Its habits are nocturnal. In Omits the elytra are narrowly 

 inflexed, the prothorax distinctly margined, and the last two joints of 

 the maxillary paljii subecjual. The nine described species are all from 

 the Pacific slojie of North America, and are nocturnal. 



In Tetracha, the only representative of the Megacephalini found 

 in the United States, the eyes are large and prominent, the jiosterior 

 Otrnis coxa^ contiguous, and the third joint of the maxillary palpi longer 

 than the fourth. 2\ virr/inica is dark metallic green abo^e, with light 

 brown lesrs and antenuffi. Its length is about 0.75 of an inch. It 

 is found in the southern Atlantic states concealed mider logs 

 and bark by day, for its habits are crepuscular. T. <xtrolino, 

 which has a yellow spot near the apex of each elytron, and is 

 about 0.6 of an inch long, is widely distributed o\er America, from 

 the middle United States to Chili and Peru. 



The Cicindelini are represented by about sixty Xorth American 

 species of Cicindela. In these insects, the tliird joint of the max- 

 illary palpi is shorter than the fourth. The ii\e species of Cicin- 

 dela figured are all common in tlie northeastern United States. 

 Their size and figuration are well illustrated in the cuts. C. sex- 

 (jattuta is very bright metallic green, often with a Ijluish lustre, 

 and the yellow spots upon its elytra are subject to some variation. 

 This species, like the next, frequents sunny roads in the woods, where the grass is woni 

 down quite short. ('. lyiojmrea is purplish-bronze color, with the lateral margin of the 

 elytra metallic green, and the markings ujion the elytra yellow. C. (/enerasa is cop- 

 pery bronze color, with the yellow elyti-al markings extending as an outer margin 



> 



Fig. 506. — Tetrachn, 

 Carolina. 



Fig. 507.— Tiger beetles, a, Ciciniiela generona ; b, C. tranquebarlca ; c, Cpurpurm; d, C. hirtlcnlUs; 



e, C. sex-gnttata. 



around the elytra, and C. tranquebarica and C. Iiirticollis are of dark bronze color, 

 sometimes almost T)lack, vdxh yellow markings on the elytra. C. generosa, C. tran- 

 quebarica, and C. hirticollis frequent s.mdy liver banks. In C dorsalis, which swarms 

 along the south coast of Long Island, the elytra are nearly white, and the ]iuri)lish 

 prothorax is clothed with white scale-like hairs. This coloration is evidently pro- 

 tective ; for these beetles are very dilficult to see upon the white sand of the sea- 

 shore, and still more diflieidt to capture, as they fly, without the slightest hesitation, 



directly out over the surf. 



George DrsrMOCK. 



