LONG-HORNED WOOD-BORERS. 153 



ally more gradual and rounded, and in the Lamiides sharper or more 

 abrupt. The face is also rather convex in the Cerambycides, and flat 

 in the Lamiides. This distinction, however, is sometimes unreliable, 

 and tlie more definite characters stated in the table of subfamilies, 

 must be resorted to in cases of doubt. But the minor groups can often 

 be distinguished by their style of coloration, as hereafter specified. 



The Cerambycides are often seen resting upon the trunks of trees in 

 crevices of which the females lay their eggs. Some of the smaller spe- 

 cies are found upon flowers. Many of them possess the stridulating 

 power described in the general remarks upon this family. The larvfe 

 resemble those of the Priouides in having six very small legs, but they 

 are more cylindrical in their form, and the incisions between the seg- 

 ments are more deeply impressed. 



The subfamily of Cerambycides is divided by Lacordaire into two 

 groups, wliich are primarily distinguished by the difference in the facets 

 or granulations of the eyes. In the first group the granulations are 

 comparatively coarse and the lines between the facets are deeply im- 

 pressed. In the second group the granulations are much finer, and in 

 many genera the surface of the eyes, unless strongly magnified, appears 

 to be almost plane. But this distinction is only comparative, and can 

 only be appreciated by an actual examination of some of the species in 

 the two divisions. 



In the following table we have first separated the group of Asemini, 

 upon the more definite character of the form of the eyes, and then di- 

 vided the remainder in accordance with the difference in the granula- 

 tions. 



Tlje following is a table of the groups of Cerambycides : 



A. Eyes oval, almost entire, or but little hollowed on the inner side (except Tetropium); second joint 



of antenncB at least half as long as the third ; form somewhat depressed ; colors obscure : 



Asemini. 



A A. Eyes with a deep notch or sinus ; second joint of antennaB not half as long as the third. 

 B. Eyes coarsely granulated. Form moderately convex; antennae usuallj as long at least as the 

 body, often much longer in the males ; thighs usually slender ; colors gray or brown. 



Cerambycini. 

 B B. Eyes finely granulated. 



C. Form more or less depressed ; thighs usually strongly clubbed ; colors various Callidxini. 



C C. Form convex; thighs usually slender or moderately and gradually thickened. 

 D. Scutellum rounded ; size various ; colors usually black or brown with transverse yellow or 



whitish bands Cl.YTlNI, 



D D. Scutellum triangular and pointed; size large or medium ; colors usually black and red : 



aiENASPINI. 



The group of Asemini contains two principal genera, Asemmn, Esch., 

 (from the Greek asemos — ohscure) containing six species of a size a little 

 above medium, with small, hairy, and finely granulated eyes, and Crio- 

 ceplialus, Muls., (from Tcrios — a ram ; and Jcephale — the head) containing 

 nine species of large size, most of them being about an inch in length, 

 with large and less finely granulated eyes, and having from two to four 

 large shallow depressions on the disk of the thorax. 



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