PINE BARK-BEETLES. 



713 



41. The southern tomicus. 



Tomicus cacographus Le Coute. 



Injuriug the piues of North Carolina aud southward even more than T. jrini in the 

 north ; a very similar beetle, with similar habits. 



This is the Bostrichus 2Jini of ZimDiermanu, but not the oue so named 

 by Say. It inhabits, according to Le Conte, the Southern and Western 

 States. It is said by Le Conte to be similar to Tomicus caUigra2)hus, 

 but is usually of smaller size (3.5 to 4""", .14 to .16 inch) ; the cusp of 

 the second interspace is very small, aud that of the third is wanting ; 

 that of the fifth is compressed and scarcely more prominent than that 

 of the fourth interspace, and is somewhai; connected with it; there are 

 but two teeth between the tooth of the fifth interspace and the terminal 

 acutely elevated margin, and these teeth are all of them less prominent 

 than in T. calUgraphus in some specimens (male), but equally prominent 

 in others (female), though less acute than in T. calUgraphus. The inter- 

 spaces from the third outward are marked each with a regular series 

 'of punctures behind the middle, whereby it differs 

 from the next species (T. confusus Le Conte, of south- 

 ern California and Arizona). The club of the antennae 

 is quite similar to that of T. calligraplins.* 



The mine made by this species has been found under 

 the bark of the southern pine at Atlanta, Ga., the 

 beetle from it having been labeled by Dr. Horn. 

 The mine is like that of C. calUgraphus, but the 

 main burrow is narrower, being 2i""" wide, aud the 

 holes are smaller, the beetle itself being smaller. 

 Living beetles were taken from the mine March 28, 

 1881. 



Fig. 2i6.— Tomicus ca- 

 cographus. — Marx del. 



42. The pine bark- beetle. 



Tomicus pini Say. 



From a common center excavating several broad shortish galleries lengthwise of 

 the trunk in opposite directions, resembling the spread fingers of a hand, a bark- 

 beetle very similar to the preceding, but of smaller size, measuring only .15 in length, 

 aud with but four small teeth on each side of the concave declivity at the tips of its 

 wing-covers, aud usually showing more or less distinctly an impressed line along the 

 middle of the hind part of its thorax. (Fitch.) 



"The tracks formed by this insect are so different from those of the 

 other species that they are recognized at a glance. They occur under 

 the bark of old trees of the white pine, and have some resemblance to 



* A number of other Scolytids which probably infest the pine are described by Le 

 Conte in his work on the Rhynchophora of America north of Mexico, where all the 

 species are characterized, and to which the reader is referred. 



