THE GENLTS PISSODES. 17 



The suhgalea, galea, and lacinia are represented by one broad lobe 

 without even the indication of sutures separating the hicinia from the 

 subgalea as in Dendroctonus. The interno-hxteral face and internal 

 margin of the lobe are armed with stout lacinial teeth, while the externo- 

 lateral face is clothed with bristles and hairs, those of the posterior 

 angle being very long and curved. The palpus is stout, conical, 

 3-jointed, shorter than the palpifer, joints 1 and 2 of about equal 

 length and 3 shorter. 



The character of the mandibles is shown in figure 2, A and B. 

 They are stout, subrectangular, and without a scar on the "outer 

 surface." The inner edge has 3 prominent teeth; the apical, sub- 

 apical, and median teeth are stout, triangular, and about equal in 

 size, the molar not represented. The outer lateral area is deeply 

 impressed at the base of the lateral muscle process, which is long 

 and broad. The ventral articulation has a simple median "ball" 

 condyle, wliile the dorsal articulation has a median "ball" con- 

 dyle surrounded by a deep fossa. The exteiisor and retractor muscles 

 are attached to the inner wall of the cranium, and are connected to 

 the mandibles by long, very slender, subchitinous tendons (fig. 2, %,]{:). 

 The pharyngeal hracon is also long and slender, and apparently sub- 

 cliitinous, thus serving as a rigid support or brace to the lateral wall 

 of the pharynx. 



The characters of the antennse are shown in figures 1 and 2. The 

 scape is slightly shorter than the funiculus, and the club is about half 

 as long as either one. The funiculus is 7-jointed; joint 1 is about 

 as long as joints 2 and 3 together; joints 2 to 7 are of about equal 

 length and increase slightly in width toward the club. The club 

 is subcylindrical, ovate, acuminate, with apex subacute and with 

 5 obscurely defined joints. Joint 1 is much longer on one side than 

 on the other and sparsely clothed with short hairs and long bristles; 

 the remaining 4 are about equal in length, slightly more impressed 

 on the anterior face, and densely clothed with fine hairs which obscure 

 the sutures; the sutures, according to the point of view, may be 

 oblique, transverse, recurved, or procurved. 



The pregula is clearly defined in the ventral area of the rostrum. 

 The sutures diverge anteriorly from their junction with the median 

 gular suture near the base of the rostrum. The pregena is represented 

 by the longitudinal area between the pregular suture and the antennal 

 groove. 



THE THORAX. 



The thorax, as is usual, consists of 3 distinct segments (fig. 9, p. 28). 

 The prothorax articulates freely with the mesothorax, but the 

 mesothorax and metathorax are firmly connected. The combined 

 length of the sternal areas of the three thoracic segments is slightly 

 greater than that of the sternal area of the abdomen, while the com- 



