Sept. 1896] WiCKHAM : LaRV^ OF SOME BEETLES. 123 



point about five feet from the ground, an injury which had removed 

 the bark, the exposed place then being attacked by the large horn-tail, 

 Tremex columba. For about an inch from the surface the wood was 

 quite hard, but inside of this shell was quite badly decayed and soft. 

 The young Acamptus larvae were found just entering the soft wood on 

 sides of the Tremex burrow, while the large ones were taken at the end 

 of a gallery of an inch or two in length, this gallery having its origin 

 from the side of that of the Tremex. The full grown larvee had formed, 

 at the date mentioned, rounded cells, apparently for pupation ; these 

 cells had no evidence of silk in their construction. Mr. Wolcott has 

 kindly furnished a drawing to illustrate the work of this larva (Plate 

 IV, Fig. 6). The burrow of the Tremex is shown at Tr, while 

 that of the Acamptus is marked Ac. The black spots in the latter 

 show where the larva had made short secondary burrows for the depth 

 of an eighth of an inch or so. All of the larvae taken by Mr. Wolcott 

 were found with the head pointing upward, whether the burrow ran 

 up or down. This may simply be the position of rest for the winter. 

 A few adults were taken with the young, at the date cited, but they were 

 more numerous in November preceding. None have been seen on the 

 outside of the tree, nor do any of the healthy trees seem to have been 

 attacked. 

 Yuccaborus, sp. (Fig. 5.) 



Larva robust, natural position curved, consistence soft. Color 

 nearly white, head testaceous, mouth dark brown. Head more strongly 

 chitinized than the rest of the body, its upper surface sparsely bristled, 

 median line distinct for about one-half of the distance from the hind 

 margin when it forks, separating into two lines, one of which extends 

 towards each anterior angle. Antennae extremely short and contained 

 in pits at the sides of the head near the mandibles. Clypeus separated 

 from the front by a distinct suture \ in form transverse, approximately, 

 thrice as broad as long, narrower anteriorly, sides oblique. Labrum as 

 broad as the anterior margin of the clypeus but shorter than the sclerite, 

 sides rounded, bristled as shown in the figure. Mandibles extremely 

 heavy, triangular in outline, the inner margin irregular but without de- 

 fined teeth. Maxillje with very heavy base, inner face flattened and 

 armed for about one-half of its length with a dense covering of bristles. 

 Palpi two-jointed, the first joint much stouter than the second. Labia 

 palpi two-jointed, almost like the maxillary ; the ligula is emarginate at 

 tip, and each of the projections thus formed bears a bunch of bristles at 

 apex. Prothorax about as long as the meso- and meta-thorax combined, 



