122 Journal New York Entomological Society. [Voi.iv. 
each side in front of the coxae. Abdomen of nine segments, the first 
eight about equal in size, each bearing a pair of spiracles, which are 
situated near the antero-lateral margin; ninth bluntly conical, bristly, 
beneath with a pair of papilliform appendages projecting from beneath 
a plate lying near the anterior margin. Legs moderate in length, very 
bristly, coxce very prominent, claw not toothed. 
The larvae were found in a rotten oak stump, and were at first 
taken to be Elateridae. The change to pupa took place April 27th, 
the beetle appearing May 6th. The pupa is white, 7 mm. long; sides 
of abdomen with compressed three-toothed processes; terminal segment 
with two short curved spines. 
Acamptus rigidus Lee. (Fig. 4.) 
Living larva white, head yellowish, mandibles castaneous. Form 
rather short, robust, position at rest, curved. Length 5 mm., width al¬ 
most 2 mm. Head large, deflexed, oval in frontal view. A rather 
deep impressed line runs the length of the median region above. Sur¬ 
face rather sparsely bristly, the bristles longer and more numerous near 
the sides. The antennae cannot be made out distinctly, but are very 
short and borne in pits over and outside of the mandibles. Eyes are 
wanting. Mandibles heavy, triangular, strongly chitinized, inner edge 
sinuate and with a strong tooth near the tip. Maxillae heavy, basal 
portion furnished on the masticatory face with several (eight or 
nine) strong articulated spines; palpus two-jointed, the joints thick, 
basal one the thicker and somewhat the longer. Mentum mostly mem¬ 
branous, the basal portion therefore indistinctly limited. The terminal 
part bears four moderate spines at tip; the palpi are two-jointed, the 
basal joint much the longer. Thoracic segments membranous, broader 
than the head ; they do not bear legs, but each has on the ventral sur¬ 
face a pair of large tubercles which bear ambulatory bristles—about six 
to each tubercle but not all of the same length. Abdominal segments 
not well differentiated from the thoracic, soft in consistence, the term¬ 
inal one obtuse. All the segments are bristly towards the sides, and on 
the back are seen four long bristles which arise near the tip of the 
abdomen. The median portion of the ventral surface is devoid of 
them. The dorso-terminal portion of the abdomen has a squamose ap¬ 
pearance, but under a high power these apparent squamules are seen to 
be short sharp spines. 
Larvae were sent me by Mr. A. B. Wolcott from near Bloomington, 
Illinois; they were taken, March 13th, from the interior of a soft maple 
tree. According to Mr. Wolcott’s account, this tree had received, at a 
