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MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 79 
side margins produced, dorsal surfaces with, two, and on the prothorax with several, rows of short, blunt spines. 
Sides of prothorax less strongly rounded than the following segments; each with a pair of moderately long legs, of 
two joints and a terminal claw-joint representing the tarsus; tibia clothed with spinules. Abdomen of nine strongly 
transverse segments, each with a row of six blunt spines above, which are replaced by sharp spinules on the ventral 
surface, terminal segments bearing a pair of moderately long appendages, with one short, cylindrical basal joint, the 
remainder setiform, very obscurely multiarticulate. Anal prolongation stout, tubular, ending in four fleshy lobes, 
which are usually retracted into the rectum. Stigmata, nine pairs; the first pair large, situated in the fold at the 
hind angles of prothorax, the eight remaining pairs on the first eight abdominal segments, at the middle of the edge 
of the dorsal shield, and immediately below a short tubular spine (the last spine of the dorsal row). 
The larva of Adelops presents the general characters of Silphid larv® as given by ErichSon, but is most closely 
allied to those of Liodes and Agathidium. From the larger Silphid® it differs notably in possessing a movable labrum, 
not soldered to the clypeus, and from all described larv® of the family in having the palpigerous pieces of the lower 
lip (labium) widely separated, forming in fact a third joint of the palpi, and in the size and prominence of the ligula. 
There are no long sensitive hairs upon any part. Of the larva of Catops, its nearest ally, no description is known to 
me, except that of C. fuscus Gryll. by Erichson, which is too short to be of use. 
The pupa (Fig. 21: a, ventral; 6, dorsal view, enlarged ten times ; e, anal appendage, much enlarged), now first 
made known, is characterized as follows : 
It is short, thick, almost conical, broadly rounded anteriorly, suddenly tapering behind, sparsely covered with 
fine hairs.' Head bent downwards upon the breast, not visible from above; upper lip prominent, emarginate; tips of 
palpi projecting, free, constricted at the joints. Antennae bent up¬ 
wards and backwards, lying back of the knees, in the concavity of 
the prothorax, and projecting beyond the dorsal surface at its hind 
angles, constricted at the joints, the outer half a heavy club, each 
articulation of which bears large, spiny tubercles. Prothorax very 
large, almost hemispherical, covering the body like a hood. Wings 
folded over onto the ventral surface, lying under the anterior legs, 
covering the thighs of the last pair. Dorsal surface almost entirely 
exposed; at the base of the wings three conical protuberances 
placed close together, the largest on the median line covering the 
scutellum, the two smaller on either side upon the elytra; the tip 
of the metathorax protuberant, acutely prolonged over the first ab¬ 
dominal segment. Abdomen strongly arched downwards, termin¬ 
ating in two thigh-shaped appendages, with two or three long 
hairs on the sides, and a curved bristle at their apices; between them, at the base, a lobe surmounted by two con¬ 
verging tubular processes. Color, transparent white. Length, 2.5 mm = .10 inch; width, 1.5 mm =.06 inch. 
VARIATIONS IN THE SPECIES OF CAYE COLEOPTERA. 
Anophthnlmus tellkampfii. —In twenty-seven specimens from a single area, the Labyrinth, in 
Mammoth Cave, there were very slight variations in size; all were about .30 inch in length, none 
over; the smallest was .27 inch long. Mr. Hubbard found “ but little variation ” in forty speci¬ 
mens. 
In twenty-five specimens from Diamond Cave the only differences I could observe was in size; 
the largest was .30 inch, the smallest .25 inch. 
Among sixty five individuals collected by Mr. Sanborn in “Lo ng Cave, nearly one mile from 
daylight, beetles at several damp localities, May 11;” the longest was .30 inch, the shortest was 
.25 inch, both being males. There were no other variations, except that the shortest has a very 
siigEHy broader prothorax, though this is almost imperceptible. The color of all is the same, and 
there is a remarkable uniformity in them, except a few pale ones recently out of the pupa state. 
In fourteen specimens from Sugar-Bowl Cave, 3 miles northwest of Glasgow Junction, the 
largest individual was .30 inch and the shortest .25 inch in length. They did not differ from 
Mammoth Cave examples. Eleven specimens from White Cave did not differ from Mammoth 
Cave examples; they were .30 inch long. Twenty-two specimens from Salt Cave showed abso¬ 
lutely no difference from Mammoth Cave ones, and no perceptible variation from a length of .30 
inch. 
Anophthalmus menetriesii from different caves varies somewhat in size. In ten specimens fi om 
Diamond Cave the variation is only in size; the longest being .22 and the shortest .19 inch in 
length. (“ Of twelve A. menetriesii, three show considerable variation in size and form and one 
is plainly pubescent.” Hubbard.) 
Fig. 21 .—Adelops hirtus : a , pupa, under side; 6, pupa, from 
above; c , anal appendages (after Hubbard). 
