78 



MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



seventh, which equals the first ; eighth sensibly smaller ; ninth much smaller, conical, ending in a pair of rather 

 stout appendages, not exceeding the segment in length, curving inwards, hearing bristles, and a cylindrical and 

 anal prolog, when distended, showing two diverging lobes equal to the appendages in length. Stigmata normal, one 

 larger pair on the prothorax, placed posteriorly a little below the middle of the side, the following on segments one 

 to eight of the abdomen, above and a little in advance of the lateral hair-bearing prominence, exceedingly minute, 

 and, from their want of color, barely visible. The hairs of the body are few in number and very short, those of the head 

 are no longer than are seen on most Carabid larvae, and bear no comparison to the long sensitive hairs found upon 

 all parts of the imago. 



A single specimen in alcohol, found on wet sand near Hebe's Spring, Mammoth Cave, six miles from the 

 entrance. The species may be either A. tellkampfii or A. menetriesii. Except in its very elongate form I can find no 

 striking differences between this and other Carabid larvae allied to Trechus. 



ADELOPS HIRTUS. Plate XIX, figs. 4, 4a; XX, figs. 8, 9, 9a. 



Though the pupa of the Adelops was not found by myself, two larva occurred, oue in the 

 Labyrinth of Mammoth Cave. Fig. 9 represents this interesting form, and 9a one of the antennae 

 magnified. It bears some resemblance to the larva of Agathidium (I know of no figure of a 

 young Catops with which to compare it), but the head is very much larger, and nearly as wide 

 as the prothoracic segments. The body tapers rapidly from the prothorax to the end, and is pro- 

 vided with long hairs; it is dull white. There are no traces of eyes. I add Mr. Hubbard's 

 descriptions of both the larva and pupa of A. Mrtus, of which he gives full details. I also insert 

 Hubbard's figure of the cells of Adelops, of which, however, no description is given. 



Adelops Mrtus Tellkf. — The immature forms of Adelops have never been properly noticed. Packard's figure of 

 the larva (1. c. vol. x, PI. ii) represents a much contracted specimen, the body tapers too rapidly, and the thoracic 

 segments are nearly one-third too wide ; antenna (Fig. 4, a, of his plate) is incorrectly drawn. 



The following description, made from numerous well-preserved specimens, is an attempt to give this larva the 

 careful attention its importance deserves. 



The body is stout and cylindrical, gradually tapering from the thorax, slightly compressed above, dorsal shields 

 covering the segments, very thin and transparent. Color, dull white, with the head darker, and tips of mandibles 

 alone testaceous. Length, 4.4 mm = .17 inch. Head free, nearly as wide as prothorax, rounded, convex, broader than 



--''f.fTii')^ ^iji 



Fig. 19.— Cells of Adelops. 



Fig. 20. — Adelops Mrtus: a, head of larva from above-, 

 6, antenna; c, underside of head, with labrum and left 

 maxilla; enlarged (after Hubbard). 



long, sides slightly rounded, truncate in front, sparsely covered with fine hairs. No ocelli. Antennae arising from the 

 convex sides of the head, just before the middle, directed backwards; of four joints; the first tuberculous; the second 

 elongate-cylindrical, slightly enlarged anteriorly; the third twice as long as the second, slightly curved, thickened 

 on the inner (anterior) side, sparsely covered with bristles, a longer bristle on the inside at the thickest portion, a 

 stout spine on the inside at apex; fourth joint appendiculate, bearing lateral . bristles and a short spine at tip. 

 Epistoma prominent trapezoidal, strongly angulate, edges straight. Labrum movable, deflexed, transverse, oval, 

 bearing spines above and below. Mandibles stout, lobed at base, with molar surface striate, moderately curved, 

 bidentate at tips, overlapping when closed. Maxillae large, prominent, passing the mandibles, protuberant and 

 strongly angulate at base, consisting of elongate cardinal and basal pieces, and a pyramidal palpiger, obscurely sepa- 

 rated into two lobes by a longitudinal furrow, the upper lobe bearing internally four or five spines, the lower lobe 

 terminating in a curved, ciliated crest; maxillary palpus, arising from the base of the palpiger, of two stout basal 

 and one slender, spiniform, terminal joints. Labium with a large rounded men turn, broader .than long, slightly nar- 

 rowed behind, bearing long hairs; labial palpi, widely separated by the base of the ligula, of two joints and a palpig- 

 erous piece resembling a third joint. Ligula very large, prominent, elongate, with a square lobe in front, nearly 

 reaching the tips of the palpi. Thoracic segments equal, larger than the abdominal segments, twice as wide as long ? 



