MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



77 



the larval state; but since no other Carabid or even Staphylinid beetles occur in caves associated 

 with Anophthalmus, there is every probability that the larvae in question are those of Anoph- 

 thalmias. I append the excellent description of Mr. Hubbard, with his carefully-drawn figures. 

 He also is of the opinion that the larvae can be none other than Anophthalmus. My own briefer, 

 earlier descriptions appeared in the American Naturalist (September, 1874, p. 562, and May, 1876, 

 PL II). 



Anophthalmus sp. — Larva (Fig. 18: a, head, much enlarged; b, underside of same). No detailed description of 

 this larva has yet been published. Packard's figure (I. c. x, PI. ii) sufficiently well represents the form. 



General form long and very slender, cylindrical, gradually narrower in front, more suddenly behind. Color 

 brilliant white; head and legs honey-yellow, with the mandibles darker; dorsal shields of the thorax tinged with 

 yellow, those of the abdomen colorless. Length of a somewhat distended specimen 8 mm =. 32 inch. Head rather 

 small, inclined upwards, nearly quadrate, slightly narrowed behind, flattened above and below, sides almost straight, 

 posterior border sinuate above, broadly emarginate below, with a few hairs, longer on the sides. Head above, with 

 anterior border projecting between the mandibles in an obtusely tridentate clypeus, with thickened, slightly reflexed 

 margins, a shallow, arcuate impression extending between the bases of the antenna? and following the frontal margin, 

 an oval depression at the summit of the frontal elevation midway between the antennae. Y-suture represented only 

 by the upper portions of its branches, which extend from the base of the clypeal projection on each side backwards and 

 inwards half way to the median line. Head beneath, with anterior border slightly rounded, lobed by the projection 

 of the meutum. Eyes wanting. Antennas placed above, in slight emarginations at the anterior angles of the head, 

 projecting forwards, not longer than the mandibles ; of four joints, the first uniformly cylindrical; the second shorter, 

 enlarged anteriorly, with a single bristle ; the third longer than the first, deformed, the basal half a thickened palm, 

 hearing a small, oval, porrectlobe, and minute papillae, the remainder of the joint a curved, cylindrical continuation, 

 joining the palm on the inside, two bristles on the palm and one on the finger; fourth joint appendiculate, bearing 

 several long lateral and one minute terminal bristles. Mandibles moderately long and thick, arcuate, with a short 

 tooth near the middle. Maxillae consisting of a very short cardinal piece, a stout cylindrical basal piece, longer than 

 the mandibles, with two long and several short external bristles above, with a row of six or seven spinules near the 

 inner margin, and two internal bristles near the apex, surmounted by a two-jointed internal lobe; the basal joint thicker 

 and shorter than the terminal, and four-jointed palpus ; the first and second joints thick, the first very short, the 



Fig. 18.— Larva of Anophthalmus sp. : a, head, much enlarged; ft, under side of same (after Hubbard). 



second much longer; third and fourth joints together equal to the first two combined, more slender; terminal joint 

 longest. Mentum elongate, convex, separated from the under surface of the head only by shallow longitudinal 

 parallel impressions, projecting slightly beyond the anterior border as a rounded lobe, surmounted by a convex 

 palpiger not broader than long, somewhat obcordate, the anterior emargination deeper when seen from above. 

 Labial palpi of two joints, equal in length, the first thick, the last slender. Ligula invisible from below, distinguish- 

 able from above as a minute papilla placed at the bottom of the emargination between the palpi, and bearing two 

 hairs. Thoracic segments narrower than the abdominal segments, moderately convex above, flattened beneath; the 

 prothorax oval, longer than broad, sides gently curved, anterior border sinuate, produced at middle ; meso and 

 metathorax broader than long, more strongly rounded on the sides, widest behind the middle; dorsal shields elliptical, 

 fringed with short brown hairs ; prothoracic shield larger than the following. Legs moderately long, subequal and 

 similar, sparsely clothed with hairs; of five joints and a claw; cox;e widely separate, conical, stouter, and longer: 

 than the other joints; trochanter, femur, and tibia exactly equal; tarsal joint rather longer, more slender, tapering; 

 tarsal claw shorter, curved, pointed. Abdominal segments nine in number, convex above and below, strongly rounded 

 on the sides; dorsal shields transverse, elliptical, indicated by fringing, short, brown hairs. On the side of each 

 segment a prominence bearing a few hairs. Segments one to four insensibly increasing in size, then decreasing to the 



