RILEY LARVAL HABITS OF BLISTER-BEETLES. 559 



hairs from the sides and on the horny mouth-parts ; mandibles long, promi- 

 nent, sickle-shaped, the outer edge having a slight elbow about the middle, 

 and the inner edge armed along terminal half with about 11 blunt, quad- 

 rate teeth, and slightly produced basally ; labrum short, slightly excavated 

 at middle, studded with very minute short hairs and with 4 stouter spinous 

 hairs around border. Antenna? not extending as far as do the mandibles, 3- 

 jointed, the basal joint bulbous and stout, the 2nd more slender and about 

 as long, the 3rd as long as the other two together and surmounted with 

 two fleshy tubercles, the outer unarmed and fusiform, the inner more 

 elongate and tipped with 4 or 5 stiff hairs. Maxillae short with a strong 

 3-jointed palpus, the basal joint less long than wide, the 2nd twice as long 

 and the 3rd four times as long, fusiform and slighly flattened and armed 

 with short spines on the inner terminal third — the chitinous covering on 

 all joints showing regular imbrications (the maxilla proper is composed of 

 two pieces not more than twice as wide as the palpus, so as to look rather 

 like two stout basal joints). Labium composed of a short basal piece and 

 a heart-shaped terminal piece, surmounted each side with a 2-jointed pal- 

 pus, the terminal joint thrice as long as the basal and with short stiff 

 apical hairs. Eyes round, dark, not prominent, and on the side, just behind 

 antennae. Body with the normal 12 joints and subjoint; with a corne- 

 ous covering superiorly, laterally, and across joints 11 and 12 ventrally. 

 the fleshy sutures distinctly separating the plates; joint 1 (prothoracic) 

 somewhat longer than joints 2 and 3 together, broadening posteriorly 

 somewhat thicker than the others and with a few stiff hairs at sides ; joints 

 2 and 3 subequal, with a transverse row (8 superior and several lateral and 

 subventral) of spinous hairs; joints 4-12 gradually diminishing in width 

 but increasing in length, each with a transverse row of superior short coni- 

 cal spines, and of longer spinous hairs at posterior border, a few more slen- 

 der ones nearer the middle, and a ventral row of still more slender ones 

 across the middle; anal joint with 2 longer setous hairs, about as long as 

 the 3 terminal joints together. Legs long; coxa? stout, swollen in middle 

 and I as long as femora ; trochanters small and short ; femora slender ; tibia? 

 still more slender and somewhat longer; tarsi rudimentary and with three 

 long spinous claws of unequal length : all parts beset with spinous hairs, 

 and the tibia* with four regular rows of more slender ones. Stigmata sub- 

 dorsal, with difficulty distinguished, from being concolorous, the first pair 

 mesothoracic, the rest on joints 4-1 1 inclusive. Color yellowish-brown, 

 with more or less black on the lower corners of joints 1, 4, 5, 10 and 11 ; 

 borders of head, thorax and of joints also somewhat more dusky; tips of 

 jaws and eyes dark brown ; legs and venter paler. A pale medial longi- 

 tudinal line observable especially on joint 1 ; the fleshy sutures and venter 

 white : the lobes of anus, ventrally, may swell so as to appear like fleshy 

 tubercles or pseudopods, but they are not used in running. 



Second Larva ; Carabidoid Stage. — With the first molt the whole 

 aspect changes. The head is now narrower than the prothoracic joint 

 and this again narrower than the three succeeding joints, so that the body 



