L%2.] 12!) 



guis may be also perceived as a mere rudiment). Tlie teetli (^r projections 

 on both sides of tlie horny portion of the pseudopod are larger than in 

 the former species ; they are curved and pointed (unguiform). In all 

 other characters, this larva agrees with the former. Its length is about 

 2) inches. 



The third species, communicated to me by Dr. Horn, was found under 

 oak-bark, in a wet place. Although much smaller (it measures only 0.9)_ 

 and of different color, it has exactly the same structure as the large larvae, 

 so as to make it appear very probable that it belongs to the same genus. 



It is brownish-yellow ; the middle portion of the dorsal segments is red- 

 dish-brown, thus leaving a yellowish margin ; the pro- and mesothorax, as 

 well as the last abdominal segment are reddish-brown. The venter shows 

 none of the conchoid depressions of the large larvas. 



A specimen from Mississippi, similar to the latter in color and about an 

 inch long, was communicated to Dr. LeConte by Prof. S. S. Haldeman, 

 with the remark that it was luminous. Should this observation prove cor- 

 rect, it would not be surprising at all if the large larvae were also luminous. 



The points of relationship of these larvae to the EhiterUJsR^ Lampijridff. 

 and TelepTioridse. are evident ; but the analogies to the two latter families 

 prevail decidedly over those to the first. The mode of insertion of the 

 head, the structure of the mandibles and maxillae, the presence of an ocellus 

 on each side, the form and position of the pseudopod, even the general ap- 

 pearance of the body are more like those of the Lmnpyriila^. Neverthe- 

 less the differences are obvious : the dorsal discs do not project on both 

 sides over the ventral segments, the stigmata are placed on the sides of the 

 body and not below, on the venter^ the terminal joints of the palpi are 

 stout and blunt, and not slender and pointed as in both Lanipyris and 

 Tdephorus; the head, although inserted up to the root of the antennae in 

 the first thoracic segment, is not concealed by it, as in the Lampyrulse. 



The analogies with the ElateriJse are hardly more than those also shar- 

 ed^by the two other above named families; if there are any besides, they con- 

 sist in the position of the stigmata and, perhaps, in the structui'e of the 

 ventral side of the prothorax. But the differences are very considerable; 

 our larvae have neither the large head, entirely exserted from the protho- 

 rax, nor the peculiar structure of the basal pieces of the maxillae and the 

 labium which distinguish the Elateridse. Besides they have a pair of ocelli, 

 which are wanting in the latter, and the structure of the last abdominal 

 segment with the pseudopod is totally different. 



The mode of insertion of the mandibles of the larvae of Lycidx, they 

 being approximated at the basis and divergent at the tip, at once excludes 



