1862.] un 



" feet, which however are sometimes so small, as to be perceptible only 

 " when magnified, even in hu'ge sized larvte. The Ceramhytidx^ (^Cc- 

 " rambt/x, Callidiion,) have on the posterior side of the prothorax, above 

 " and below, a fleshy, transverse fold, separated by a furrow from the 

 " horny disc of this segment; in the Fn'onidse. and Lepfio-idse, the same 

 " fold is visible only on the underside, The Lcphn-se have a large, flatten- 

 " ed head, as broad as the prothorax, whereas in the other longieorn 

 " larvse the head is small and much narrower than the thorax. The larvai 

 " of Prionidse, show the least differences from those of the Lcpfuridx, and 

 " that of Spondi/li)> is remarkably allied to the latter." 



These characters, if used for the determination of larvae will be found 

 useful, but not in all cases exhaustive. The position of the mesothoracic 

 stigmata, for instance, is frequently such that it is difficult to decide 

 whether they belong to the mesothorax itself, or to the fold between it 

 and the prothorax. The absence of feet seems to be a good character of 

 the Lamildfe ; that exceptions occur, however, is proved by the larvae of 

 Arhopalnx, which has no feet, although belonging to the Ccramhijcidae. 



A striking instance of the uniformity of structure which prevails 

 among the longieorn larva? is aff"orded by that of Parmidni. This genus 

 is located on the extreme limit of the family ; the appearance of the per- 

 fect insect is so different from that of the other lonijicorns that one miaht 

 be tempted to suspect, that its location among them was unnatural. 

 Nevertheless, its larva is a true longieorn larva, and could not possibly be 

 mistaken for anything else. The general appearance, the structure of the 

 head and mouth, the large development of the prothorax, with its horny 

 disc above and below, the fleshy protuberances along the back and the 

 venter, the Y-shaped anal opening, etc., this larva has in common with 

 all the others of the family. The size of the head, the presence of feet, 

 the fleshy fold on the posterior ventral margin of the jiiothorax, the posi- 

 tion of the first pair of stigmata, and the development of the ninth abdo- 

 minal segment, the anal portion of which, usually separated by a fold in 

 longieorn larvse, is very small hero, are so many indications of its i-elation- 

 ship to the Frionidx. 



Length about an inch. 



Head large, not much narrower than the prothorax. inserted in it i'ur 

 more than one half of its length ; when extracted its appeai-s heart- 

 shaped; a longitudinal suture runs in the middle, above and below; the 

 excision between the posterior rounded lobes is filled up with a fleshy sub- 

 stance forming the connection of the head with the prothorax. Its color 

 i.'^ yellowish. exc(!])t the margins of the oral o]iening. which are brownish. 



