OF WASHINGTON. 



323 



acter is also well shown in an unbred larva of Oberea from apple 

 twigs, which is also exhibited. The development of these dorsal 

 ridges or tubercles in the Cerambycid larvae, so as to become a.ids 



FIG 23. Ob:rea schaumii : , larva ; &, head of larva from above ; c, labium 

 and maxillae of larva ; d, pupa (original). 



to locomotion, within hollow stems or burrows, is easily under 

 stood, because the larva? of the whole family are characterized by 

 having a series of dorsal plates more or less distinctly armed with 

 hairs or spines and medio-dorsally divided, which aid in the move 

 ments within their burrows. It is evidently incorrect to call these 

 abnormally developed tubercles prolegs, as they have none of the 

 structures w r hich distinguish the true prolegs from the various 

 bulgings or tubercles which occur, whether ventrally, laterally, 

 or dorsally, in sundry Coleopterous larvae, and which, in some 

 cases, as I have shown in the larva of Colaspis, become special 

 ized appendages. 



[T'ranscrtpt from Note-book.'} 

 No. 118 CERAMBYCID LARVA IN COTTONWOOD STEMS {Oberea scJiaumii 



Lee.) 



Found May 26th, 1867. Length o. 76. Color deep butter-yellow. Head 

 slightlv darker and jaws and mouth-parts black. Stigmata brown. Per 

 fectly cylindrical and of the same diameter throughout, with the exception 

 of first and last segments. Insections broad and deep. Head and mouth- 

 parts protrude considerably forward and are characteristic. Makes a very 

 smooth, cylindrical burrow, straight and lengthwise of the limb, the cast 

 ings being of a deep reddish brown. Found in branches of small cotton- 

 woods on north side of the city (Chicago). 



June 6th. Found more of them to-day, mostly in the pupa state. They 

 probably live two years in the tree, as I found two sizes, the smaller meas 

 uring about .33 inch, otherwise being the exact counterpart of the mature- 

 worm. At the entrance where the larva was first hatched a rough, knotty 

 incision is always found, and during the first year of its growth the larva 

 does not enter the centre of the tree, but keeps on one side, just within the 



