﻿—53— 

 NOTES ON SOME SCOLYTIDS. 



BY JOHN B. SMITH. 



During the early days of April I found opportunity to study 

 several species of ScolytidcB still in their burrows. Some of these 

 species have not yet been satisfactorily determined. To Mr. E. A. 

 Schwarz I owe the identification of species here treated of 



Chramesus icoriae Lee. 

 Quite common in Hickory twigs from three-fifths to one inch 

 in diiuiieter. The burrows are mainly in the wood and just traced 

 on the bark. The main channel made by the imago is clean, up- 

 right, usually about an inch in length, with an enlargement at one 

 side, usually at the top, but quite frequently also at the bottom, 

 enabling the parent beetle to turn in the burrow. The form shown 

 in the annexed figure is characteristic and observable in all speci- 

 mens. From each side of this 

 main gallery arise the larval 

 galleries, which are always 

 closely packed with the saw- 

 dust made by the larva. These 

 galleries vary greatly in length ; 

 some, containing a fully grown 

 larva, being scarcely a third of 

 the length of others containing 

 larvae no whit larger. They 

 start from the main gallery at 

 right angles, but usually turn 

 up or down almost immediately 

 if at either extreme of the gal- 

 lery, or as soon as they get 

 beyond the range of the preceding gallery. It is comparatively 

 rare that there is a crossing of galleries; often there will be scarcely 

 a shaVing between them. Rarely a larva will get tired of mining 

 across the grain, and will strike boldly upward or downward cross- 

 ng whatever is in the way to get a free space. When the larva is 

 fully grown the gallery is rather abruptly widened as a pupal cham- 

 ber. At this date, April, none of the larva have transformed, but 

 they have ceased feeding. The figure will show the appearance of 

 the galleries. The larva is curculionid in form, pure white, about 

 one-sixteenth of an inch in length, and with a brown, chitinous 

 head, usually retracted so as to show only the mandibles. The form 



