114 FOREST ENTOMOLOGY. 



winter. They deposit their eggs in small irregular clusters, and the 

 larvae move about in all directions from the mother-gallery, so that 



the markings are very irregular. These larvae 



;i ^^ j are transformed into fully developed beetles 



"%_2i Wk.^ kv early autumn, when some leave the brood- 



KLflj places, whilst others remain at the far end oi 



j^m\ V. the larval galleries for the winter and leave the 



'" Jk' Wk" following spring. 1 have kept them in con- 



JJM *}_ finement over the winter, and they worked the 



same stem as they had clone the previous 



Fig. 107. Plilceophthorus y ear> 



rhododactyius. (From The beetle (fig. 107) is about H mm. in size, 



Barbey.) \ o / 



of a dull, blackish slaty colour, with slight 

 greyish pubescence. The thorax is beautifully striated, and the 

 body somewhat globular in shape. 1 



Sub-Family DRYOOETINA. 



This is rather an extensive tribe, and as the whole of the 

 genera are practically arboreal insects, it is perhaps well to ap- 

 pend the following synoptical key, slightly modified from Fowler 

 viz. : 



I. Funiculus of antennae with four or five joints, size variable. 



i. Eyes entirely divided ; club of antennae without sutures. 

 Beetles bore directly into the woody stem. 



Trypodendron, Steph. 

 ii. Eyes entire or slightly emarginate. 



1. Elytra clothed with scale-like pubescence, and sometimes 



with fine raised hairs in addition, not excavate at apex ; 

 scutellum very small; club of antennae with distinct 

 sutures. Beetles small, generally working in thin bark. 



Cryphalus, Er. 



2. Elytra without scale-like pubescence, glabrous or with 



outstanding hairs ; club of antennae orbicular and com- 

 pressed. 



1 There appears to be some confusion as regards the nomenclature of the two 

 species of Fhloeophthorus namely, P. rhododactyius and P. Spartii. The insect 

 known abroad as P. Spartii is given by Barbey as feeding on broom, and 

 P. rhododactyius as feeding on branches of the spruce. 



