454 



FAMILY CURCULIONIDAE 



CONARTHRUS. 



Conarthrus affinis, Woll. 



Habitat. South Coimbatore, Madras. 



Tree Attacked. Dendrocalamus strictus. Mount 

 Stuart, South Coimbatore. 



Beetle. Elongate, narrow ; shining black, punctate, legs rufous 

 brown. Head prominent, about same length as rostrum, very 



shining punctate ; rostrum stout, flattened, 

 Description. broadest anteriorly, wheie it swells into a 



blunt knob ; finely punctate ; the scrobes 



commence slightly above centre and run backwards obliquely to 

 near the eye ; antennae inserted near base of anterior swelling. 

 I'rothorax shorter than head and rostrum together, truncate at upper 

 and basal ends, widest just above base, sides rounded, rather coarsely 

 punctate. Elytra elongate, parallel, but slightly wider than pro- 

 thorax at base, constricted and depressed apically, the sides bent 

 downwards, covering a portion of the lower surface of abdomen ; 

 strongly striate-punctate. Length, 5,3 mm. 



This insect tunnels into the nodes of the Dendrocalamus bamboo 



for ovipositing purposes. A generation was discovered 



Life History. thus occupied in the South Coimbatore forests at the 



end of July 1902. The beetle tunnels into the node, 



and then carries the tunnel either up or down in the wall of the bamboo. 

 In some instances the tunnels are carried horizontally round the circum- 

 ference of the wall. The tunnels are long, the eggs being deposited 

 amidst some wood-powder near the bottom of the tunnel. The beetle 

 attacks half-dead and dead bamboos, riddling the wood to powder when the 

 insect is in numbers. 



Conarthrus jansoni, Woll. 



FIG. 299. 

 Cojiarthrns affinis, 



Woll. 

 South Coimbatore. 



Habitat. Goalpara, Assam. 



Tree Attacked. Sal (Shore a robusta}. 

 Goalpara. 



Anguri Block, and Kachugaon, 



Beetle. Elongate, narrow, parallel. Shining black, punctate. 

 I lit: rostrum is long, swollen anteriorly ; scrobes commence well 



forward, are short and deep, and do not 

 Description. extend backwards to the eye. Prothorax 



elongate, convex, broadest at middle, the 



sides curved ; uniformly and finely punctate. Elytra as wide as 

 broadest part of prothorax, constricted and depressed apically, 

 leaving a small portion of the pygidium disclosed. Strongly striate- 

 punctate. Under-surface black, shining, punctate. Legs ferruginous 

 brown. Length, 6 mm. to 6.3 mm. 



Vic,. 300. 



A number of specimens of this beetle were found 

 'hrnsjansoni, tunnelling into felled and partially dry sal-tre^s at 

 Woll. Coalpara, Assam, the end of April 1906. The insects were tunnelling 



