FAMILY CERAMBYCIDAE 279 



AEGOSOMA. 



With Gahan's revision of the Cerambycinae only one species of the 

 genus has now been reported as a pest, and that doubtful. 



Aegosoma costipenne, White. 



REFERENCES. White (Megopsis), Cat. Coleop. B.M. Longic. i, p. 28, pi. 2, fig. 2 (1853) ; Aegosoma lacertosuin, 

 Pa.sc. A.M.N.H. (3), xix, p. 413 (1867); I.M.N. ii, p. 12; Gahan, F.B.I. Ceramb. i, no. 45, p. 49 

 (1906). 



Habitat. Kulsi, Assam. Gahan gives Assam ; Sikkim ; Manipur 

 (Doherty). 



Tree Attacked. Teak (Tectona grandis). Kulsi Teak Plantation, Assam. 



Beetle. $ Ferruginous red and opaque, the elytral costae 

 nitid and of a brighter red colour. Upper surface bare of 



pubescence. Antennae a little longer 



Description. than body, the third and a few of 



following joints tipped with black at 



apex, third rather more than twice as long as first. Prothorax 

 with a sharp angular process at the base on each side ; 

 unarmed at the anterior angles. Elytra each with four costae, 

 the outer one reaching the apex, whilst a second nearly 

 does so, the remaining two being short ; apex subtruncate 

 near suture, armed with a short spine at the suture. 



$ Antennae reaching to posterior third of elytra. Pro- 

 thorax with a reddish callosity occupying space between the 

 prosternal suture and the lateral edge. Ovipositor short 



and compressed. (Descr. after Gahan.} Length, 25 mm. to Aegosoma costipenne, White. 

 30 mm. ; breadth, 7 mm. to 9 mm. Assam. 



In 1890 the Forest Officer, Kamrup, Assam, reported that the young teak 

 trees in the Kulsi Teak Plantation were suffering from 

 Life History. insect attacks. Specimens previously sent to the Indian 

 Museum had shown that the insects were species of 

 Stromatium (see p. 292). The Forest Officer was asked to send further speci- 

 mens of beetles. In reply three distinct species of longicorns were sent, one 

 of which proved to be this species. The record does not state whether the 

 beetles were actually taken from the trees (I.M.N. ii, p. 12). This is at 

 present the only authority for stating that this beetle infests teak. 



Sub- Family 2. LEPTURINI. 



Head elongate and gradually or abruptly narrowed behind eyes ; 

 antennae fairly close to base of mandibles ; latter frequently provided with a 

 ligamentous fringe and molar tooth at base; front coxae conical and 

 prominent. 



Only two genera are at present known to contain species of forest 

 importance. 



