420 Longicornia Malayana. 



Oberea. 

 Oberea, Mulsant, Hist. Col, Fr., Longicoriies, p. 194 (1839). 



Isosceles, Newman, Entom. i. 318 (1840). 

 Caput antice convexum ; tuberibus antenniferis validis, saepis- 

 sime distantibus. Oculi prominuli, profimde emarginati. 

 Antennce subfiliformes, corpore plerumque breviores ; scapo 

 subcylindrico ; articulo tertio scapo longiori ; cseteris bre- 

 vioribus. Prolhorax capite angastior, lateraliter paulo ro- 

 tiindatus. Elytra elongata, fere parallela, lateribus leviter 

 deflexis, abdomen partim tegentia. Pedes generaliter bre- 

 vissimi, aequales, vel postici aliquando paulo longiores. 

 Prosternum angustissimum. Mesosternum declive. Abdomen 

 segmentis aequalibus, ultimo in maribus saepe impresso. 

 The type of this genus, O. oculala, Linn., is one of the least 

 characteristic of the whole of the large number of species belong- 

 ing to it. Generally they have a very long and narrow body, with 

 the elytra scarcely broader than the prothorax, the latter almost 

 cylindrical, and the posterior legs not passing beyond the middle 

 of the abdomen, but in O. oculala none of these characters hold 

 good ; it is the stoutest of the genus, and offers a marked contrast 

 in those respects with most of the species. Nevertheless there is 

 a gradual passage between this and the slenderest of the forms, 

 like 0. acicularis or 0. ophidiana. . Mr. Newman's genus Isosceles, 

 is in nowise distinguishable; it was probably formed at the same 

 time as M. Mulsant's, but the latter author has priority of date, at 

 least on his title page. M. James Thomson, in adopting it, dif- 

 ferentiates it on the ground of the antennae "longer than the 

 body," but this is a purely arbitrary distinction in such a group 

 as the present. The genus has its head-quarters in Borneo, 

 whence it radiates to Java, New Guinea, the Philippines, and 

 Mantchuria; it is represented by nearly a dozen species in 

 Europe, a few in North America, but none in Africa beyond the 

 desert, or in Australia. The species frequent plants, nestling 

 among the leaves, and fly slowly and in an undulating manner. 



§ Apices of the elytra narrowly emarginate. 

 Oberea brevicollis. 

 O. capite prothnraceque brunneo-rufis, hoc transverse; elytris 



nigris, subnitidis, basi multo latioribus. 

 Hah. — Sarawak. 

 Robust ; head and prothorax dull red, the latter broadly trans- 



