of New Insects from New Holland. cxxxi 



out attempting a separation, an observer is so liable to be mistaken, that I will not 

 venture to express an opinion ; the third is long, slender, and slightly arcuate ; the 

 fourth shorter ; the fifth still shorter and bearing a small fascicle of black hairs on 

 one side at its apex ; the rest decrease in length ; all the joints have a thin fringe of 

 hairs on one side, they are black, with the exception of a small portion at the base of 

 each which is gray : the head and prothorax are black, with scattered gray hairs, the 

 latter has a strong and sharp central tooth on each side, and three small obtuse 

 tubercles on the base, the middle one of which is nearest the hind margin and unites 

 with a small ridge which passes between the other two : the elytra are manifestly 

 wider than the prothorax, and ample, extending beyond the abdomen; they are 

 rounded at the apex, coarsely and deeply punctured, black, and variegated with irre- 

 gular markings, due to a short, velvety, gray pilosity, they have two short ridges at 

 the base, one originating at the humeral angle, and the other half way between that 

 and the scutellum : the legs are moderate, the femora being decidedly, but not abruptly, 

 incrassated. 



Hab. — Van Diemen's Land : a single specimen in the cabinet of Mr. Westwood, 

 to whom I am indebted for the opportunity of describing the species. 



The occasional numerical reduction of the joints of the antennae of certain Lami- 

 idae has already been noticed, but whether this peculiarity is incident to one sex only 

 I am unable to say, never having seen a series of any species, the antennae of which 

 were uniformly 10-jointed. The well-known Brazilian species, Lamia scopifera, de- 

 scribed by Germar, in 1824, in the first volume of his Ins. Nov. Spec, p. 476, which was 

 raised into the rank of a genus by Audinet-Serville in the * Annales de la Societe En- 

 tomologique de France,' iv. 79, has the antennae 11 -jointed in the male and only 

 10-jointed in the female, and it is by no means impossible that the numerical reduc- 

 tion in the instance before us applies only to one sex. 



Genus — Isosceles, Newman. 

 Isosceles pigra. 



Piceo-nigra, puncta, pilis lanugineque canis obsita, elytra fusca profunde ac confertim 

 puncta, prothoracis latera vitta vix distinctd cano-lanuginosd ornata. (Corp. long. 

 *3 unc. Elytrorum lat. max. "05 unc. 



Face rather convex, its direction more than prone, antennae moderately distant 

 seated on prominences more than half as long as the body, ll-jointed, slender, the 

 basal joint rather stout ; the second as usual short and small ; the remainder longer, 

 but gradually decreasing in length and substance ; the longer ones individually 

 slightly arcuate : prothorax nearly cylindrical, scarcely so wide as the head, its lateral 

 margins perfectly straight: elytra linear, rather wider than the prothorax, longer than 

 the abdomen, obliquely and arcuately truncate, the angles of the truncature rather 

 acute : legs uniformly short, mesotibiae with the distinctive Lamiate notch. The 

 colour is pitchy-black, the elytra approaching to brown, all parts are punctured, the 

 elytra deeply and con fluently : every part is also sprinkled more or less abundantly 

 with gray hairs or down, the latter forms a line on each side of the prothorax : this 

 pilosity is somewhat silvery on the tibiae : the extremity is furnished with a pencil of 

 longer black hairs. 



