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Show 86 INSECTA. 0 b Geofl'. C IMBEX, Oliv. Fab.- ra ro, • • d f h m when 1rr1tate r t Some o t e . The larvre h ave but twenty-thw o s1iedee s· of the.i r b 0 dy to the dtstance spurt a greenish liquor from t e . of a foot. . to the number 0 f J· o in ts an tfe rtohr Dr Leach( l ), by hav~ng recout s~ ns and the arrangement o t e l lub their relauve proportto c· hex into several others, to t 1e c ' . . d th genus 1m . d' · cells of t h e w ings ' has d1v.1 de el iar to New I::J1" .0 Iland ' and 1s tstt m· one of which, PERGA(2), 1S pecu llowing cha~acters .. T.he ~ur gut. she d f rom all the others b1y thein efo on the rot'd dle of then· mfertor posteri.O r tibire have a m. ovab e spd square, w1' th its posterior angle.s 'd The scutellum IS large an Th lves that sheathe the ovt· si e.. . l·n the form of tee th . e va s short and f ri.z z1 e d proJectmg 11 'th numerou ositor are covered externa y hw~t and have six joints, the last of ph . The antennre are very s o . f annuli as in SYZYGONIA, a~rs. . . h t ny vestq;es o T which, or the club, IS wit ~u a some s ecies from Brazi1(3). he a genus established b~ Klug on d the;e are four cubital cells, the radial cell is appendtc~lated, a~ each a recurrent nervure-the d d third of which receive, ' secon an d' k transverse nervures of the IS • ·n an excellent Monograph of the M. Lepeletier de St Fargeau, 1 p ga and in conjunction with Tenthredinetre, on 1y a d op ts thfe hg enEuns liesrh n' aturalist as s.t rop l e d' . lVI· him we will consider those o t e g sions of Cimbex. . 1 t that number in which the The two following species be ong o fi . oints before the club. ... antennre have ve J l L • De Geer, Insect., II, xxxm, s- O. lutea; Tenthredo utea, ·' , 11 • abdomen . h ·In length. brown; antennre } e ow' 16• About an me ' yellow, with violet-black band~;l is of a deep yellow, with a The larva, or pseudo-caterpl l ar, the back On the Willow, blue stripe, edged with black a ong . Birch, &c. (1) Zool. Miscel., III, P· 100, et seq. T th. d p 40. . .. L 1 Monog en I e . ' . (2) Ibid., 116, cxlvm; epe ., . k 171 he gives the characters ( 177· in the same wor ' P· , . f 3) Monog. Entom., P· ' . . B "1 The antenn~ conslsto h lo t"ot lso pecultar to raz1 · of another genus Pac ~ s L .a' a d"l ted near their extremity, and the callo~ five joints. The superlor wmgs ar~. ~a d fourth joints of the posterior tal'SI point is semilunar. The second, t Ir ~n are very short. He mentions thre; :~=c~:~is of the wings and the spines of the The genus Perga, on account o posteri.O r t"1b "1a , should come directly before Hylotoma. HYMENOPTERA. 87 C. femorata; Tentltredo femorata, L.; De Geet·, Insect., II, xxxiv, 1-6. Large; black; antennre and ovipositor of a brownyellow; blackish-bt·own spots on the posterior mar·gin of the superior wings; posterior thighs very large, in one of the sexes at least. The larva lives also on the Willow; it is green, with three stripes on the back, that in the middle bluish and those on the sides yellowish( l ). Those species, in which the antennre present but three very distinct joints, the last of which forms an elongated, prismatic or cylindrical club, more slender, ciliated and sometimes forked in the males; and where the two costal nervures of the superior wings are very remote from each other, constitute the subgenus HYLOTOMA, Lat. Fab.-Cryptus, Jur. Some-SoHYzooERA, Lat.; Cryptus, Leach, Lepel.-have four cubical cells, and the antennre forked in the males. The middle of the tibire is destitute of spines(2). Others-Hylotoma properly so called-similar to the preceding in their wings, have their antennce terminated in both sexes by a simple or undivided joint. Most of them-Hylotomes, Lepel.-have a spine in the middle of the four posterior tibice. The larvce or pseudocaterpillars have from eighteen to twenty feet. H. . roai13; Tentltredo rosre, L.; Rres., Insect., II, Vesp., II. Four lines in length; head, top of the thor·ax, and exterior margin of the superior wings, black; remainder of the body saffronyellow; tarsi annulated with black. The larva is yellow, dotted with black; it gnaws the leaves of the Rose-tree. M. Lepeletierreunites to the Cryptua, Leach, certain species which only differ from the preceding ones in the absence of spines on the middle of the four posterior tibire. Other Hylotomre, distinguished by the same negative character, but which have but three cubital cells, form his genus Ptilia(3). (1) For the other species, see Oliv., Encyc. Method., article Cimbe:c; Fab.; Lat., Gen. Crust. et Iusect., Ill, p. 227; Jurine, genus Tentltredo1 Panz., Hymen.; and the works already quoted. (2) Leach, Zool. Miscell., III, p. 124; Lepel., Monog., Tenthred., p. 52. (3) Lepel., lb., p. 49. For the other species of Hylotom~, see the same work~ the preceding one of Dr Leach, and the Monograph of the various genera of this family by Kliig. |