49. 

 TRICHIOSOMA LATERALE. 



Order Hymenoptera. Fam. Tenthredinidae Lat.., Leach. 



Type of the Gchms Tenthredo Lucorum Linn. 



Trichiosoma Leach. Cimbex Oliv., Fab., Lat. Tenthredo Linn., 

 Fab., Jur. 



AnlenncE inserted between the eyes, clavate, punctured, 7 -jointed, 

 first joint nearly globose, very liairv, second transverse, third 

 very long and slender, fourth and fifth clavate, truncate, sixth 

 dilated anteriorly, forming the base of the club which lias an 

 elevated transverse suture, (f. 1 .) 



Lahrnm quadrate, angulated at the base, rounded before and 

 ciliated, slightly produced in the centre. (2.) 

 Mandibles exserted, of the male very long, slender, acute, most 

 commonly with two teeth on the internal side. (3.) 

 Maxilla; with the external lobe corneous, the internal one mem- 

 branaceous, hairy : Palpi irregular, extending a little beyond 

 the maxillrti, composed of six joints nearly equal in length, tiie 

 fourth being the most dilated, and the terminal most slender. 

 (4.) 



Mentuni short, oblong, slightly angulated before (5. a.) : Palpi 

 a little longer than the lip, 4-j()inted, first and second joints 

 somewhat long, cylindric, third joint membranaceous, flat, 

 broad, terminal joint slender, cylindric (b.) : Lip membrana- 

 ceous, three-lobed, the centre lobe rather the smallest, attenu- 

 ated towards the ba.se. (c.) 

 Clypeus broad, slightly emarginate. Ocelli 3. Abdomen sessile, 

 villose, cylindric in the males, somewhat ovate and depressed in thefe- 

 vialcs,Jirst segment, especially of the males, slightly emarginate above. 

 Oviduct not exserted, composed of two lamellce which are serrated. 

 Superior wings with 2 marginal and 3 submarginal cells. Thighs 

 4 posterior dentated and incrassated in the males. Tibiae with siphon- 

 formed spurs, obtuse at the apex. Tarsi 5 -jointed, with the penulti- 

 mate joint a little shorter than the antepenultimate, four Jirst joints 

 with small membranaceous appendages, dentated beneath, especially 

 the Jirst joint of the males. Claws simple (Q fore leg of a male). 

 Larva with membranaceous feet. 



Laterale Leach Zool. Mis. v. 3. p. 109. n. 2. 



/Eneous black covered with soft yellowish hairs. Head and 

 antennae very black ; sides and underside of abdomen, tibiae, 

 tarsi, and costa, yellow inclining to ferruginous. Wings stained 

 with yellow, posterior margin fuscous. 



Li the Author's and other Cabinets. 



The Genus Trichiosoma was established by Dr. Leadi in his 

 valuable Monograpli upon the Tfnthrcdinidcv : it is closely 



