TENTHIIIDINID.B. — TllICHIOSOM A. 9 



pilose, 2nd mimite, 3rd nearly half the length of the antennee, very slender, 

 2 next stoviter and shorter, equal in length with each other, 6th obconic, 

 forming part of the club, the latter completed by 2 coalesced joints ; head 

 scarcely so wide as the thorax : ocelli 3 : mandibles generally bidentate : 

 luings as in Cimbex : body robust, villose : abdomen cylindric and elongate 

 in the males, slightly natched above at the base, ovate and depressed in the 

 females : 4 posterior femora tiiickened and dentate within in the males ; 

 tibi(B furnished with a pair of obtuse spurs. 



The more densely pilose body of the insects of this genus, combined 

 with the greater slenderness of the antennae, which, as pointed out by 

 Mr. Curtis, are punctured, as well as the larger labrum, the dentate 

 thickened posterior femora of the males, the simplicity of the tarsi, 

 &c. sufficiently indicate their distinction from Cimbex : in metamor- 

 phosis they, however, resemble the insects of that genus, but they 

 appear in the imago still earlier in the year. 



Sp. 1. sylvaticura. Subwneo-atrum, abdomiiie nigro-wneo suhtus sordide luteo 

 fiisco marginato, femoribus cyaneo-atris, tibiis tarsisque luteis. (Long. corp. 

 8 lin. ; Exp. Alar. 16—18 lin.) 



Tr. sylvaticutn. Leach. — Steph. Catal. 324. No. 3742. 



Of a deep brassy black ; abdomen above with an ashy pile, beneath dull 

 luteous, margined with fuscous ; femora blue-black ; tibiae and tarsi 

 luteousj wings hyaline, slightly fulvescent, with the apex more or less 

 fuscous; mandibles red at the tip, with obsolete teeth; antennae brassy- 

 black ; labrum pentagonal. 



The sides of the abdomen are sometimes edged with luteous-red, in addition 

 to the pale under surface. 

 Not common : taken occasionally at Darenth wood and near 



Edinburgh. 



Sp. 2. laterale. Nigro-wneum, capite saturatiore, antennis nigris, femoribus 

 cyaneo-atris, tibiis tarsis ventre lateribusque abdominis luteis. (Long. corp. 

 10— 12 lin. ; Exp. Alar. 18— 22 lin.) 



Ti. laterale. Leach.— Curtis, v. \. pi. i<9.— Steph. Catal. 324. No. 3743. 



Brassy-black: head deepest; antennae black ; abdomen with a slightly ferru- 

 ginous pile, its under surface and sides luteous-red ; femora blue-black ; 

 tibiifi and tarsi luteous ; wings somewhat fulvescent, with the apex more or 

 less fuscous ; mandibles deep black, with the apex pitchy ; labrum with the 

 angles rounded. 

 Also found at Darenth wood, more abundantly than the last ; and 



occasionally at Coombe wood, in April and May. 



Sp. 3. Latreillii. JEnco-nigruni. capite antennisqiie nigris, abdoinine supra pur- 

 purascente-nigro, femoribus violascentibus, tibiis tarsisque luteis. (Long. corp. 

 9— 11 lin.; Exp. Alar. 18—20 lin.) 



