TENTHREDINID.E. JANUS. 10^ 



Sp. 10. immaculatus. Niger, nitidus, immaculatus, tihiis tarsisque anteriorihus 

 testaceis. (Long. corp. Sg lin. ; Exp. Alar. 5 lin.) 



Ce. immaculatus. Steph. Catal. 341. JVo. 3991. 



Shining black: mandibles yellow at the base; abdomen totally immaculate; 

 femora black, the anterior at the tip, with all the tibite and the anterior tarsi 

 testaceous, the intermediate tarsi and the posterior tibiae at the apex 

 fuscous, the hinder tarsi black ; wings subhyaline, fuscous, with the nervures 

 and stigma darker. 

 Taken, in June, near Bristol. 



Sp. 11. pusillus. Ater, nitidus, abdomine piceo, segmentis 5 ei 6 lined utrinque 

 anoque Jlavis, femoribus rngris, tibiis tarsisque Jlavo testaceis. (Long. corp. 

 2| lin.; Exp. Alar. 4i lin.) 



Ce. pusillus. Steph. Catal. 341. No. 3990. 



Shining black : antennae testaceous at the apex, especially beneath ; mandibles 

 testaceous at the tip ; palpi pitchy ; thorax immaculate; abdomen pitchy- 

 black, with an elongate streak on each side of the 5th and 6th segments, 

 and the terminal segment yellow ; femora black, the anterior in front, 

 intermediate at the apex, and all the tibiae and tarsi testaceous-yellow ; the 

 hinder tarsi brownish above ; wings hyaline, with the nervures and stigma 

 fuscous. 

 Found, but very rarely, in the neighbourhood of London in June, 



and also at Bristol. 



Genus XXX.— JANUS mihi. 



Antennce rather long and filiform, consisting of numerous articulations, basal 

 joint robust, subglobose, 2nd rather smaller, globose, 3rd longer than the 

 4th, which is slender and elongate, 5tli rather shorter, 6th and following 

 gradually diminishing in length and thickness, terminal one obtuse : palpi 

 unequal ; maxillary with the penultimate joint very short, inserted eccen- 

 trically, the apical one slender and acute : mandibles bidentate : head rather 

 small, subglobose, a little produced in front : ocelli 3 : collar moderate : 

 wings long and broad ; anterior with 2 marginal areolets, the basal one 

 elongate-quadrate, placed obliquely, the apical one elongate-lanceolate- 

 acute; and 4 submarginal areolets, the 1st irregularly triangular, 2nd 

 elongate triangular, receiving 2 recurrent nervures ; the 3rd subquadrate, 

 receiving 1 recurrent nervure; the 4th larger, extending to the apex: 

 abdomen short, narrow at the base, and dilated at the tip, which is obtuse 

 and rounded in the males, slightly compressed and acute in the females, 

 with a short exserted ovipositor: legs slender; hinder pair stoutest and 

 elongate ; 4 posterior tibi(E with spurs in the middle. 

 The long filiform antennae of the insects I have included in this 

 genus, combined with the difference in the structure of the trophi, 

 and the dissimilarity of the areolets of the wings, the abbreviated 



