TENTHllEDINID.E. — TEKTHUEDO. 73 



acute in the females : legs simple ; posterior rather elongate ; tibi(Z fur- 

 nished with a pair of longish acute spurs at the apex only : tarsi slender. 

 Although the characters, drawn from the antennae — assigned by 

 Leach to discriminate these insects from Allantus — may not, upon a 

 rigid examination of every species, appear sufficient to warrant their 

 separation into two genera, nevertheless there is manifestly too great 

 a diversity of habit between them to associate them together ; there 

 is, moreover, considerable modification in the trophi, and, amongst 

 other external differences, the clypeus is scarcely emarginated in 

 these insects, whereas in those of the foregoing genus it is in general 

 deeply notched : the true Tenthredines are very prone to vary ; — 

 they are most of them distinguished by having the stigma of the 

 anterior wings of two colours, and the middle of the abdomen fre- 

 quently red. 



A. Antennae very long and slender ; posterior legs considerably elongated. 



Sp. 1. Rapse. Supra nigra, capite thoraceque albo variis, subtus albida nigra 

 maculata. (Long. corp. 3§ — 4 lin. ; Exp. Alar. 7 — 7g lin.) 



Te. Rapffi. Linne f—Steph. Catal. 336. No. 3906. 



Above black ; antennse pale beneath ; head white^ with the crown black ; 

 thorax varied with white, the anterior portion with a white mark resembling 

 a Roman V ; scutellum arid spots behind also white ; wing scales black ; 

 abdomen above with a triangular white spot on the basal segment, and the 

 other segments occasionally with a very narrow white margin, beneath 

 whitish, variegated with Idack ; legs pale, 4 anterior with a black streak, 

 2 posterior with the femora at the apex, the tibiae and tarsi black; wings 

 hyaline, the costa pale, nervures and stigma black. 



The male is more slender, and has the hinder legs more elongated. 



Variable, some examples being more variegated with white and black than 

 others. I possess one example with only 2 submarginal areolets in the 

 anterior wings. 

 Abundant at Darenth and Coombe woods, and in other places 



within the metropolitan district, in June ; also found in Norfolk and 



in Scotland. 



Sp. 2. simulans. Supra nigra, capite thoraceque maculis, abdomine striis 

 transversis anoque albis, subtus tota Jlava. (Long. corp. 3^ — 4 lin. ; Exp. 

 Alar. 7|— 8 lin.) 



Te. (All.) simulans. Klug.—Steph. Catal. 336. No. 3907. 



Above black; antennae with the 2 basal joints pale beneath; head yellowish, 

 with black spots ; thorax black, spotted with yellowish-white, as in Te. 

 Rapae ; collar and wing scales yellowish ; abdomen with the 5 or 6 last 

 segments edged with whitish-yellow above, and entirely yellow beneath; 



