146 ALLANTUS MARGINELLUS, 



The S has the labrum, clypeus and mandibles at the base yellow 

 the mark on the pronotum is smaller ; there is only a thin yellow band 

 on the fourth abdominal segment ; the anterior tibiae and tarsi are 

 yellow in front ; the hinder pair have only the knees yellow, and the 

 posterior tarsi are thickened and fuscous in the middle. The last 

 abdominal segment and the anal appendages are yellow. In one aberra- 

 tion the scutellum is black and the pronotum without any yellow. 



Length 5| 6 lines. 



Ab. a. The fourth and fifth segments each with a 

 broad yellow band ; the posterior tibias dull yellow to 

 beyond the middle; the apex of hinder tibias and all 

 the tarsi fuscous (Deal, F. Smith). 



Ab. b, As in a, but the yellow more developed ; a 

 distinct yellow mark on lower part of prothorax, and 

 one beneath fore wings (in Shuckard's collection). 



The typical marginellus is stated to have the first, 

 fourth, fifth and apical segments yellow, but this is not 

 a constant character; indeed, Thomson describes the 

 first to ninth segments as yellow in the middle ; and in 

 some continental specimens (Germany) which I have 

 the five apical segments are broadly banded with that 

 colour. The band on the fifth segment is often absent, 

 or it may be divided in the middle, the sixth may be 

 entirely black ; the yellow on the scutellum is not 

 unfrequently divided in the middle, or it may be 

 absent ; a small yellow spot is sometimes seen on the 

 hinder edge of the pleurae, while the posterior tarsi 

 may be black, fuscous, or coloured like the tibia3. 

 Judging, too, from the descriptions, the c? must vary 

 considerably. 



This insect comes nearest to 3-cinctus, but is 

 smaller, the punctation is not so rugged ; scutellum 

 is smoother and yellow; labrum piceous, not black; 

 the incision in the clypeus is deeper ; the femora bear 

 more black ; while, most noticeable of all, the wings 

 are not blackish at the apex. 



It agrees with cingulum in having the hinder tibiae 

 and tarsi more or less reddish, but its labrum is fuscous s 

 the incision in the clypeus is very much shallower, the 

 puncturing on head and thorax deeper, and they are 

 not so shining, the scutellum bears two yellow spots, 



