248 t^P"'' 



refer to the commonest variety in this country. According to the 

 descriptions of Continental authors, the 5th only is yellow all round ; 

 the 6th being black beneath. 



Mr. C. W. Dale writes me that he has a specimen of A. viduus 

 from Dover, where it was taken many years ago. It was included by 

 Curtis in his " Guide," but seemingly in error, for neither Stephens 

 in his "Illustrations," nor Smith in the B. M. Catalogue, makes any 

 mention of it. 



Tenthredo velox. Fab., would appear to be either a very rare and 

 local species, or one Avhich is confounded with some other species be- 

 longing to the same group. The Fabrician description is clear enough: 

 " antennis filiformibus apice albis, atra, ore punctoque femorali albis" 

 (Syst. Piez., 34, 24). St. Fargeau (Mon. Tenth., Ill, 323) adds to 

 this description the coloration of the legs : " f erruginei ; femoribus 

 posticis basi atris puncto albo." Hartig's description (Blattw., 312, 

 54) does not quite agree with these, for he says there is a " double 

 spot" at the base of the posterior coxse. As no complete description 

 of velox has been published, I give one now. 



Black ; clypeus, labrum and base of mandibles, a single spot over the hind 

 coxse ; the apex of the 3rd, the 4th, 5th and 6th beneath, and the 7th, 8th and 9th 

 (except at extreme apex) joints of antennae entirely, white. Legs red ; the coxae, 

 trochanters and base of femora, the apex of posterior tibise and the tarsi, the an- 

 terior tibiae behind, and the joints of tarsi in part, black ; the front tibise and tarsi 

 livid white in front. Wings hyaline ; costa and stigma black ; tegulse and pronotum 

 black. Vertex and abdomen shining ; the mesonotum opaque, punctured ; vertex 

 finely punctured, shortly pilose ; mandibles brownish at apex. 



The (J has the abdomen from the 3rd segment red ; and the whole of the femora 

 and the four anterior tibise and tarsi are broadly lined with black above. The an- 

 tennse have the apical joints black on the upper side. 



Length 4^ — 5 lines. 



The ab. nigro-lineata has all the femora and the four anterior tibire and tarsi 

 broadly lined with black in both sexes. 



It is very readily separated from the species most nearly related 

 to it (Jivida, colon, coryJi) by the white colour on the antennte extending 

 to the 3rd or 4th joints, whereas, in these, the white commences at the 

 6th ; the abdomen is always black, and the single white mark over the 

 hind coxse forms another good distinguishing point. Besides these 

 differences, livida is known from it by having the stigma white at the 

 base ; cori/li by the red on middle of abdomen ; and colon by the 

 reddish tegulse. 



The following table will enable the student to distinguish the 

 British species of Tenthredo having the apex of antennse white : 



