234 [October, 



hardly noticeable very narrow and interrupted black streak at the base of each 

 segment ; the antennae and legs are also mostly orange. The insect is common 

 in collections, and I have often taken it myself, sometimes i.e. with one or 

 other of the ? forms ; it is therefore surprising to me that in his Vol. iv 

 Mr. Cameron says that he has never been able to recognise it among his own 

 specimens. The colour alone will generally distinguish it from anything else, 

 but it has also a good structural character (which is easily found if looked for 

 properly) in the form of the savicer-likc apical ventral segment. If the insect 

 is held belly upwards, and the apex of its aljdomen tiumed to face the lens, a 

 distinct (almost semi-circular) incision or emargination in its outline can, after 

 a little practice, be recognised without diificnlty, though it requires some 

 management to get the object exactly into the right position. I have before 

 me British ? specimens i-epresenting 6 colour-varieties of the species, which 

 may be tabulated as follows. (The varietal names are those adopted in 

 Konow's Tableau Analytique) . 



1. Abdomen black at base and apex, red in the middle. Legs red.... 



var. typ. thomsoni, Knw. 



2. Abdomen black at base only, red at apex. Legs red... 



var. cordata,, Fourcr. 



<| 3. Like cordata, but legs in great part black var. femoralis, Cam. 



4. Abdomen entirely black. Legs red var. microeephala, Lep. 



5. Like mierocepliala, but hind legs black var. ealiginosa, Cam. 



6. Abdomen orange (much as in the ^ , but with larger and less definite 

 (^ and regular black markings) var. eoneolor, Knw. 



Of the i , as has been said, there seem to be no coi-responding colour- 

 varieties. But should such occur, the emargination of the last ventral plate 

 would no doubt be found to distinguish them. 



2. T. eoquehertii* Klug. Of this species the ^ may be known at once by 

 the circumstance, pointed out (n.b.) in the aiithor's original description, that it 

 alone of all our Tenthredopsis ^ J has its lower wings neurated as in the 9 , i.e. 

 without what I have called elsewhere (Ent. Mo Mag., 1903, p. 53. Fig. 6), 

 " Continuous external neiu-ation." Unfortunately the 9 has no corresponding 

 character, as indeed of course it could not ! 



Coquebertii $ varies a good deal in the colour of the abdomen, which may 

 be practically black throughout, or more or less distinctly red-banded. The 

 head and thorax are black, always marked to some extent, but often rather 

 scantily, with white or whitish-yellow (clypeus, scutelkim, cenchri, &c.). The 

 tegulaj, I believe, are black always. But whatever its colour, the alar neura- 

 tion will distinguish it from any British ^ of the genus known to me. 



The 9 seems pretty constant in colour. The head and thorax are black 

 with more or less of whitish markings like those in the 9 • The abdomen is 

 black at base and apex with a broad red band, occupying usually about four of 

 the intermediate segments. (This band is occasionally, but not often, inter- 

 rupted by a black line or series of spots, running longitudinally down the 



* Konow wrote the name coqueberli, but I spell it a.s Klug did. 



