1914.] 211 



noticed till one looks for them ! Antennae long, slender, and yellowish. 

 (The genitalia of this species seem to present good characters, which 

 can often be seen even without dissection ; e.g., the so-called sagittm 

 end in long curved and pointed processes (spiniform) which, as well as 

 the broadly-rounded laciniae of the stipites, frequently project beyond 

 the apex of the abdomen) litterata, Geoffr. 



— Last ventral segment (teste Enslin !) distinctly excised at the apex, but not 



widely emarginate, as in litterata • apart from this excision it is said to 

 be " narrowly rounded." 



Otherwise usually very like litterata, but seems to be more variable in 

 colour. I am not stire that I have ever seen a British $ of this species. 

 Foreign specimens, which I take to be nassata, differ from litterata in 

 the genitalia, and also in having a great part of the impression on the 

 last dorsal abdom. segment semi-transparent and membranous (not, 

 like litterata, its extreme apex only !) nassata, L. 



(Note. — I feel no doubt whatever that the nassata of Linne really included 

 all yellow forms of Tenthredopsis. These, however, are not all conspecific j so 

 Linne's name had to be restricted, and is restricted here, as by Konow, Enslin, 

 and most recent authors). 



5. Teguhe black 9. 



— Tegulse white, yellow, or pale brown (in one species distinctly dusky, as 



compared with the paler margin of the pronotum, not however really 

 black.) 6. 



6. A large form, with little red on the abdomen, but copious yellow pictura on 



head, thorax, and propodeum (about 11 mm. long.). 



Konow referred this insect (taken at Effingham, Surrey) to tilise, Pz., which, 

 according to Enslin, cannot be separated from nassata, and shoidd therefore (I 

 suppose) have the $ thorax pale beneath. In my insect this is not so ; the 

 pleurae and breast are quite black. 



I am inclined on the whole (though doubtfully) to consider this as the 

 <J of austriaca, Knw. 



— Smaller species, 9 to 10 mm. long 7. 



7. Middle lobes of the mesonotum each marked in its inner (or posterior) angle 



with a white fleck. (This, however, is a character which must surely 

 vary ! though I can give no better one). 



A pretty species with bright lacteous (almost white) pictura, very highly 

 developed on head, thorax and propodeum. The extent of red on the abdomen 

 seems to vary. All my specimens are from Scotland, where it has been taken by 

 Mr. H. Scott and Mr. Donisthorpe. The broad yellowish band on the propodeum 

 is rather a striking character in all my specimens, but I have too few of them 

 to be sure that it is constant ? flavomaculata, Cam. 



— Mesonotum immaculate 8. 



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