234 [October, 



sequence — at any rate they are of rare occurreni-e in collections ; and 

 of one {consohrinus) I have only seen or heard of a single British 

 example — a $ most kindly presented to me hy Mr. Bloomfield. They 

 are really, however, quite distinct from Allantus in the structvire of 

 the head, the eyes being small, separated from the mandibles by long 

 " genoe " and (n.b.) lying well outside the base of the clypeus, while in 

 AUanhiH the reverse is the case (the clypeus extending outwards 

 beyond the inner margins of the eyes). The stigma, too, in A. arcuatufi 

 is wliolly pale, while in Sciopteryx it is at least black at the apex. 

 Both our species have the clypeus excised not very deeply, but sharply, 

 and somewhat angularly, throughout th.e whole breadth of its pro- 

 jecting apex, and the latter almost hides the mandibles beneath itself 

 when they are closed. 



The species are easily distinguished as follows : — 



Tegiilee, costa and siib-costa (or at least the bases and apices of these veins), 

 and the stigma (except its black apex) bright straw -yelloAv. The excised 

 clypons is flat, and its apex ends on each side in a sharply defined 

 angle costnlis, F. 



Tegula; ])lack, with only a narrow white edge, costa, subcosta, and stigma 

 black (or at least fnscoiis) thronghont. Apex of clypeus somewhat 

 depressed or foveated transversely, its excision appearing less angular, 

 and its outer corners more or less roimded away consobrimis, Klug. 



There is also a slight difference in the colouring of the abdomen 

 above. In consohrinus each segment has a nearly similar and unin- 

 terrupted narrow pale edging, yellowish in dried specimens, but 

 possibly rather greenish in the living insect (which, however, I have 

 never seen, so the above is only an inference Ijased on analogy). In 

 costalis these pale margins are widely interrupted, in fact almost 

 entirely obliterated on the Imsal segments, but towards the apex they 

 begin to appear, first as lateral streaks, and then as continuous bands, 

 growdng wider and wider, till they almost cover the segments 

 altogether. 



Bhogogastera (better, as originally, Rhogogaster), Knw. — The 

 species of this genus are placed by Mr. Cameron in Tenthredo, by 

 Thomson and Andi-e along with Tenthredojjsis in Perineura. Neither 

 arrangement is at all satisfactoiy, and the only doubt is whether 

 Konow went far enough in creating a single new genus only to receive 

 them. That genus was originally pubhshed as Rhogogaster, a name in 

 my opinion perfectly unobjectionable ; but the author was induced by 

 a friend on whose authority in philological mattei's he was accustomed 



