1904.] 245 



D. prcetextatus Hal. is a lost species, which must come uear 

 Hercostomus according to its description. Haliday described aud 

 figured it in Nat. Hist. Eev., ii, Proc, p. G3 (1855) from " A. single 

 specimen found among the sea reeds on the sandhills of Rossbegh 

 Point (Kerry) in July," but it has never been recognised since. It 

 has pale postocular cilia, wholly black antennic, and pale fringed 

 squamaj, but cannot be ££. (/racilis, because it has a silvery-white face, 

 cinereous coxa), aud "Tip of wing with narrow black edge." It 

 cannot be one of our known species of Gt/mnopteriius, because it has 

 pale postocular cilia, but it might be a Poecilobothrus. 



{To be continued). 



HELP-NOTES TOWARDS THE DETERMINATION OF BRITISH 

 TENTHREDINID.E, &c. (11). 



BY THE EEV. F. D. MORICE, M.A., V.-P.E.S. 



{Continued from page 176). 



NEMATIDES {CLADIUS TO DINEURA). 



The first five Nematid genera adopted by Konow differ from all 

 the rest in having the humeral area (" lanceolate cell ") not " petiolate " 

 but "contracted." On this ground Thomson excluded them from the 

 great genus Nematus, in which he allowed all their allies to remain. 

 And it may simplify matters if, before attempting to tabulate our 

 more normal genera of British Nematides, we clear the ground by 

 dealing first with these aberrant members of the Tribe. 



As they do not, in all, include a large number of our species, a 

 single Synoptic Table may suffice for the whole of them, as follows : — 



BRITISH NEMATIDES WITH "CONTRACTED HUMERAL AREA." 



1. Both medial nn. received in the same cubital cell 8. 



— The two medial nn. received in different cells 2. 



2. Antennae of i pectinate (J. e., joints 3 to G each with a long slightly curved 



process branching outwards from its apex). Antennae of ? with the post- 

 basal joints, especially 3 and 1, much compressed and dilated (about a third 

 as broad as long), obliquely truncated at the apex, and contrasting strongly 

 with joints 8 and 9, which are quite simple and slender. (The post-basal 

 joints, though so much broader, are but very little longer than the apical 

 ones ; hence the antennae as a whole are short and conspicuously setiform)... 



Cladius pecdnicornis, Fourcr. 



— (J antenna; never pectinate, $ anteiinre with joints near the base never very much 



dilated (many times longer than broad) ; broader, naturally, than the apical 



