9474 Insects. 



jaws are bidentate at the apex. The thorax, together with the costal 

 margins of the wings, the apical segments of the abdomen and the legs 

 are very finely hirsute. All individuals have a black horny spot in the 

 centre of the second submarginal cell, and in some a similar spot 

 occurs in the first submarginal also. 



Lyonet has submitted this species to an exact anatomical exami- 

 nation, as regards the parts of the mouth, the legs, and the saw and 

 ovipositor of the female; his description occupies eight quarto pages, 

 while the whole of plate 14 is dedicated to the delineation of the 

 various details, the figures being in most cases enlarged. (We feel 

 called upon to remark that, although there is no reasonable doubt 

 that Lyonet really dissected and described our aterrima, his 18th 

 figure represents a head with eight-jointed antennae, whilst the text 

 speaks of " sept articulations." In transferring the drawing to the 

 copper the first two small joints may have been run into one larger j 

 one, but how are we to explain the erroneous statement in the text 

 in the case of so accurate a describer as Lyonet .?) 



If we look at the short and thick form of the body and at the 

 neuration of the wings, we should be inclined to place this species in 

 the genus Selandria of Leach ; if we look at the antenna; in both 

 sexes, we shall rather feel obliged to find it a place in the genus 

 Cladius ; and if we regard the parts of the mouth we find it to differ 

 from both. It then appears to me to be most convenient, after the 

 example of that acute observer, Dahlbom (Conspectus Tenthredinura, 

 Sirie, &c.), to place aterrima in a separate genus, which he has named 

 Phymatosoraa. 



As far as our own observations go, this species has, as a rule, but 

 one brood in the year : it is found in various parts of the country. 

 According to Klug, it is taken in different parts of Germany; for 

 example, in the neighbourhoods of Berlin, Gottingen and Garz, in 

 Poraerania, also in Silesia and Hungary. No parasites have as yet 

 been reared from it. 



Nematus Salicis, L. 

 J. Goedaert, Metamorph. Natur. vol. i., description xix. p. 58. 

 LintKEiis, Faun. Siiec. {^nd ed.) 1572. Hartig, Blall-und 

 Hohwespen, p. 194. Ratzeburg, Forstins, vol. iii. p. 125, 

 No. 31. Brischke, Blattwespenlarven , p. 6, pi. 1, f. 2. 



Nematus fiavus, antennis, macula frontali, mesothoracis dorso, 

 macula media pectorali, costa et stigmate alarum nigris ; tarsis 

 posterioribus fuscis. 



