1906.] 247 



sulci or carinae. The ? saw-sheath also (viewed from above) is very 

 characteristic. This is wide, and consists — or at least gives that 

 impression — of two somewhat "dehiscent" lobes, each armed 

 apically with a brush of longish bristles— easily distinguishable from 

 anything to be seen in the other normal Nematids. The complete 

 or partial obliteration of the first cubital nervure (though often 

 supposed to be the chief distinguishing mark of a Prist iphora) is not 

 really a character of great importance. It appears also regularly in 

 some species of LygcBoneinatus, and is not universal in Pristiphora, 

 This particular nervure is quite commonly pale or altogether obsolete 

 in particular species of several genera (i.e., PoeciJosoma) as well as 

 exceptionally in individual specimens of saw-flies belonging to almost 

 any species of any genus. 



All the eleven species of Pristiphora which J am able to tabulate, 

 except conjugata^ are known to me from British specimens in my 

 own collection. Of that 1 have only one specimen, a foreigner ; but 

 it is recorded bv Mr. Cameron from Glasgow, and his description 

 satisfies me that he has identified the insect correctly. Eight of the 

 above species appear in the Monograph under the names by which, 

 following Konow, I have called them. Another (pallipes) is Mr. 

 Cameron's appendiculafus. Two (melanocarpa and viridana) I cannot 

 identify for certain with any spec'es in the Monograph, though the 

 former {=■ puncficeps, Zadd., nee Thomson) is perhaps Mr. Cameron's 

 puncticeps. >ubhifida for some reason is treated in vol. iv of the 

 Monograph as not a Pristiphora but a Pachynematus : the descrip- 

 tion, however, in vol. ii clearly indicates the present genus. In vol. iv 

 we get a list of fifteen British Pristiphora spp. But of these Konow 

 considers fletcheri and nigricollis to be synonyms of crassicornis, and 

 refers ohlongus^ C, to Lygceonematus (probably also fmierulus and 

 laricivorus). As to ahhreviatus, C, I can offer no suggestion, and 

 naturally cannot " place " it in my Tables. 



SYNOPTIC TABLE OF BRITISH PRISTIPHORA, spp. 



1. Ventral surface of abdomen black 2. 



— Ventral surface of abdomen largely pale or testaceous 6. 



2. Antennae entirely black 3. 



— Antennae more or less pale or rufescent, at least beneath 4. 



3. Hind femora black melanocarpa, Htg. 



— Hind femora (as are the legs altogether) yellow .fulvipes, Fall. 



4. Wings slightly (often hardly appreciably) clouded below the stigma. S antennae 



red, thick, much compressed, ? with hind femora and tarsi generally quite 

 black, or nearly so. Body black, legs black and white. Extremely like 

 the two following species, but as a rule rather larger and darker... 



crassicornis, Htg. 



