1906.] 135 



SYNOPTIC TABLE OF BRITISH AMAURONEMATUS spp. 



1. c? with the last dorsal segment of abdomen moi*e corneous and projecting con- 



siderably over the genitalia. 9 with the abdomen (viewed from above) 

 longly acuminate, being constricted gradually from about the 4th segment to 

 the apex : the saw-sheath (viewed laterally) is longer than or at least about 

 as long as the hind tibiae 2. 



— S with last dorsal segment membranous, and scarcely projecting. Apical acu- 



mination of ? abdomen shorter, commencing near the apex ; saw-sheath 

 never longer than the hind tibiae, generally evidently shorter 4. 



2. Mesopleurae polished and shining, with fine remote punctures. Abdomen with 



at least the middle segments entirely red above h'strio, Lep. 



(histrio, glenelgensis, C). 



— Mesopleurae closely punctured and subopaque. Abdomen black above, except at 



the sides and apex, its ground colour rather brownish-ochreous than red... 3. 



3. Larger species. Yertical area about as long as the scape of the antennae. Head 



subquadrate, scarcely narrowed behind the eyes fallax, Lep. 



(? hxmorrhoidah's, C). 



— Smaller. Vertical area shorter, about as long as the first joint of the flagellum. 



Head much narrowed behind the eyes mundus, Knw. 



(? lonffiserra, C, nee Thorns,). 



4. Cheeks very short, hardly as long as the first joint of the flagellum .. 



viduatus, Zett. 



— Cheeks decidedly longer 5. 



5. Head thick, not narrowed behind the eyes 6. 



— Head narrowed behind the eyes (its. sides converging almost rectilinearly)... 7. 



6. Smaller (5—6 mill. long.). Abdomen in both sexes black, with only the apex 



pale. Mesopleurae sub-opaque leucolenus, Zadd. 



— Larger (8 — 10 mill. long.). Abdomen entirely testaceous, or black only above 



(much resembling Pteronus miliari.t) Mesopleurae remotely punctured and 

 shining moricei, Knw. 



7. <? with face (clypeus, &c.) and venter white. ? . Head and thorax mostly pale 



(with black marks on mesonotum, &c.). Abdomen black above, pale on the 

 sides and beneath ; the colour green in life, but fading to a whitish- (or 

 sometimes reddish-) yellow vittatus, Lep. 



— Darker, S clypeus black, and venter more or less obscure. ? for the most part 



black, or nearly so, above and beneath, though the venter is more or less 

 streaked with whitish-yellow (also the thorax has a denser and longer 

 pubescence) 8. 



8. Smaller (6 — 8 mill. long.). Third antennal joint evidently shorter than fourth. 



Ventral apex of abdomen largely pale (yellowish) in both sexes, as are also 

 the prothorax, legs, sides of abdomen, tegulae, and stigma (at least in my own 

 specimens, though Thomson calls the stigma fuscous). Saw-sheath moderately 

 long and thick (wider, viewed dorsally, than in most species, and hardly pro- 

 jecting beyond the cerci) humeralis, Zett. 



