168 NEMATUS RIBESII. 



81. NEMATUS BIBESII. 



Vol. I, PL VII, fig. 7, Lar., 7 a, Pupa; 76, Eggs; 

 Vol. II, PI. II, fig. 8, ? ; PL XXV, fig. 1, Saw. ; PL 

 XXVII, fig. 6, Trophi of Larva. 



Tenthredo ribesii, Scop., Ent., 280, 734. 



solids, Fall., Acta Holm., xxix, 118, 60. 

 Nematus trimaculatus, Lep., Mon., 69, 207. 

 grossularite, Dbm., Clavis, 22. 



ventricosus, Htg., Blattw., 196 ; Toll., Tijd. Ent., ii, 



69, pi. 4 ; 1. c., 74, pi. 4, f. tf 9 ; 

 Tasch., Ent. Gart., 168, f. 43 and 

 44 ; Norton, Trans. Am. Ent. Soc., 

 i, 208 ; von Siebold, Beitr., 106 

 130 ; Kessler, Die Lebensges- 

 chichte (von) Ceutorhynchus sulci- 

 collis und Nematus ventricosus 

 (Cassel, 1866), p. 60. 



ribesii, Dbm., S. E. Z., 1848, 178 ; Thorns., Opus., 634, 



43 ; Hym. Sc., i, 143, 73 ; Cam., 

 Fauna, 38, 38 ; Andre, Species, i, 

 173, pi. x, f. 6 ; Cat., 21*; Br. and 

 Zad., Schr. Ges. Konig., xvi, pi. 11, 

 f. 7 (lar.) ; 1. c., xxiv, 342, 60 ; 

 Cam., Trans. Ent. Soc., 1880, 

 p. 76. 



Luteous ; head (mouth excepted, it being pallid testaceous), three 

 large marks on mesonotum, a large mark on breast, more or less of the 

 Bides of the pleurae, black. Legs pallid testaceous, coxse and trochanters 

 white, apex of posterior tibiae and the greater part (sometimes the whole) 

 of posterior tarsi black ; the anterior at the apex slightly fuscous or 

 black. Apex of sheath black ; antennas black or fuscous above, brown- 

 ish beneath ; sometimes the flagellum is entirely testaceous. Wings 

 hyaline, stigma black, costa testaceous at the base. 



The $ has the thorax entirely black except the pronotum ; the dorsum 

 of abdomen is black, except at apex; the sides and ventral surface 

 luteous. Last abdominal segment expanded into a projecting lobe in 

 the middle, the sides of this being curved slightly inwardly ; above 

 there is a broad and blunt keel, the segment in either side of this being 

 somewhat hollowed. 



Length 3 4 lines. 



A rather variable species, especially in the colora- 

 tion of the antennas and mesothorax. The fact, how- 

 ever, that the scutellum and metanotum are never 

 black renders its identification easy. Very rarely 



