S1REX GIGAS. 135 



9 (8) Patellae indistinct. Antennae black. Melanocerus. 



10 (5) Body black ; abdomen more or less yellow. 



11 (12) Posterior tibiae with the apical half black. Augur, F. 



12 (11) Posterior tibiae without black. 



13 (14) The second to fifth abdominal segments black ; meso- and 



meta-thorax entirely black ; sides of pronotum very rarely 

 marked with yellow ; femora for the greater part black. 



Gigas. 



14 (13) Fourth to sixth abdominal segments narrowly banded with 



black ; pronotum and metathorax yellow ; femora scarcely 

 marked with black. Fantoma. 



Males. 



1 (2) Hind tibiae with one spur. Sides of pronotum testaceous. 



Spectrum. 



2 (1) Hind tibiae with two spurs. Pronotum without testaceous. 



3 (6) Head and thorax black. 



4 (5) Head entirely testaceous behind the eyes. (Sometimes the 



entire body is yellowish.) Augur. 



5 (4) Head not entirely testaceous behind the eyes. Gigas. 



6 (3) Head and thorax blue. 



7 (8) Eighth abdominal segment reddish in centre above. 



Juvencus. 



8 (7) Eighth abdominal segment blue. Melanocerus. 



1. SlEEX GIGAS. 



Yol. II, PI. VII, fig. 6, ? ; 6 a, Ovipositor ; 6 b, Top of 

 Sheath; 6 c, Apex of Borer; 6 d and e, Last Ab- 

 dominal Segment; 6/, Trophi. Vol. Ill, PL IV, 

 figs. 1212 a h, Lar. 



Ichneumon gigas, Lin., S. N., i, 560, 1. 



Sirex qiqas, Lin., F. Sv., 396 ; Klug, Mon., 31, pi. ii, fs. 15 ; 

 Ste., 111., vii, 115; Htg., Blattw., 382 ; Thorns., 

 Hym. Sc., i, 328, 5 ; Andre, Species, i. 



marisca, Lin., F. Sv., 397. 



mariscus, Lin., S. N., i, pt. ii, 929, 6. 



psyllius, Fab., E. S., ii, 124, 2. 



hungaricus, Christ, Eym., 414, pi. xlvii, f. 1. 



Black ; the head behind the eyes broadly, base and the three apical 

 segments of abdomen, antennae, knees, tibiae and tarsi, yellow ; wings 

 yellowish, darker at base. Stigma testaceous. 



The <$ has the base and apex black, the rest yellow ; posterior tibiae 

 and tarsi black, white at the base. The apical tarsal joints testaceous. 



Length 1216 lines. 



Ab. a. Pronotum broadly yellow. 

 b. Ninth segment black at base. 



