170 Exiilanation of Plates IV and V 



Fig. \ t. Ovipositor in its sheath of another specimen, from below; x 21. — «. sheath; h. ovipositor, 

 indicated with dotted lines ; y. gland to the sheath ; md. musculi dilatatores of the sheath ; 

 mr. musculi retractores ; ms. muscular stratum on the sheath. 



Fig. 1 u. Ovipositor, from above ; x "29. 



Fig. \ v. Distal part of ovipositor, from above: x 72. — -f. forceps; ii. nerve; j^. branched process: 

 a kind of tactile organ. 



Fig. 2. Siro rubeng Latreille. 



Adult male. 



Fig. 2 a. Body, from above, x 1 9. 



Fig. 2 h. Middle portion of the anterior half of the body, from below ; x .53. — c. mandible ; 

 (/. terminal face of its pars manducatoria ; /". angle limiting the stomotheca in front ; lex'. 

 maxillary lobe of the second pair of cox* ; m. arculi genitales. 



Fig. 2 c. Distal part of the first left walking leg, from the outer side ; x 40. 



Fig. 2 d. Distal part of the last left walking leg, from tlie outer side ; x 40. 



Fig. 2rf'. Process on the upper side of the tarsus shown in the preceding figure and more highly 

 magnified. 



Fig. 3. Siro duricorius Joseph. 

 Male and female. 



Fig. 3 a. Front margin of the cephalothorax of the female, from above : x 1 23. — s. sensory setse. 



Fig. 3 b. Terminal face of one of the coni foetidi, showing the thin-skinned area with the fissure 

 which is the opening from the odoriferous gland; x 215. 



PLATE V. 



Fig. 1. Siro duricoritts Joseph (continued). 



Male and female. 



Fig. \ a. Male, from above; x 17. 



Fig. 1 b. Body of the male, with the basal joint of the antennsie, the mandibles and the 

 trochanteres, from below; x 21. 



Fig. 1 c. Left antenna (of the male), from the outer side ; x 32. 



Fig. 1 d. The two distal joints of the antenna shown in the preceding figure, obliquely from the 

 lower and inner side ; x 32. 



Fig. 1 e. Distal portion of the same antenna ; x ] 00. 



Fig. 1 ./'. Left mandible with its palpus (of the male), from the outer side ; x 32. 



Fig. 1 <j. Middle portion of the anterior half of the body of the male, from below ; x 47. — 

 c. mandible ; d. terminal portion of pars manducatoria of the mandible ; f. angle limiting the 



