168 MORPHOLOGY AND TAXONOMY OF ADULT MALES 



of segment IX being i : 1-4-1-9 (1-7) ; terminal segment pear-shaped. Segments V or VI to 

 X always with a few apically knobbed capitate sensory setae. The following table shows the 

 lengths of the flagellar segments and the number of setae on each : 



III IV V VI VII VIII IX X 



Length in fx 



82-98 



55-73 



49-58 



49-55 



43-52 



40-49 



40-46 



52-61 



(av.) 



(89) 



(64) 



(55) 



(52) 



(49) 



(45) 



(45) 



(58) 



f.s. 



14-19 



11-22 



12-19 



13-18 



12-20 



IO-I7 



6-IO 



i-4 



(av.) 



(17-0) 



(167) 



(15-4) 



(157) 



(14-5) 



(12-7) 



(8-i) 



(2-7) 



h.s. 



9-12 



7-10 



7-10 



7-10 



6-1 1 



6-IO 



4-10 



5-8 



(av.) 



(107) 



(87) 



(8-4) 



(9-1) 



(9-2) 



(8-i) 



(7-i) 



(6-3) 



Setc. ca. 











0-2 



i-3 



1-4 



2-4 



2-5 



3-6 



(av.) 











(0-9) 



(i-5) 



(2-1) 



(2-5) 



(3-o) 



(4-1) 



Antennal bristles stouter and longer than the fleshy setae ; segments VIII and IX each with 

 a ventral bristle. Terminal segment with 3 bristles, the dorsal of which slightly shorter and 

 nearer to the apex ; the segment also with a lateral pair of much smaller bristles and one 

 apical hair-like seta. Jancke (1955) recorded 2 bristles only occurring on the terminal segment. 



Thorax : 517-585 (547) u. long. Prothorax : Comparatively short ; pronotal ridges medially 

 interrupted at a weakly sclerotized point ; lateral pronotal sclerites and post-tergites ill-defined. 

 Proepisternum without any ridge-like sclerotization ; propleural ridge short and propleural 

 apophysis small. Prosternum triangular, 58-76 (67) [x long ; prosternal ridge 92-107 (ioi)(x 

 long, with a small, crescent-like extension antero-medially. Prothoracic setae : Medial 

 pronotal setae usually absent although one seta was found in one specimen ; lateral pronotal, 

 post-tergital and antespiracidar dorsal setae absent. Antespiracular ventral setae always one 

 on each side ; prosternal setae 0-1 (o-8). 



Mesothorax : Prescutum 70-79 (76)^1 long and 131-156 (i43)(x wide (ratio 1 : 1-8-2-0, av. 

 1-9) ; laterally and posteriorly bounded by the prescutal ridges and the prescutal suture 

 respectively. Scutum short and evenly sclerotized ; 40-49 (43) jx long, i.e. the ratio lengths of 

 prescutum to scutum 1-6-1-9 (i*8) : I. Prealare, prealar ridge, triangular plate, tegula, anterior 

 and posterior notal wing processes well developed. Scutellum transverse, rectangular in dorsal 

 view ; 52-61 (58)^ long and 113-140 (i28)fx wide, i.e. the ratios its length to its width 1 : 2-0- 

 2-3 (2-2), and its length to the length of scutum 1-3-1-5 (1-4) : 1 ; the scutellum obliquely 

 transversed on each side by a well developed scutellar ridge dividing it into 3 triangular parts. 

 Anterior and posterior postalar ridges anteriorly joined. Postnotal apophysis strong. Meso- 

 pleuron : Mesopleural ridge continuous above the coxal articulation ; mesopleural apophysis 

 and mesopleural wing process well developed ; basalare slender. Subepisternal ridge distinct. 

 Mesepisternum weakly sclerotized and mesepimeron small ; later opleuvite comparatively large. 

 Mesosternum : Basisternum 125-156 (140) |x long and 168-214 (i8g)(x wide ; marginal, precoxal 

 ridges and furca well developed. Mesothoracic spiracle 21-24 (22) (x wide at opening, with a 

 37-43 (40) |x long supporting bar. Mesothoracic setae on each side : Prescutal setae 1-2 (i-6) ; 

 scutal setae 2-4 (2-9) ; scutellar setae 1-2 (i-i). Tegular setae 4-5 (4-2). Postmesostigmatal 

 and basisternal setae absent. 



Metathorax : Metapostnotal sclerites well defined ; rnetapostnotal ridge absent. Metapleural 

 ridge attenuated towards the small metapleural apophysis and dorsally supporting a small 

 pleural wing process. Metepisternum and metepimeron distinct. Precoxal ridge and metasternal 

 apophysis well developed. Metathoracic spiracle identical with the mesothoracic. Meta- 

 thoracic setae on each side : Metatergal setae always 3, one of which separated submedially ; 

 metapleural setae absent ; anterior metasternal setae 0-2 (i-i) and posterior metasternal setae 

 missing. 



Wings : 868-994 (9 2 4)[x long and 378-434 (406)10. wide ; always with 2 alar setae. Hamulo- 

 halterae 67-76 (73) jx long and 18-21 (19) jx wide ; with one apically hooked, 67-79 (76) [x long 

 seta, i.e. the ratio lengths of seta to hamulohaltera i-o-i-i (1-04) : 1. 



