156 MORPHOLOGY AND TAXONOMY OF ADULT MALES 



long and 31-37 (34)fx wide ; with 8-16 (n - 3) h.s. and a sensillum placodeum. Flagellum : 

 Flagellar segments cylindrical and about 2i;x wide. Segment III longest of all, the ratio its 

 length to the length of segment X 1 -6-2-1 (i-8) : 1, and the ratio width to length of segments 

 III and IX 1 : 5-4-7-1 (6-4) and 1 : 3-6-4-5 (42), respectively. 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 u. 



"6-153 



95-131 



92-119 



76-113 



73-95 



67-85 



70-82 



61-85 



(av.) 



(137) 



(113) 



(107) 



(98) 



(85) 



(76) 



(76) 



(76) 



h.s. 



17-28 



IO-I8 



10-15 



9-14 



9-13 



9-12 



8-15 



12-18 



(av.) 



(22-8) 



(i4-i) 



(12-5) 



(no) 



(107) 



(io-i) 



(n-i) 



(15-6) 



Antennal bristles inconsiderably stouter than the antennal setae and slightly shorter ; 

 segments VIII and IX each with one ventral bristle. Segment X with three preapical bristles 

 and 2-3 preapical sensilla basiconica. Capitate, apically knobbed setae entirely absent. 



Thorax : 388-479 (433) fx long. Prothorax : Pronotal ridges medially interrupted. Lateral 

 pronotal sclerites and post-tergites small. Dorsal and ventral margins of the proepisternum 

 with ridge-like sclerotizations (fig. 31). Prosternum triangular, 24-31 (27) ;x long ; posteriorly 

 supported by the transverse, 82-98 (89) [x long prosternal ridge. Prothoracic setae : Medial 

 pronotal, lateral pronotal, post-lergital and antespiracular dorsal setae all absent ; one ante- 

 spiracular ventral seta always present on each side. Prosternal setae usually absent, but one 

 seta was found on one side of one specimen. Prothoracic pores on each side : Medial pronotal 

 pores 2-4 (3-1) ; lateral pronotal pores 1-2 (1-3) ; antespiracular dorsal pores absent. Prosternal 

 pores usually 1-2, and sometimes absent on one side (av. 11). 



Mesothorax : Prescutum triangular in dorsal view ; 76-98 (85)0. long and 92-119 (104) u. 

 wide, the ratio being 1 : 1-1-1-3 i 1 " 2 )- Presculal ridges continuous postero-medially replacing 

 the prescutal suture. Scutum very short and evenly sclerotized ; 27-46 (37) (x long, i.e. the 

 ratio lengths of prescutum to scutum 2-0-3-2 (2-3) : 1. Prealare, prealar ridge, triangular 

 plate, tegula, anterior and posterior notal wing processes well developed. Scutellum 58-73 (64) jx 

 long and 79-110 (92) jx wide, the ratio being 1 : 1-3-1-5 (1-4), and the ratio its length to the 

 length of scutum 1-4-2-2 (i-8) : 1. Postalare with well separated anterior and posterior postalar 

 ridges. Postnotal apophysis strong. Mesopleuron : Mesopleural ridge interrupted above the 

 coxal articulation ; basalare comparatively slender. M esepisternum and mesepimeron well 

 defined ; later opleurite moderately large. Mesosternum : Basisternum 101-128 (ii6)jx long 

 and 162-198 (180) (x wide ; marginal, precoxal ridges and ) 'urea well developed. Mesothoracic 

 spiracle 21-24 (23) fx wide at opening, with a 37-43 (40) [x long supporting bar. Mesothoracic 

 setae on each side : Prescutal setae usually 2 and occasionally 3 (av. 2-2) ; scutal setae 4-5 (4-5) ; 

 scutellar setae 1-2 (1-3). Tegular setae 1-4 (25). Postmesostigmatal setae 3-5 (3-7) in a latero- 

 ventral group. Basisternal setae 6-8 (7-2). Mesothoracic disc pores on each side ; Meso- 

 spiracular pores 1-2 (i-6) ; postmesostigmatal pores 1-2 (1-2). 



Metathorax : Metapostnotal sclerites distinct and metapostnotal ridge weakly developed. 

 Metapleural ridge attenuating near the middle ; with a small metapleural wing process. Precoxal 

 ridge weak ; metepisternum, metepimeron and metasternal apophysis distinct. Metathoracic 

 spiracle identical with the mesothoracic. Metathoracic setae on each side : Metatergal setae 

 2-3 (2-5) ; metapleural setae 0-1 (o-i). Anterior metasternal setae always one, and posterior 

 metasternal setae 0-2 (0-9). Metathoracic disc pores on each side : Metatergal pores 1-2 (1-3) ; 

 metaspiracular pores 1-2 (i-i). Anterior metasternal pores 1-2 (1-3) and posterior metasternal 

 pores 0-1 (0-4). 



Wings : 1008-1134 (1078) u. long and 378-448 (406) (x wide ; with 2-3 (28) alar setae and a 

 compact row of 2 minute circular sensoria. Hamulohalterae 79-98 (85) (x long and 21-24 (23)^ 

 wide ; with one, 49-55 (52) jx long apically hooked seta, i.e. the ratio lengths of seta to hamulo- 

 haltera 1 : 1-5-1-9 (1-7). 



