160 MORPHOLOGY AND TAXONOMY OF ADULT MALES 



of segments III and IX 5-3-7-4 (6-5) : 1 and 3-7-5-1 (4-4) : 1, respectively. In the following 

 table the lengths of the flagellar segments and the number of setae on each are given : 



III IV V VI VII VIII IX X 



length in [o 



128-180 



101-165 



98-168 



92-153 



85-!34 



82-122 



79-110 



85-H6 



(av.) 



(159) 



(137) 



(137) 



(128) 



(116) 



(107) 



(95) 



(98) 



f.s. 



15-21 



1 1-19 



13-21 



1 1-2 1 



12-16 



13-17 



12-14 



IO-I5 



(av.) 



(18-3) 



(14-3) 



(17-5) 



(16-1) 



(14-6) 



(14-3) 



(13-2) 



(I3-0) 



h.s. 



5-8 



i-3 



i-3 



1-2 



1-2 



1-2 



1-2 



1-2 



(av.) 



(7-i) 



(1-6) 



(1-9) 



(1-2) 



(i-3) 



(i-i) 



(1-2) 



(1.4) 



Antennal bristles inconsiderably stouter than the fleshy setae. Segments VIII and IX each 

 with a ventral bristle, about 3i[x long. Segment X with 3 preapical bristles, about 55(1 long 

 and two much shorter ventral ones, about i8[o long, at a greater distance from the segment's 

 apex ; terminal segment also with a preapical sensilla basiconica. Capitate, apically knobbed 

 sensory setae entirely absent. 



Thorax : 532-623 (562)10 long. Pvothorax : Pronotal ridges medially interrupted as usual. 

 Lateral pronotal sclerites and post-tergites well defined. Dorsal and ventral margins of the 

 proepisternum ridge-like. Prosternum represented by a small plate on each side of the median 

 line ; prosternal ridge 107-128 (ii6)jo long. Prothoracic setae on each side : Medial and lateral 

 pronotal setae usually absent, but one seta of each was observed on one side of one specimen ; 

 post-tergital setae 0—2 (0-5) ; antespiracular dorsal setae absent. One antespiracular ventral seta 

 always present ; prosternal setae 0-1 (0-3). Prothoracic disc pores on each side : Medial and 

 lateral pronotal pores 1-3 (averages 1-4 and 2-1, respectively) ; antespiracular dorsal pores 

 absent. Prosternal pores 1-3 (1-7). 



Mesothorax : Prescutum 122-162 (140)}! long and 131-146 (137)^ wide, the ratio being 

 1 : 0-9-1-1 (i-o). Prescutal ridges well developed and continuous medially, replacing the 

 prescutal suture. Scutum comparatively very short and evenly sclerotized ; 21-31 (27)10. long, 

 i.e. the ratio lengths of prescutum to scutum 4-3-6-4 (51) : 1. Prealare, prealar ridge, 

 triangular plate, tegular, anterior and posterior notal wing processes well developed. Scutellum 

 laterally supported by a strong additional ridge ; 85-101 (92)10 long and 131-143 (137) [0 wide, 

 i.e. the ratio length to width 1 : 1-4-1-7 (1-5), and the ratio lengths of scutellum to scutum 30- 

 4-0(3-3) : 1. Postalare with well separated anterior and posterior postalar ridges. Mesopleuron : 

 Mesopleural ridge interrupted above the coxal articulation ; basalare comparatively slender. 

 Mesepisternum and mesepimeron well defined ; later opleurite moderately large, with a distinct 

 oval semi-membranous area. Mesosternum : Basisternum 146-183 (165) \x long and 226-250 

 (235)10 wide ; marginal, precoxal ridges and furca well developed. Mesothoracic spiracle 21-24 

 (23) (x wide at opening, with a 43-49 (46) u. long supporting bar. Mesothoracic setae on each 

 side : Prescutal setae 6-9 (7-2) ; scutal setae 2-4 (2-9) ; scutellar setae 1-2 (i-8). Tegular setae 

 3-6 (4-7). Postmesostigmatal setae 1-3 (1-3) occurring sublaterally. Basisternal setae 8-16 

 (11 -6). Mesothoracic disc pores : Mesospiracular pores 2-4 (2-6) ; postmesostigmatal pores 

 absent. 



Metathorax : Metapostnotal sclerites well defined ; metapostnotal ridge weakly developed. 

 Metapleural ridge attenuated near the middle as usual. Precoxal ridge weakly developed, and 

 metasternal apophysis distinct. Metathoracic spiracle identical with the mesothoracic. Meta- 

 thoracic setae on each side : Metatergal setae 3-4 (3-2) ; metapleural setae 1-2 (i-i). Anterior 

 metasternal setae 0-1 (o-8) ; posterior metasternal setae 0-2 (0-9). Metathoracic pores on each 

 side: Metaspiracular pores 1-2 (1-3) ; anterior metasternal pores 0-2 (1-2) ; posterior metasternal 

 pores 0-1 (0-3). 



Wings : 1400-1610 (1484) jo long and 462-546 (504)^1 wide ; with 2-3 (2-3) alar setae and a 

 compact row of 2-3 (2-2) minute circular sensoria. Hamulohalterae 1 13-122 (ii"9)[o long and 

 21-24 (23) H wide ; with one, 52-61 (55)10. long apically hooked seta, i.e. the ratio lengths of 

 seta to hamulohaltera 1 : 1-9-2-3 (2-2). 



